Help making a biphasic square wave circuit:

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1

Hi,

I need help making a biphasic square wave generator circuit.

By “biphasic,” I mean that the circuit should output a pulse of an alternating positive and negative square wave of the same magnitude.

I also need the circuit to have variable frequency (15 - 40 Hz) and pulse width (100 - 500 microseconds).

Any help would be appreciated.

Thanks,

Salty