I read in the manuals that you should never feed the NS1 with signals other than in the range of 0-5 volts. But is it safe to use the digipots for line level audio signals, so you can use them as a sort of a VCA or automated volume control for other instruments?
The two ends of the digipots aren’t hardwired to grounds so it could work just like any potentiometer I think? Mixing before the amp on board might be weird, though. I don’t think the mix points would cut off the negative portion of the signal. I’m not sure about the circuit, but you could put a resistor before your signal mixes.
You could also put your signals at a middle voltage reference point with a breadboard, a quad op-amp and a few resistors. The amp removes the DC offset.
Yes exactly, I thought that if they work as any potentiometer it should work. Actually I wasn’t thinking of mixing the signals back into the synth, but perhaps control on/off or volume of an external source with the ribbon or a button, through the Arduino. I’m not sure about the exact level.
If I mix it into the synth I guess I should shift the level as you say. How would you do it with an op-amp, is there an example somewhere?
Digipots are, unfortunately, bound to the power supply of the IC, in this case 5V. You can, with a small polarizing network (a voltage divider) and a capacitor before it (coming from the signal) put the signal at half this voltage and then attenuate it…
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