Hi All –
My application requires precise control of voltage between 0-10V (I have an air pressure regulator that responds linearly to input voltage between 0-10V and provides 0-1PSI). I first tried using the following digipot: MCP41010-I/P. I burned a couple up and soon realized it was only rated to control up to 5V output, and I was applying 10V to it.
I asked if a digikey tech could help me find a through hole digipot good for controlling 0-10V with decent resolution (256 taps is about what I need). They said digikey does not carry a digipot that fit my requirements.
I was direct by the Digikey tech to buy the following solid state relay for my application: CLA274-ND, and control it with PWM output from my Arduino. I connected pin 1 to 10V, pin 2 to an Arduino PWM pin, pin 3 to ground, and I am measuring the output voltage on pin 4 (which will be connected to the air pressure regulator). I seem to be getting non-linear output from the SSR with linear PWM input from the Arduino. Any thoughts? Did the tech steer me wrong in this application?