Electronics > Beginners

Simplest circuit to connect/diconnect a wire.

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hgg:
A single MOSFET did not work.
Two MOSFETS with connected source to source and gate to gate did not work either.
The only thing that finally worked was the following:



SilverSolder:

That looks good.  Funny how even the simplest projects can end up surprisingly complicated!

max_torque:
er, just use a relay.


Cost buttons, nothing complex, provides isolation etc etc. There is no speed or high repetition rate required and it is replacing a mechanical switch (which uses human power to push two bits of metal together to make contact) with a relay (that uses a magnetic solenoid to push  two bits of metal together to make contact)

ebastler:

--- Quote from: max_torque on April 21, 2019, 12:36:48 pm ---er, just use a relay.

--- End quote ---

Well, from the OP’s experiments and the solution he came up with, it looks like the PIR output is a bit wimpy. Not sure whether it could drive a relay directly?

hgg:
@SilverSolder  Indeed.  When I started this mod, I thought, that would be pretty easy.

@ebastler Its the HC-SR501.

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