I wish to remove 2 resistors in power supply unit and put variable resistors that would be controlled by my microcontroller.
- 1st resistor should be in range of 3000-6000 Ohm
- 2nd resistor should be in range of 0-200 Ohm
I am not very familiar with power supply I wish to tune and I guess I can use a set of relays to switch resistors.
I also saw some amateur radio have stepper drivers that rotate variable capacitors. May be it is possible to rotate variable resistors.
I guess if I knew that one pin of resistor is ground then I could use transitors instead of relays but it seems it is more complicated scheme with feedback OpAmp.
It seems to be complicated and possibly there is some chip that I can use to switch resistors from a range like 74HC4067 ?