I'm trying to design a 0-10V DAC, and had it working just fine until I realized that the lights that I'm using it with (as a dimming control) provide the 10V source, and I need to sink the voltage to the right level (via current draw). I can provide a 0-5V analog signal to drive an op amp, but can't seem to figure out the op amp side to draw the voltage down to the right level from there. What I've found online mostly uses an NPN transistor or MOSFET, controlled by the op amp, but I can't seem to get it to work with the 10V provided from the lights.
Can anyone point me in the right direction? Thanks!
Can anyone point me in the right direction? Thanks!