Currently I have a lighting controller that is used to control DSI controllable fluro fittings. The unit is controlled using an ATMEGA8. Problems however exist with the output circuitry - its output voltage becomes too low once the load increases- this is due to the circuit design used on the output stage (refer to attached pic).
What I was wondering is if anyone has a simple solution to this problem that could perhaps be used on the existing PCB (with minimum modifications)?
DSI signalling is simple +12v(1) and 0v(0) and can operate down to around 10v before the system stops working.
The current output configuration circuit pic is attached.
Ideally I want be able to switch up to about 80mA@12V for the output.
Look foward to some responses.
Thanks in advance,