i followed this circuit using a 3.3uH inductor, 2.2uF cap, and a 230kHz switching frequency. It works great but the mosfet gets ridiculously hot with and without a load. does anyone know why?
Are you using the recommended MOSFET? A MOSFET is nearly zero resistance when fully off and many Megohms resistance when fully on. It is a near perfect switch. But when not fully on or off it's resistance is anywhere from tens of ohms to Kilohms. This is almost always what heats or overheats FETs and MOSFETs. You must be using a MOSFET that doesn't have triggering as low as the recommended one. Or try a lower value pull down resistor. Another possibility is that the MOSFET has a large gate capacitance and the 555 can not hit it with enough current to turn the gate on and off quickly enough. This leaves it in heating element mode to long each cycle. Good luck. This stuff is hella fun when it works.
When the fet closes the input voltage is essentially shorted to ground. The fet will have max current going through it, or as much as the Vin can supply. You could put a low value resistor in series with the fet to limit the current to whatever the fet is rated for
Hmmmmn.......the meter said 4.4mh [milli-henry] not uh [micro-henry]..if it were 4.4 uh it would read 0.0044 mh on the meter....I have wound many toroids and use the same type of meter on mine....to stay in the micro-henry range I wind around 10 to 20 turns on a toroid core....[BTW I have learned lately that I should only use powdered iron toroids and not ferrite core]....if I am wrong about this I will stand corrected...
Why use a 1N4007 diode? although they make good rectifiers for mains frequencies, there kind of useless at high frequencies, I would go for a UF4007 or a schottky.
Many circuits has different names....but so far in my way to learn I found that the magic of the beautify you say is the Joule Thief in every circuit WHIT the magic of the transistor Amazing,I create a circuit WHIT 4 transistors from Xbox and is amazing how it creat great power WHIT only 3 V ,THANKS FOR SHARE!!!!
Thanks for learning me about this circuit, I played about with it and found that when I used the 10k resistor that pulls the gate of the mosfet to ground well when I used the one I got in my elegoo kit which has 0.6mm legs I got 68volts at the output, if I used the ones from ebay that I got which are 0.4mm legs I could only get 25 volts this was at the stated current of 20milli amps, Also I never had a irfz34 so I used a irfz44 and a 50volt capacitor 22mf at the output is what I used. But to finalise I would never have achieved this if i had not been for learnelectronics help thank you for sharing your knowledge of electronics.
what determines the voltage output? In the video, when you put a 100k resistor as the load you got a steady 29V. So what part of the circuit determines how high the boost converter's voltage will reach?
I'm trying to replicate your circuit and I've noticed that you've indicated the capacitor voltage of 25V, but in the end you've got about 29V of output voltage. I assume that the capacitor should be 50V or above.
Aluminum electrolytic caps will tolerate some over-voltage for a short time, but you should never design for continuous over-voltage. You could use a 35 or 50 volt cap for 29 volts.
I think the constant drone about using microcontrollers is crippling to kids coming up in the hobby or industry. There is a time and place for microcontrollers and a time and place for discretes.
Thats great but I thought i should be able to find one with transistors, but i keep finding ones using discrete IC's like 555 timers and microcontrollers. All these use of IC's are crippling kids comming up in the industry. Just use a 555 timer they say, great, but whats that? Just kidding but you do see complaining about microcontrollers i could be complaining about the use of 555 timers as they dont teach me anything either. That being said micrcocontrollers have these circuits built in, which isnt taught and should be, how to manipulate the CPU's timers to create PWM etc. Thats all microcontollers are, the ability to program these circuits how you want, programmatically, so you dont need a trim pot to set the pwm duty cycle, you can tell memeory to store that information and use it when need be. Change it at different times. Its all just electric circuit with MCU's , just more convenient and powerful. With how cheap MCU's can be, sometimes i fail to see the reason to get a discrete ic that needs extra circuitry to power up. That being said its nice to know how these things are done with discrete components, so you can just build what you need and not the extra's IC's give you and I found a video like that - th-cam.com/video/CcMiGZUzITo/w-d-xo.htmlsi=28xFSx4_mfSv4DEr Simlest PWM generator using no microcontroller nor 555 timers, just transistors.
Actually had diode reverse biased! 😂 Got 34 volts from nine volt battery but mosfet got really hot! Think I either need bring down the inductance or attach heat sink or both? Thank you again for video!!
