BMC040 dual logic CV mod

[Sonosus]

Analog input pot resistor/capacitor question

The circuit probably works fine without them – the analog inputs are high impedance and the potentiometers cannot produce voltages that the inputs cannot handle – but they provide a bit of extra safety and robustness. The capacitor is there to make sampling more reliable; the analog input works by charging up a small internal sample-and-hold capacitor, and for that to work the external circuit must provide enough current to fully charge the capacitor during the very short sampling window. You c…