I have searched around and googled for this but couldnt quite find what I need.
I want to build a 8 channel dimmer for 11.5V (12V) AC halogen lamps. The chanels have to be controled with an AVR so that I can programm the outputs.
The way to do this is simple with a 8 chanel PWM. But I do not know how to control the AC Voltage for the Lamp. I thought of a small circuit for each lamp using a Triac. But how can I combine the 11.5V AC for the Lamps with the 5V DC for the MC?
Thanks for any help.