You are not connecting the load to ground! You are just measuring the potential after the resistor referenced to the ground, but there's no current flowing to the resistor because it's NOT CONNECTED TO GROUND, the multimeter has high resistance between its probes!! You are not loading that circuit a tiny bit!
When he puts the resistor load, he puts it in series, which means he has the resistance of the resistor summed up with the resistance of the multimeter which is really high, so his voltage is not really affected by this load. If you would put the load to the ground, and be that a small resistor 100Ohm, this circuit will most likely drop in voltage significantly. Don't try to reinvent the wheel, just buy it from ebay, they are much more stable than anything you can build at home.
I want to use one of these to charge a lithium ion battery, my source voltage is 13v and I need 16.8v to charge the battery at about 15A, how would I calculate the components required?
It is a fundamental property of an inductor that you cannot instantaneously change the current through it. When the switch is closed you store energy in the inductor as a magnetic field. If the current in the inductor were zero at the time the switch closed the current would start to rise linearly with respect to time. The magnitude of current if would reach is directly proportional to the time and to the voltage. Let's say that it reached 1 ampere. At the instant the switch opens, that current will still be 1 ampere. The voltage across the inductor will essentially instantaneously rise to whatever it needs to be to make that current flow. It doesn't matter if the voltage across the inductor at that instant can only be 10 millivolts or 200 volts, it will make 1 ampere flow. That's how you get the high output voltage. A switchmode power supply is a _power_ converter. If you want 10 watts out, you must put 10 watts in, assuming 100% efficiency. With a boost converter the output voltage is higher than the input voltage. If you had a 10 volt input supply you'd take 1 ampere from it for the 10 watts. You could take the output at 100 volts and 0.1 amps or at 20 volts at 0.5 amps. How you actually do this in a real circuit is by controlling how much time the inductor is charging versus how much time it is discharging. Usually this is done by controlling the duty cycle with fixed frequency. In a boost converter the discharge is much faster than the charge because the voltage across the inductor is larger. di/dt = V/L the rate of change of current in an inductor is equal to the voltage across the inductor divided by the inductance i is in amperes, t is in seconds, V is in volts and L is in henries
I could never wind an inductor that fast and the value was in millihenries, not as you said microhenries How much current can i source from this circuit?
Good tutorial I guess it was mH on the meter. why not elaborate a little more and regulate the output voltage by varying the pulse width on the 555 timer. Perhaps some feedback will suit perfectly. Have you an idea how to make a boost converter with a double output of + and - 12v charged from a single lithium battery of 3.7v?
Thanks for making this. How much is the current output reduced when doing this? Also, is it possible to create dangerous voltage/current at the load if you're driving it with, say, a 12V battery?
Look at the videos demonstrating how to configure a 555 in astable mode. Then notice that pin 3, the output pin, is hooked to the gate of the MOSFET. As the square wave generated goes high and low, the MOSFET opens and closes.
Optoisolator, and yes, you can also look up a pot to the analog input and feedback to another analog input through a voltage divider if you know you're not going to exceed the ratings of your Arduino.
There is no feedback in this circuit ,hence the output current and Voltage are not constant. Bigger Load Will drop the output current and Voltage. Knowing about the Power,you can determine Volts and Amperes.
Really...really excellent video. I cannot thank you enough for making your knowledge available to newbies like me. Extra credit for the old school video game transition music. You just got may subscription.
I'm doing this later today I've seen some hook up the mosfet or bjt yo the inductor to control the mosfet. Theres no micro vonttoler as far as I can tell . I don't get how its being controlled without some sort of micro controler. What determines the maximum output of the boost converter. Is it the mosfet switching speed or the inductor
very educational. With your knowledge I was wondering if you could help me. I bought 5v to 12v stepup board with only 8watts max. Need it to drive 12v 1ah 10w. Will 2 board in parallel works?will (12v 2ah 16w) hurt (12v 1ah 10w)
Hi, L/E,I hope you have just solved my problem. Trying to run a 10watt LED off this curcuit which I belie e requires max of 24 volts..Now, Running it at a slightly lower wattage to about 8watts,less strain on the LED,I hope it should last longer..The Project is::::: To catch a rat in the garden that is constantly making holes under the fence..Probably in the dark...hmmmm..If I know he is there, I can despatch him .... Hoping you can give me a little more information on the amount of wire turns,and check the said curcuit,as it is roughly the same as yours..As said it will be to turn on a 10w LED,,, THE CURCUIT Will not be on allthe time as I want to fit a n IR Sensor to it..Any asstance would be a great hep..Thank You.
