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Positive, Negative and Ground via single pin

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kiran_shrestha:
Hey everyone. I have been designing circuits for years but I never thought this could be a problem for me.
This time I came up with a problem. I need to design a small circuit based on mosfet or OPAMP which can switch between 0 , +V and -V from single output pin with control signal.
I can't use relays or multiplexers, I need a OPAMP or MOSFET design idea. If someone have idea please let me know.

KaneTW:
Any R2R opamp could do it with binary inputs on inverting and noninverting. Kinda overkill though.

For MOSFETs, just do a halfbridge but with a third MOSFET for V- IMO.

kiran_shrestha:
Yes, thank you for it. The op amp solution i not good for me but i think the mosfet circuit would work for me. I will give it a try.

Mechatrommer:

--- Quote from: kiran_shrestha on April 01, 2020, 05:47:04 am ---I need to design a small circuit based on mosfet or OPAMP which can switch between 0 , +V and -V from single output pin with control signal.
I can't use relays or multiplexers, I need a OPAMP or MOSFET design idea. If someone have idea please let me know.

--- End quote ---
what exactly is the specification? what power rails available? whats magnitude +V and -V we are talking about? what control signal level and speed? what is the single output? and what its driving? if you ask for people's time, you should give more details. better with diagram or existing circuit/schematics.

kiran_shrestha:
Thanks for reply Mr Mechatrommer but I just required a logic not a final schematic.

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