Output CVs always sending current

Hardware Development
1

I have here my Patch SM that keeps sending voltage out of it’s CV outputs, even when I program it to send 0 out of the 4095 position possible. It’s obvious that it is’n’t much, something around 50mV, but it still enough to trigger the Level CV input of my Mutable Instrument’s Plaits. I unconnected my Patch SM from it’s usb plug. Is it normal behaviour? Could It be a ground issue, or maybe because I use two different PSUs for my microcontroller and my module?

Thank you :smiley:

2

Yes, it’s normal behavior, due to variations in op amps, etc. A solution is to add calibration to your firmware to minimize the ‘error’.