This is the best boost converter video!!!! But i was trying to do 24v to 500v with the limited of output current 5mA, so can u give me some advice please!!!!!
I tried to design boost converter with switching frequency 1kHz and inductor 4.5 mH but when circuit get on it boost voltage from 15v to 50v but then after it continues to decrease until it fall down to almost half of input voltage
Was that load resistor in series with the meter? That's not a load, that's current limiting to the meter. Lol I might be wrong but can someone confirm this?
Whats the business with this 555 chip of yours? Without that information this video is pretty useless. ... but thanks that you took the time to show us how you switch off your worklights, pffffft. I guess it's an american thing....
really Helpful video simple circuit 😊.I am using the TL 494 ic for boost converter that's not pretty working.I tried this ckt result is Fair for me thank you sir....
i was extremely interested in your inductor and im sorry to say you did not show how you built it in detail would you do a video on how you did it. im familiar with the process but would like to see it done slowly with detail,
Hi, very grateful explanation,but there was no IC and some other capacitor in circute diagram.later you used IC and other eliments on pc board.we can't build this circuit with out IC and other eliments? Can we make this only what ever in the circuit diagram ??
I get you. You can build this circuit without the 555.. And without the mofet if you can push a switch a few hundred times a second. The basics are that a switch (MOSFET) is fast and this turns on and off, to get the build up in the coil. There are many ways to make the switch, a 555 is easy and has two ((asynchronous switching)), which isn't needed, there are MOSFET drivers, bjt's And if you don't have a IC you can make a charge switch using resistors and capacitors to the gate on the FET. That works by building a charge in a capacitor which has to pass a resistor when it builds and then reaches the gate and is discharged, this charge and discharge will occur in ms, and youll will have to add this to drive the switch which will change the voltage. Make one resistor variable and you can change the voltage. You also need to add a fly back which would be the other half.
Sorry to post a question on an old vid but I was under the impression that a pull down resistor was not needed when driving with a 555 because the 555 output goes to ground when not high. If I reverse an LED across the output of pin 3 it lights every time the pin is low and turns off when the pin goes high. So how is the 555 LOW different from ground? Is it not quite rail to rail, so to speak?
Which pin are you talking about? Pin 3? That's going to gate of the MOSFET. Maybe I need to rewatch the video, but it looked fine to me. Edit: OK, I'm looking at 3:45, and now I see what you're talking about. There's a wire there though, not a resistor, and that's why I was confused. My best guess is that it's a leftover from when Paul was testing the timer, needed to sink the signal on the OUTPUT pin, but forgot to remove it before tying it to the gate of the MOSFET.
Does a boost converter follow the same current ratio calculations as old fashioned voltage multipliers? Current being inversely proportional to voltage. I.E 10V 1A to 20V .5A minus parasitic loss?
Use a voltage Divider at output followed by an Opamp( As a Comparator) which is connected to an Microcontroller or Any IC . The Microcontroller will increase or Decrease the PWM signal Duty cycle Based on the Requirements of load for a stable Output.
Thank you for your very good training I had two questions: 1) Is it possible to use another power transistor instead of MOSFET, such as 13005 or TIP41C, etc.? 2) Explain the reason for using 10k resistor once again? Does It work without resistance in this section? Because I made another example with a three-ended coil and TIP41C and got the result, but with the two-ended coil and injecting the signal to the Base or Gate base, no result was obtained. Of course, I did not connect a 10k resistor to them. Thank you very much.
Resistor is there to pull the gate to 0v. Mosfet will still be on even after removing gate voltage,so you need to tie gate to ground through resistor to turn it off. In your case,without the resistor connecting gate to the ground,the MOSFET is always on and no pusle is generated.
In years gone by switchers were made with bipolar junction transistors. However, very fast switching is important for good efficiency and though you have to swing quite a bit of gate current into and out of a power MOSFET gate to get it to switch if fast, they do switch very fast and can handle some things that kill BJTs. BJTs often need quite elaborate "snubber" circuits to protect them (a boost converter is more or lesss "self snubbing"). The MJ1300x types were fairly popular for switchers operating at moderate frequency (20 to 40 kHz, typically).
dwpetty3723 if you want to change the output voltage you would need to change either the inductor value or the switching frequency. the resistor at the end of the circuit just stabilizes the output. thanks for the compliment.
