If Current = True Then Close This Circuit

[[email protected]]

I am basically looking for a way to detect a small current that was
intended to turn on a piezoelectric buzzer and if it senses a current
there, to close a circuit on the same board.

You know...no matter how novel or noble my ideas are...they always
sound like I'm trying to make a freaking bomb...

 

[PeteS]

I am basically looking for a way to detect a small current that was
intended to turn on a piezoelectric buzzer and if it senses a current
there, to close a circuit on the same board.

You know...no matter how novel or noble my ideas are...they always
sound like I'm trying to make a freaking bomb...

How small a current?

Think sense resistor and amplifier.

Cheers

PeteS

 

[Walter Harley]

How small a current?

Think sense resistor and amplifier.

Or relay, or photocoupler. If you've got 3mA to work with, a photocoupler
will probably do just fine. If you've got 50mA, an electromechanical relay
will work.