Any body have a clue why I get this loud squealing feedback through the amp when I try to turn up the volume? It is not corrected by moving further from the amp. This is a piezo pickup mounted to the underside of the lid.

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I made an instrument called a feedbackophone. It needed an open space from the mic to the speaker in order to work. When my friend's CBG fedback a lot, I assumed it was because it had a massive soundhole on the front. I made my first CBG with no sound hole and it still projects pretty well acousticly, but the real difference seems to be that there is a lot less feedback when it is plugged in and turned on.

Hi all

For what it's worth....

On my first cb guitar I mounted 4 piezos under the soundboard still in their plastic casings. These were fitted with both a layer of Lidl repair glue and 2 screws in each using the casing holes (2 per piezo). I get massive feedback with this guitar similar to that which others are reporting.

Somewhere on this site there is a video about using a capacitor in parallel to reduce, but not eliminate, feedback.

My first guitar is well sealed-up so I can't easily get into it to try a capacitor but I certainly will deploy one in my next project...and on this occassion I will just glue the piezos (out of their cases) under the soundboard...This time I plan to use 2.

Cheers.....Bernie

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