It depends on wattage. It can't produce extra wattage out from no where. You said 12v and 150mA, but how much exactly this 12v supply can deliver of amperage. If we say that this is 12v 2A supply, so the input wattage is 24W (12*2). In this case the boost voltage can't give power more than 24W (if we considered efficiency is 100%). So with 24W input and you boost your voltage to for example 48v, it will only capable of delivering 0.5A (48*0.5=24W) if not lesser.
You need to check for the inductance of the inductor used more the inductance higher the voltage can get and frequency of the oscillator is also proportional to the voltage output also use an appropriate capacitor at the end for smooth output voltage . By the way this is not the circuit for high voltage output this one is nice if you want to drive 20volts load from 5volts battery but if you want something to play with having 500volts output build something with appropriate transformer not with a inductor circuit like this because the high voltage peaks can damage your battery but in case of transformer based circuit your battery is safe .... : ) ignore typing mistakes if you find some
How much control in volts Does the 50 k pott have in range. and at mosfet left side your using a resistor ? right side straight to ground bar not sure why great show today im trying to build my now spinning my magnet wire now fun fun
Hello dear. I am noureddine from morocco. I'm really interested by your boost converter. but unfortunately I don't have the means to realize it. is what you can send me these essential components to achieve this boost converter?
learnelectronics is it necessary to connect timmer? I saw in some other video they didn't connect the timmer? Sorry for disturbing you but i want to make this
i followed this circuit using a 3.3uH inductor, 2.2uF cap, and a 230kHz switching frequency. It works great but the mosfet gets ridiculously hot with and without a load. does anyone know why?
Are you using the recommended MOSFET? A MOSFET is nearly zero resistance when fully off and many Megohms resistance when fully on. It is a near perfect switch. But when not fully on or off it's resistance is anywhere from tens of ohms to Kilohms. This is almost always what heats or overheats FETs and MOSFETs. You must be using a MOSFET that doesn't have triggering as low as the recommended one. Or try a lower value pull down resistor. Another possibility is that the MOSFET has a large gate capacitance and the 555 can not hit it with enough current to turn the gate on and off quickly enough. This leaves it in heating element mode to long each cycle. Good luck. This stuff is hella fun when it works.
When the fet closes the input voltage is essentially shorted to ground. The fet will have max current going through it, or as much as the Vin can supply. You could put a low value resistor in series with the fet to limit the current to whatever the fet is rated for
Hmmmmn.......the meter said 4.4mh [milli-henry] not uh [micro-henry]..if it were 4.4 uh it would read 0.0044 mh on the meter....I have wound many toroids and use the same type of meter on mine....to stay in the micro-henry range I wind around 10 to 20 turns on a toroid core....[BTW I have learned lately that I should only use powdered iron toroids and not ferrite core]....if I am wrong about this I will stand corrected...
Why use a 1N4007 diode? although they make good rectifiers for mains frequencies, there kind of useless at high frequencies, I would go for a UF4007 or a schottky.
Do you know an alternative for a nce85h21tc mosfet?
Exactly
Many circuits has different names....but so far in my way to learn I found that the magic of the beautify you say is the Joule Thief in every circuit WHIT the magic of the transistor Amazing,I create a circuit WHIT 4 transistors from Xbox and is amazing how it creat great power WHIT only 3 V ,THANKS FOR SHARE!!!!
I ended up getting a good 34 - 35 v , When i finished my inductor i got 5 ohms and 18.74 mh and im puting in 5v in to my converter
Thanks for learning me about this circuit, I played about with it and found that when I used the 10k resistor that pulls the gate of the mosfet to ground well when I used the one I got in my elegoo kit which has 0.6mm legs I got 68volts at the output, if I used the ones from ebay that I got which are 0.4mm legs I could only get 25 volts this was at the stated current of 20milli amps, Also I never had a irfz34 so I used a irfz44 and a 50volt capacitor 22mf at the output is what I used. But to finalise I would never have achieved this if i had not been for learnelectronics help thank you for sharing your knowledge of electronics.
what determines the voltage output? In the video, when you put a 100k resistor as the load you got a steady 29V. So what part of the circuit determines how high the boost converter's voltage will reach?
I'm trying to replicate your circuit and I've noticed that you've indicated the capacitor voltage of 25V, but in the end you've got about 29V of output voltage. I assume that the capacitor should be 50V or above.
Aluminum electrolytic caps will tolerate some over-voltage for a short time, but you should never design for continuous over-voltage. You could use a 35 or 50 volt cap for 29 volts.
