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Permalink Reply by David Bowes on August 10, 2014 at 3:42am

Welcome to Cigar Box nation, very nice first build.

I use the diagram below and it works, never added a capacitor. I have started using 2 in series to increase the voltage

David

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Permalink Reply by David Bowes on August 10, 2014 at 3:45am

Forgot the diagram sorry.

http://www.cigarboxnation.com/forum/topics/help-need-wiring-diagram...

Attachments:

• Wiring Diagram.htm, 1 KB

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Permalink Reply by EMERIT Vincent on August 10, 2014 at 3:55am

That's the same diagram, but I don't know why, I need to put the volume of my amp very high to heard what I play.

Perhaps I have to had one more piezo???

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Permalink Reply by Dan Sleep on August 10, 2014 at 4:31am

Is the piezo mounted to the lid already? If you tap on it, does it make any sound?

Piezos are so sensitive you can practically breath on them and get sound out of them. Obviously, make sure your solder joints are good.

When you glue the piezo to the lid, you need to make sure it makes good contact with the lid. Either hot glue or epoxy is best. I would not suggest super glue.

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Permalink Reply by EMERIT Vincent on August 10, 2014 at 4:41am

I think there is no problem with the piezo because it make sound when I tap on the cigar box.

Do you always put 2 piezos in series ?

My mistake can be in using only one piezo.

Sound comes out of my CBG but the level seems to be very low

Thank you evrybody to try to help me, that's really a good place here ;-)

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Permalink Reply by Ron "Oily" Sprague on August 10, 2014 at 5:18am

The issue isn't necessarily adding another piezo (although it might help some). Piezos have relatively high impedance, and unless you have separate low and high impedance input jacks on your amp, or your amp has a built-in preamp, you will need a pre-amp to boost the signal so your amp can amplify it. Adding a piezo in series can help reduce the resistance some, but adding a pre amp will solve your probable current impedance mismatch. There are Chinese pre amp units available from C.B. Gitty, or elsewhere on the Internet, for cheap, that run off a 9v battery.

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Permalink Reply by Cause the Blue rat on August 10, 2014 at 5:26am

Check your jack and make sure your hot and ground are on the right sides.

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Permalink Reply by EMERIT Vincent on August 10, 2014 at 5:35am

I have already cheled that I think Ron is roght because when I use my vox amplug at the output of my CBG and connect it to my amp, it work well.

So I think I probably need a preamp but somebody can give me the diagram to built one ?

I'm sure that others people met the same problem as me and found the solution.

I will take a long pre-amp unit, but if somebody can help me to built one, it will be great.

Thanks very much evry body

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Permalink Reply by Ron "Oily" Sprague on August 10, 2014 at 5:40am

http://www.cigarboxnation.com/photo/album/show?id=2592684%3AAlbum%3...

Use the Search, and you can find more examples.

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Permalink Reply by EMERIT Vincent on August 10, 2014 at 10:00am

Thank you everybody for your help, I will buy some cheap pre-amp and try.

I keep you in touch

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