Hi Hesam. Thanks for this design and the video. Please allow me to draw your attention to a small error over on the very helpful PCBWay article for this design. Where you see this text, 'R3, C4, and D1 build a snubber circuit to suppress transient spikes of the transformer', I think D1 should be D2. Thanks and regards, Rick.
Hi Rick, Yes, Thank you. D1 is output, and D2 is correct. Typo mistakes or some small errors could happen because of tiredness. Content-making is a difficult process. Thank you that you read the article and watch the video completely
Hello my friend. Can you share with me the Gerber Files for this board, I like you design very much and I have a project I am working on which this exact requirements. BTW, we also use PCBWay.
when I see somebody doesn't watch the content completely, it's a big turn off, because I mentioned where you can get more details including Gerber, fabricated board, … etc.
Hey bro I really liked the way you taught everything crisp and clear. Can you plz also share to increase current rating to 2A and add multiple outputs to this pcb.
The chip's power is limited to 18W, so 2A for 12V is impossible. I was expecting that you invest time, watch the video completely, and read the article. I will publish another one with 2 outputs in the near future
@@MyVanitar i'm a college student and i wanted it for my for my project this semester, just having a trouble adjusting output voltage and current and controlling them separately . sadly i can't afford a project but i would really appreciate any tip you can provide .
I have a 12V-7A version on my channel. check the details for your info. The output of these supplies is not that much adjustable except you use a buck converter at the output
it depends on your LCR meter, some of them are manual and you decide the range, so you put the selector on the range to measure your inductor. if you have to enter the frequency, you must check other parameters such as the angle to check if your selected frequency is good.
I wonder how you set the flyback voltage in the transformer design. I can't calculate your transformer design value, maybe there is an error in my calculation.
IRFZ44 is a MOSFET, not a regulator. You can use LM317 if you don't go higher than 1A. otherwise use an LM2576 switching converter. The Chinese boards for this are very cheap.
anyone made this circuit ?? i made this and i got 324VDC on the 5,6,7,8 pins in the IC and 5VDC at the VCC pin but no output from the secondary also there is something strange when i turn on nothing happens in the output but when i turn off after few seconds the LED bulb turns on and off. dose anyone get this issue??
How do you think the winding direction is good. why the PWM should start when there is no energy transfer. By the way, the circuit has been tested many times.
Transformers can be tricky if you are confused, even this simple transformer. if you have followed my PCB and correctly soldered the components, I don't see any other reason
@@MyVanitar i made the transformer using a chinese company and they provided me with a datasheet and i dismantle one checked it myself. Issue is the pwm switcher i think
The Output transient stability wont be optimal due to the 100nF. But anyway great project.
It’s would be great if you make a video to explain calculations step by step. Thanks for insights
Noted
Sir if I want 12V and 1A current for my project... How can I change my power to 12W....in circuit which part I need to change
This supply can handle a maximum power of 18W, which means lower than this power is of course no problem!
Hi Hesam. Thanks for this design and the video. Please allow me to draw your attention to a small error over on the very helpful PCBWay article for this design. Where you see this text, 'R3, C4, and D1 build a snubber circuit to suppress transient spikes of the transformer', I think D1 should be D2.
Thanks and regards, Rick.
Hi Rick, Yes, Thank you. D1 is output, and D2 is correct. Typo mistakes or some small errors could happen because of tiredness. Content-making is a difficult process. Thank you that you read the article and watch the video completely
Hello my friend. Can you share with me the Gerber Files for this board, I like you design very much and I have a project I am working on which this exact requirements. BTW, we also use PCBWay.
when I see somebody doesn't watch the content completely, it's a big turn off, because I mentioned where you can get more details including Gerber, fabricated board, … etc.
Hello, if I wind the secondary with 0.65mm wires making the same 8 turns will it make a big difference?
no, go ahead
@@MyVanitar What is the inductance margin in the transformer to avoid any problems? Thank you very much in advance for your help
that potentiometer in the output compensates any small transformer error. 0.65 and 0.67, the difference is very low
@@MyVanitar Ok, thanks for the help
Hey bro I really liked the way you taught everything crisp and clear. Can you plz also share to increase current rating to 2A and add multiple outputs to this pcb.
The chip's power is limited to 18W, so 2A for 12V is impossible. I was expecting that you invest time, watch the video completely, and read the article. I will publish another one with 2 outputs in the near future
how can i get 12vout / 4 amps from this design?
12V-4A means 48W. The maximum power of this Flyback chip is 24W. if you have a project request contact me via Email
@@MyVanitar i'm a college student and i wanted it for my for my project this semester, just having a trouble adjusting output voltage and current and controlling them separately . sadly i can't afford a project but i would really appreciate any tip you can provide .
I have a 12V-7A version on my channel. check the details for your info. The output of these supplies is not that much adjustable except you use a buck converter at the output
@@MyVanitar thanks .
Friend great video, I only want to know if there is possible a change to do the circuit functional with 110-AC ?
Good question. if you check the datasheet of the DK124 chip and the "power range" section, there is absolutely no problem with 110V-AC.
@@MyVanitar great and thanks friend :D
I put a 👍 even before seeing the video because i know it's gonna be a very good one as always 😁😁😁
You're the best!
Sir, What is the frequency when using LCR meter? 70kHz?
it depends on your LCR meter, some of them are manual and you decide the range, so you put the selector on the range to measure your inductor. if you have to enter the frequency, you must check other parameters such as the angle to check if your selected frequency is good.
Thanks a lot.
I have another question.
Why you using parallel in secondary winding?
that's the only way to handle more currents. one thick wire or two thin wires in parallel which is way easier to wind, especially on a small bobbin
I wonder how you set the flyback voltage in the transformer design.
I can't calculate your transformer design value, maybe there is an error in my calculation.
Couldn't you solve the inductance readings of the primary winding?
I like the way you explain things, easy to follow and understand
Thanks man
pls make a video on explaing the working of the same circuit
I did not get your point, Do you mean the circuit explanation? just check the article
@@MyVanitar yes, circuit explaination but in video format... Don't want to read long articles 😬😀
thankyou very much.
Welcome!
Hi from where the DK125 get its power from?? to the pin4
it builds the power internally, from the high voltage source
Thank you sri Lanka
welcome onboard
Can we make it regulated also ? 0-12 V
that's very easy. connect a linear or switching regulator at the output to make the output adjustable.
@@MyVanitar Which one should I use Lm317 or IRF44n or anyone else?
IRFZ44 is a MOSFET, not a regulator. You can use LM317 if you don't go higher than 1A. otherwise use an LM2576 switching converter. The Chinese boards for this are very cheap.
yay looks nice
Thanks man
Thanks
have fun
anyone made this circuit ?? i made this and i got 324VDC on the 5,6,7,8 pins in the IC and 5VDC at the VCC pin but no output from the secondary also there is something strange when i turn on nothing happens in the output but when i turn off after few seconds the LED bulb turns on and off. dose anyone get this issue??
You very likely made a mistake in winding the secondary, direction of the winding (if you have built this based on my PCB).
I doubled check the winding orientation it good. i noticed now the PWM switching isnt starting. did you come across this issue??
@@MyVanitar
How do you think the winding direction is good. why the PWM should start when there is no energy transfer. By the way, the circuit has been tested many times.
Transformers can be tricky if you are confused, even this simple transformer. if you have followed my PCB and correctly soldered the components, I don't see any other reason
@@MyVanitar i made the transformer using a chinese company and they provided me with a datasheet and i dismantle one checked it myself. Issue is the pwm switcher i think