Man, this is great. I thought I should be able to build one with a 555 but the tutorials I keep finding use micros. Thanks for the video.
I think the constant drone about using microcontrollers is crippling to kids coming up in the hobby or industry. There is a time and place for microcontrollers and a time and place for discretes.
Thats great but I thought i should be able to find one with transistors, but i keep finding ones using discrete IC's like 555 timers and microcontrollers. All these use of IC's are crippling kids comming up in the industry. Just use a 555 timer they say, great, but whats that? Just kidding but you do see complaining about microcontrollers i could be complaining about the use of 555 timers as they dont teach me anything either. That being said micrcocontrollers have these circuits built in, which isnt taught and should be, how to manipulate the CPU's timers to create PWM etc. Thats all microcontollers are, the ability to program these circuits how you want, programmatically, so you dont need a trim pot to set the pwm duty cycle, you can tell memeory to store that information and use it when need be. Change it at different times. Its all just electric circuit with MCU's , just more convenient and powerful. With how cheap MCU's can be, sometimes i fail to see the reason to get a discrete ic that needs extra circuitry to power up. That being said its nice to know how these things are done with discrete components, so you can just build what you need and not the extra's IC's give you and I found a video like that - th-cam.com/video/CcMiGZUzITo/w-d-xo.htmlsi=28xFSx4_mfSv4DEr Simlest PWM generator using no microcontroller nor 555 timers, just transistors.
Don't connect the load to series...
How high would it climb with no load . Could it blow the capacitor?
use a high voltage capacitor
@@big_o1952 ok
I am looking for video that explains how to integrate the 555 timer and the pot to adjust the output voltage and current.
What was the current out put? And yes I'm gonna build one great video
Actually had diode reverse biased! 😂 Got 34 volts from nine volt battery but mosfet got really hot! Think I either need bring down the inductance or attach heat sink or both? Thank you again for video!!
You are not connecting the load to ground! You are just measuring the potential after the resistor referenced to the ground, but there's no current flowing to the resistor because it's NOT CONNECTED TO GROUND, the multimeter has high resistance between its probes!! You are not loading that circuit a tiny bit!
Have you tried to recreate this circuit to test your theory?
When he puts the resistor load, he puts it in series, which means he has the resistance of the resistor summed up with the resistance of the multimeter which is really high, so his voltage is not really affected by this load. If you would put the load to the ground, and be that a small resistor 100Ohm, this circuit will most likely drop in voltage significantly. Don't try to reinvent the wheel, just buy it from ebay, they are much more stable than anything you can build at home.
@@MitkoNikov dude you are right that's why he got low output current 👍
Milihenrys not micro
I want to use one of these to charge a lithium ion battery, my source voltage is 13v and I need 16.8v to charge the battery at about 15A, how would I calculate the components required?
I think it was mH for milli henry not micro : )
Yep..I think so too....it was about 5 mili Henry
Will you please tell us that how can we make it by multiples output connected simountesly
im confused. 5 volts from the supply plus 5 volts from the inductor equals 10 volts. where does the extra voltage come from?
It is a fundamental property of an inductor that you cannot instantaneously change the current through it.
When the switch is closed you store energy in the inductor as a magnetic field. If the current in the inductor were zero at the time the switch closed the current would start to rise linearly with respect to time. The magnitude of current if would reach is directly proportional to the time and to the voltage. Let's say that it reached 1 ampere.
At the instant the switch opens, that current will still be 1 ampere. The voltage across the inductor will essentially instantaneously rise to whatever it needs to be to make that current flow. It doesn't matter if the voltage across the inductor at that instant can only be 10 millivolts or 200 volts, it will make 1 ampere flow. That's how you get the high output voltage.
A switchmode power supply is a _power_ converter. If you want 10 watts out, you must put 10 watts in, assuming 100% efficiency. With a boost converter the output voltage is higher than the input voltage. If you had a 10 volt input supply you'd take 1 ampere from it for the 10 watts. You could take the output at 100 volts and 0.1 amps or at 20 volts at 0.5 amps. How you actually do this in a real circuit is by controlling how much time the inductor is charging versus how much time it is discharging. Usually this is done by controlling the duty cycle with fixed frequency. In a boost converter the discharge is much faster than the charge because the voltage across the inductor is larger.
di/dt = V/L
the rate of change of current in an inductor is equal to the voltage across the inductor divided by the inductance
i is in amperes, t is in seconds, V is in volts and L is in henries
Right on!
