Hi guys, since i'm new here, i greet you all
Now, we have a idea project, basically we'd like to control analog guitar fx pedals via MIDI, not only on/off, but complete control. So the first phase should be digital resistance control for controlling the pots on the fx pedal.
However, i only see maximum 1mA digipots listed on Maxim's site. I haven't found more powerful digipots of other companies via google. I think (haven't measured yet), that the current that goes through those pots will be larger than 1mA.
So if anyone can point towards more powerful digipot, or any kind of alternative. I had a brief idea to manually construct a digipot, serial connection of (n) resistors, each resistor bypassed by electronic gate. Open gate has close to infinite resistance, while closed gate has close to zero resistance, thus if the gate is open, the current will run through that resistor, if the gate is closed, the resistor gets bypassed. So you can control the resistance via signals to gates.
However, to simulate an 200kOhm 8-bit digipot i would need 128 serially connected 1.5kOhm resistors, with 128 gates, and a demultiplexer circuit that has 128 outputs. So this idea is a bit excessive.
Thanx in advance.