Electronics > Beginners
spdt switch
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fixit7:
I should have shown this earlier.

https://www.dropbox.com/s/0dyg6wogy341lhd/KEEP_circuit.jpg?dl=0

I have a 3rd wire going from switch to the negative of the buzzer.
Richard Crowley:
Your photo shows a DOUBLE pole, double throw (DPDT) switch.  But your circuit is using only one "pole".  It is common to see double pole switches connected with the poles in parallel. That provides a rather more reliable action for small-signal applications like yours. I would strap the sections in parallel if you don't need double-pole operation.  Old-school open slide switch designs like that are not necessarily reliable for very low power applications.
ebastler:

--- Quote from: Richard Crowley on May 22, 2019, 11:44:18 am ---Your photo shows a DOUBLE pole, double throw (DPDT) switch.

--- End quote ---

I see a SPDT switch, and a shadow.
fixit7:

--- Quote from: Richard Crowley on May 22, 2019, 11:44:18 am ---Your photo shows a DOUBLE pole, double throw (DPDT) switch.  But your circuit is using only one "pole".  It is common to see double pole switches connected with the poles in parallel. That provides a rather more reliable action for small-signal applications like yours. I would strap the sections in parallel if you don't need double-pole operation.  Old-school open slide switch designs like that are not necessarily reliable for very low power applications.

--- End quote ---

I must need a double pole switch because when I substituted a spdt switch, the circuit stopped working correctly.

Richard Crowley:

--- Quote from: fixit7 on May 22, 2019, 03:12:03 pm ---I must need a double pole switch because when I substituted a spdt switch, the circuit stopped working correctly.

--- End quote ---
That makes no sense at all.  Your circuit clearly shows a SINGLE pole, double throw switch.
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