tmod
Newbie level 1
From https://www.bit-tech.net/article/51/ ...
**broken link removed**
I would like to adapt this circuit as an LED dimmer (C1 will be 33nF so the PWM frequency is higher...), but instead of the thermsistor, I'd like to use a phototransistor (less light = brighter LEDs). However, I'm not exactly sure on how to do it since a phototransistor lets more current through under a greater amount of light. What would be the best way to make the effect the inverse of this?
**broken link removed**
I would like to adapt this circuit as an LED dimmer (C1 will be 33nF so the PWM frequency is higher...), but instead of the thermsistor, I'd like to use a phototransistor (less light = brighter LEDs). However, I'm not exactly sure on how to do it since a phototransistor lets more current through under a greater amount of light. What would be the best way to make the effect the inverse of this?