Aren't you using a 25V electro cap on the output? 29V will kill it.
Great circuit. Thanks. I'm getting 19v from a 5v supply. Not as good as some of your watchers but I'm chuffed.
Take care dude.👍😷
Sir please is that good to power in a satelite receiver with a 7 inch tft screen? Meaning the result wanted is 12 v 3 amperes.
I think 0.02A is 20 milli Amps not 2 milli Amps
Deepak khatri yes, of course
I could never wind an inductor that fast and the value was in millihenries, not as you said microhenries How much current can i source from this circuit?
Thanks for posting this! How could one control the amperage put out by a boost converter?
Exactly my question too!
Your hands look like the kind that if they were ever swung at someone in anger, would likely result in you being judged by a jury of your peers. ;)
what does the circuit tester do? do videos on them simple things are important for newbies
How to model a closed loop hardware of boost converter?
what is the thing in the glass case that seems to have power hooked up to it?
That was the BEST explanation I have ever heard out of hundreds of you tube videos I've searched. Thank you
thumb up ... very2 nice explanation, sir
+TheJavaSync thanks
20mA
Good tutorial I guess it was mH on the meter. why not elaborate a little more and regulate the output voltage by varying the pulse width on the 555 timer. Perhaps some feedback will suit perfectly. Have you an idea how to make a boost converter with a double output of + and - 12v charged from a single lithium battery of 3.7v?
can you use a bjt instead of mostef in a boost converter
Thanks for making this. How much is the current output reduced when doing this? Also, is it possible to create dangerous voltage/current at the load if you're driving it with, say, a 12V battery?
How does the 555 timer is used in the sketch....show it how it is connected to the diagram...
Look at the videos demonstrating how to configure a 555 in astable mode. Then notice that pin 3, the output pin, is hooked to the gate of the MOSFET. As the square wave generated goes high and low, the MOSFET opens and closes.
You eat something or what 😂😂😂
What about a high current 3.7 to 48v, 400a boost converter?
Huh
can you make a boost converter with arduino PWM and an octoisolator..so that we can safely control the voltage digitally through serial port
VibeX MaTxeMa you can (it's what i am doing) just be carefull to not fry your arduino :)
Optoisolator, and yes, you can also look up a pot to the analog input and feedback to another analog input through a voltage divider if you know you're not going to exceed the ratings of your Arduino.
Optoisolator isn't really necessary
If we have 12V and 1Amp(fixed maximum) and we boost it to 48V then what maximum Amps we will get from 48 volts?
There is no feedback in this circuit ,hence the output current and Voltage are not constant.
Bigger Load Will drop the output current and Voltage.
Knowing about the Power,you can determine Volts and Amperes.
12V at 1 amp is 12 watts. That's 0.25 amps at 48V.
100k resistance lol shud of switched to amps lol
Don't worry, everybody here will sooner or later connect a real load to their converters. And then they will lol also:)
Really...really excellent video. I cannot thank you enough for making your knowledge available to newbies like me. Extra credit for the old school video game transition music. You just got may subscription.
Thanks RK. Much appreciated and welcome aboard.
very help full, thanks
Hi Paul nice , good clear instruction good views on the layout on the breadboard .I put a larger inductor and cap got 60V out thanks
60V nice!
I'm doing this later today I've seen some hook up the mosfet or bjt yo the inductor to control the mosfet. Theres no micro vonttoler as far as I can tell . I don't get how its being controlled without some sort of micro controler. What determines the maximum output of the boost converter. Is it the mosfet switching speed or the inductor
very educational. With your knowledge I was wondering if you could help me. I bought 5v to 12v stepup board with only 8watts max. Need it to drive 12v 1ah 10w. Will 2 board in parallel works?will (12v 2ah 16w) hurt (12v 1ah 10w)
Hi, L/E,I hope you have just solved my problem. Trying to run a 10watt LED off this curcuit which I belie e requires max of 24 volts..Now, Running it at a slightly lower wattage to about 8watts,less strain on the LED,I hope it should last longer..The Project is::::: To catch a rat in the garden that is constantly making holes under the fence..Probably in the dark...hmmmm..If I know he is there, I can despatch him .... Hoping you can give me a little more information on the amount of wire turns,and check the said curcuit,as it is roughly the same as yours..As said it will be to turn on a 10w LED,,, THE CURCUIT Will not be on allthe time as I want to fit a n IR Sensor to it..Any asstance would be a great hep..Thank You.
