Last time I asked about changing a sensor (which is a potentiometer) output in various ways. I've decided to go with an opamp and circuit like this:
Now I'm looking for some device that will disconnect the opamp from the potentiometer output based on an ON/OFF (3.3V) signal.
Right now the options I see are:
- Relay - does exactly that, but I don't want any mechanical parts, also the dimensions are an issue.
- MOSFET or MOSFET relay - the opamp output must be always higher than Vgs of the particular MOSFET.
- Bipolar analog switch like the MAX4541 - it has low I/O current and I need higher current capability because of the resistor and potentiometer values.
What else can be used?
Also can anyone tell me about a good alternative to AD8244 unity gain quad buffer? I need only one buffer circuit with a smaller and easier to hand-solder footprint (SOT23-5 maybe.)
I will use MOSFET SSR as suggested in comments. Question regarding AD8244 alternative remains.