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  1. 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...
  2. 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...
  3. 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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