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  1. C

    Sanity check: VGA Controller for Arduino

    Thanks a lot! This is a really good idea. :)
  2. C

    Sanity check: VGA Controller for Arduino

    Good idea, and thank you!
  3. C

    Sanity check: VGA Controller for Arduino

    Hi guys, I'm making a VGA controller board for Arduino, and it looks good to me, but just want a sanity check (especially for the RP2040 section, as I have never used that before) before proceeding to PCB production. I can't breadboard test it as the frequencies involved are too high. How it...
  4. C

    Range on PWM circuit not good

    Hi guys, I have built a PWM dimmer for a 12v 20w halogen lamp using 555 timers but the brightness range isn't good, even though according to the formula, the duty cycle range should be decent. As you turn the potentiometer, there is very little change until it suddenly drops down from 11v to...
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    Is there anyway this circuit could be improved?

    Thank you!
  6. C

    Is there anyway this circuit could be improved?

    i measured the output and when i adjust the r2 potentiometer the frequency changes alongside the duty cycle. how can i prevent this?
  7. C

    Is there anyway this circuit could be improved?

    ok. what is the maximum switching frequency of the tip31c though?
  8. C

    Is there anyway this circuit could be improved?

    The bulb whines at lower duty cycles. Is there any way this can be prevented?
  9. C

    Is there anyway this circuit could be improved?

    20W
  10. C

    Is there anyway this circuit could be improved?

    Hi guys! I'm learning electronics and have challenged myself to design a PWM dimmer circuit for a halogen bulb. I have build the circuit below and it works but I always want to learn from these so is there any way this could be improved?
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