Hi Jason, cool circuit/video this! Didn't know it could be that simple since I am trying for half a year to get something like this with a 555 timer which still did not succeed. Like your educational vids man!
There is a way of calculating the frequency of an astable circuit using a chart called a nomograph and cannot find any explanation of how to do this and would love to see a video with a step by step explanation of how to use this chart.
Just asking for a friend... If I where to drive a circuit (MOSFET) for an induction heater (ca. 500 W - 2k W) which would you use: (1) a 555 IC (astable), (2) or this type of multivibrator? Merci de votre réponse. (NB. The IH circuit will have variable duty and frequency to accommodate changing the work coil and its LC tank: range 30-80 %/20-100 kHz). My newbie amateur elctr. friend has been working on this proj. for the past 6 monts thinking only in 555 or ZVS terms and just realized what is a BJT 'multi vibration circuit). Moreover, He as seen several circuits using BJT's in conjunction with 555 IC's to drive the IH's MOSFETS. Ho! by the way ... nice work for it all.
Hi Jason, Just wondering if you’ve checked out the data sheets for the TLC555 and the HA17555. They are supposedly more accurate than a standard NE555.
I have not, however most of my applications don't require high precision. I'll grab just about anything that has the "555" label on it. Thanks for the heads up though. I'll check it out. Might make for an interesting lab demonstration.
Hi I built up this oscillator and it works fine but this formula doesn't hold and R1 and R4 should be also included in the formula because changing their value changes the oscillator output frequency
This guy is so cool, i hope he's doing well in 2023
Great explanation, also glad to see you posting again. I enjoy your teaching style so I learn a lot from your videos.
Thanks Mike!
Nice video and teaching style 👍
Do you know if there's a way to vary the duty cycle externally by a control voltage?
That's kind of like a heartbeat! Thanks for the video!
Can you make a detailed video on how you can,
adjusting frequency without changing the duty cycle in astable mode with ne555
Hi Jason, cool circuit/video this! Didn't know it could be that simple since I am trying for half a year to get something like this with a 555 timer which still did not succeed. Like your educational vids man!
Thanks. Glad it was helpful!
Is it possible to change the duty cycle with a reference voltage without an integrated circuit or micro-controller?
If the two LEDs are replaced by two 3v DC motors, will the motors spin alternately? Thanks.
where i see the 555 timer i remember you, thanks a lot :D
Hi shats the lowest voltage the astable will run at?.....i will be using coils in place of the leds, so will not need to light those....cheers
Hello Skinny R&D, Could you please refresh my memory where the 0.69 in the formula for t1=0.69C1R1 comes from? Could it be from PI?
There is a way of calculating the frequency of an astable circuit using a chart called a nomograph and cannot find any explanation of how to do this and would love to see a video with a step by step explanation of how to use this chart.
Just asking for a friend... If I where to drive a circuit (MOSFET) for an induction heater (ca. 500 W - 2k W) which would you use: (1) a 555 IC (astable), (2) or this type of multivibrator? Merci de votre réponse. (NB. The IH circuit will have variable duty and frequency to accommodate changing the work coil and its LC tank: range 30-80 %/20-100 kHz). My newbie amateur elctr. friend has been working on this proj. for the past 6 monts thinking only in 555 or ZVS terms and just realized what is a BJT 'multi vibration circuit). Moreover, He as seen several circuits using BJT's in conjunction with 555 IC's to drive the IH's MOSFETS. Ho! by the way ... nice work for it all.
Is it ok if the capacitors are non electrolytic... How do i contact you...
Hi Jason,
Just wondering if you’ve checked out the data sheets for the TLC555 and the HA17555. They are supposedly more accurate than a standard NE555.
I have not, however most of my applications don't require high precision. I'll grab just about anything that has the "555" label on it. Thanks for the heads up though. I'll check it out. Might make for an interesting lab demonstration.
Hi
I built up this oscillator and it works fine but this formula doesn't hold and R1 and R4 should be also included in the formula because changing their value changes the oscillator output frequency
Show a circuit to drive a mosfet. With multi vibrator driving get.
How u can calculate the colector curent of a desired saturation
You are missing the capacitor polarization
Not in this case. I used capacitors that were not eletrolytic. They are not polarity sensitive.