This is the best boost converter video!!!! But i was trying to do 24v to 500v with the limited of output current 5mA, so can u give me some advice please!!!!!
it can't power up a 4v led smd led ..four in series..voltage dropping from 12v-3.5.. something...help what can I do
dope, thanks! What material did you use for the coil center? Ceramic?
very nifty sir!
I tried to design boost converter with switching frequency 1kHz and inductor 4.5 mH but when circuit get on it boost voltage from 15v to 50v but then after it continues to decrease until it fall down to almost half of input voltage
Was that load resistor in series with the meter? That's not a load, that's current limiting to the meter. Lol I might be wrong but can someone confirm this?
Whats the business with this 555 chip of yours? Without that information this video is pretty useless. ... but thanks that you took the time to show us how you switch off your worklights, pffffft. I guess it's an american thing....
Yes, we do our best work in the dark.
555 Very fast switching trigger for the Mosfet - 555 is a timer IC
What is the model of the mosfet?
Irf2907l
input side current 20 mA and voltage 5 v . But out side voltage and current and watt ...how much
please explain..
Is there a way to use this circuit to get 5V and 5mA from a Vin of 1.5V or 3V from a standard AA batteries?
really Helpful video simple circuit 😊.I am using the TL 494 ic for boost converter that's not pretty working.I tried this ckt result is Fair for me thank you sir....
current depends on what?
Voltage divided by resistance
I don’t understand 50k parts.please can you clear this
Thanks.
Want design of 12 to 48 750 watts boost converter
i was extremely interested in your inductor and im sorry to say you did not show how you built it in detail would you do a video on how you did it. im familiar with the process but would like to see it done slowly with detail,
Does anyone know an alternative for a nce85h21tc mosfet?
Can input voltage be low as 3v to 4v?
Yes
Where did you get that 5v box thing on the left of the video ? I kind of like that
Hi, very grateful explanation,but there was no IC and some other capacitor in circute diagram.later you used IC and other eliments on pc board.we can't build this circuit with out IC and other eliments?
Can we make this only what ever in the circuit diagram ??
I get you.
You can build this circuit without the 555..
And without the mofet if you can push a switch a few hundred times a second.
The basics are that a switch (MOSFET) is fast and this turns on and off, to get the build up in the coil.
There are many ways to make the switch, a 555 is easy and has two ((asynchronous switching)), which isn't needed, there are MOSFET drivers, bjt's
And if you don't have a IC you can make a charge switch using resistors and capacitors to the gate on the FET.
That works by building a charge in a capacitor which has to pass a resistor when it builds and then reaches the gate and is discharged, this charge and discharge will occur in ms, and youll will have to add this to drive the switch which will change the voltage. Make one resistor variable and you can change the voltage.
You also need to add a fly back which would be the other half.
Thank you very much.i understand.
Sorry to post a question on an old vid but I was under the impression that a pull down resistor was not needed when driving with a 555 because the 555 output goes to ground when not high. If I reverse an LED across the output of pin 3 it lights every time the pin is low and turns off when the pin goes high. So how is the 555 LOW different from ground? Is it not quite rail to rail, so to speak?
Which pin are you talking about? Pin 3? That's going to gate of the MOSFET. Maybe I need to rewatch the video, but it looked fine to me.
Edit: OK, I'm looking at 3:45, and now I see what you're talking about. There's a wire there though, not a resistor, and that's why I was confused. My best guess is that it's a leftover from when Paul was testing the timer, needed to sink the signal on the OUTPUT pin, but forgot to remove it before tying it to the gate of the MOSFET.
You are correct, the 10k resistor is superfluous since the 555 will pull the output both high and low.
Does a boost converter follow the same current ratio calculations as old fashioned voltage multipliers? Current being inversely proportional to voltage. I.E 10V 1A to 20V .5A minus parasitic loss?
No. A boost converter is simply a switch mode power supply. So it follows those conventions.
Was wondering if current loss needed to be factored in when using a buck converter. Thanks
i have a huuuge inductor from an old audio frequency splitter. i will build one with that ;)
There ya go! I want to hear about the results
vry nice, i would lik to stepup 12vdc - 48vdc how would i do that im kinda new at this, thank you
Use the same setup but with a 48v capacitor.
Keep getting 0.01 V across load???
Can you tell me how to add a feedback circuit at it for sudden change in load pls pls pls..
Btw i am a fan of your work .
Love frome india .
Use a voltage Divider at output followed by an Opamp( As a Comparator) which is connected to an Microcontroller or Any IC .
