I am making a prototype in which I have run into a problem.
In one of the parts of the electronic circuit I have an operational amplifier fed back with a potentiometer of 1Mohm.
I want to replace this potentiometer with a digital potentiometer, but I can not find one that meets my specifications.
My power supply is 0-9V and most of the potentiometers that I have found are up to 5V and those I have found of higher voltages are 200k at best.
As a possibility I know that there is 5 of these potentiometers in cascade and solved. But I wanted to expose my problem in case someone knows a particular model that I can use or a different solution.
High values like 1M are very rare for digipots. High voltage digipots are also very rare, the combination
of high resistance and high voltage is tricky.
It may mean a circuit redesign. So what is this circuit?
Zaelectronics:
As a possibility I know that there is 5 of these potentiometers in cascade and solved. But I wanted to expose my problem in case someone knows a particular model that I can use or a different solution.
This is by no means the case - the latency and stray capacitance in such an arrangement may
destabilize the feedback path. 1M as a feedback value is unusual, and would often require a small
capacitor in parallel to guarantee stability.