Have a piezo wired as in pic. When switched on its fine. Switched off with toggle spdt switch off position (two prong)very noisy. Here's the diagram . Anyone know how to reduce the (off position noise? Thank you.

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Darryl,
As Wayfinder mentioned previously the switch somehow only introduces noise when off...kinda funny ....it's only when it's off it introduces noise....Wayfinder I think nailed it because it doesn't complete the circuit when it's off. Wow I'm thinking now it's just silly to have an off switch at all....it's costs more anyway. There is something related to grounding because when I touch the cable when it's off I can eliminate the hum/buzz but I just don't know enough about electronics to be 100% sure. Im also a little scared of touching anything plugged into an outlet unless I know for sure. I appreciate all the help very much!
Yeah. I must admit the little light and the ideas here is wonderful... but practical the jack and piezo is enough to make music...
Wayfinder,
Absolutely what I needed. jimmy page with a piezo ...thank you for the diagram!
This is great!

sorry for the dumb question Jon, but does this amp make the same noise if you pull the plug out of the git?

Haven't yet...I will check tonight
It does make some noise. It's doesn't make the same level of noise.

1) try another instrument cable or 2, I have a small growing pile of 'dead' noisy cables cause my band mates keep walking on them during practice and shows....

2) with a 'good' cable and no instrument, try to EQ the noise out of the amp.

this will at least eliminate other sources as you chase this down....

Thank you. I will keep trying and let you know...I appreciate the help. Probably will end up trying a different switch as Wayfinder described or eliminate the switch completely. But before I do I will try a resistor as well as other cables as you mentioned here...nice eq idea as well. Thanks!

It sounds like a defective switch. Sometimes soldering wires to the jack will drop little beads of solder in between the insulators and grounding the jack, so make sure that's not the issue.

I will check . Thank you. This type of switch has had this problem before but I'm not so great at soldering so I appreciate the feedback

Soldering takes practice.

Heating the wire and the terminal and then applying the solder is often recommended letting the solder melt and flow to the heat. If those items are heated to long though, solder can drip all over and lead to shorts or overheating damage to components can occur. Heating the solder then applying to the wire and terminal can lead to cold solder joints if not done right.

Practice  practice practice. 

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