The Microcontroller will increase or Decrease the PWM signal Duty cycle Based on the Requirements of load for a stable Output.
It's a beautiful thing. And you did great. Thanks :-)
is it really necessary to meet the threshold voltage of the mosfet
Making that now..in the Lockdown..
Are there any equations so I can design a boost circuit for an exact output voltage given an exact input voltage?
I remember good book i think its . Power electronics Hart
Thank you for your very good training
I had two questions:
1) Is it possible to use another power transistor instead of MOSFET, such as 13005 or TIP41C, etc.?
2) Explain the reason for using 10k resistor once again? Does It work without resistance in this section?
Because I made another example with a three-ended coil and TIP41C and got the result, but with the two-ended coil and injecting the signal to the Base or Gate base, no result was obtained. Of course, I did not connect a 10k resistor to them. Thank you very much.
Resistor is there to pull the gate to 0v.
Mosfet will still be on even after removing gate voltage,so you need to tie gate to ground through resistor to turn it off.
In your case,without the resistor connecting gate to the ground,the MOSFET is always on and no pusle is generated.
@@naingtheawperc3817 Yes, but in this case the 555 timer square wave will pull it both high and low, so really it is not necessary.
In years gone by switchers were made with bipolar junction transistors. However, very fast switching is important for good efficiency and though you have to swing quite a bit of gate current into and out of a power MOSFET gate to get it to switch if fast, they do switch very fast and can handle some things that kill BJTs. BJTs often need quite elaborate "snubber" circuits to protect them (a boost converter is more or lesss "self snubbing"). The MJ1300x types were fairly popular for switchers operating at moderate frequency (20 to 40 kHz, typically).
Great video and fun! Thanks for the work!
20mA not 2mA
so to get a steady output to like 20v, you would just change the resistor value? great video
dwpetty3723 if you want to change the output voltage you would need to change either the inductor value or the switching frequency. the resistor at the end of the circuit just stabilizes the output. thanks for the compliment.
what is the value of the resistor?
please give scheme of circuit on the bredboard
sova713 i.stack.imgur.com/7uveJ.png
PS:: It will be run from a i9volt battery...hmm m.
Yes
Question: how much amp can this circuit supply?
about an amp
Well say Ian supplying it with 12v and 150ma, will it still give me an amp and atleast 12v?
It depends on wattage. It can't produce extra wattage out from no where. You said 12v and 150mA, but how much exactly this 12v supply can deliver of amperage. If we say that this is 12v 2A supply, so the input wattage is 24W (12*2). In this case the boost voltage can't give power more than 24W (if we considered efficiency is 100%). So with 24W input and you boost your voltage to for example 48v, it will only capable of delivering 0.5A (48*0.5=24W) if not lesser.
What should i do to get voltage upto 500volts?
Get a capacitor that big...
You need to check for the inductance of the inductor used more the inductance higher the voltage can get and frequency of the oscillator is also proportional to the voltage output also use an appropriate capacitor at the end for smooth output voltage . By the way this is not the circuit for high voltage output this one is nice if you want to drive 20volts load from 5volts battery but if you want something to play with having 500volts output build something with appropriate transformer not with a inductor circuit like this because the high voltage peaks can damage your battery but in case of transformer based circuit your battery is safe .... : ) ignore typing mistakes if you find some
foolish circuit.......no circuit idea
سلام عليك +++++++ جزاك الله خيرا
Hicham Bougaa 👀
he said may god bless you
Did u just create a free energy source lol. If the cap keeps charging with no primary voltage supply? Lol.
good afternoon sir it's my please to watch such practical design videos. if possible please share the circuit diagram
How much control in volts Does the 50 k pott have in range. and at mosfet left side your using a resistor ? right side straight to ground bar not sure why great show today im trying to build my now spinning my magnet wire now fun fun
Any1 plz reply
Can you post the schematics bud.
Can someone help me with the full diagram of this circuit ?? Please
Hello dear.
I am noureddine from morocco. I'm really interested by your boost converter. but unfortunately I don't have the means to realize it. is what you can send me these essential components to achieve this boost converter?
Buy them....
Which is the timmer used?
Kshitij Patil ne555
learnelectronics is it necessary to connect timmer? I saw in some other video they didn't connect the timmer? Sorry for disturbing you but i want to make this
don't not scematic
How much load it can take I want nearly 2amps of current
Not much
Makin your own electricity, I like it!
Ne