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Humming In A Piezo Only


bassman

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I have just assembled my fretless,chambered, acoustic undersaddle transducer only bass. I have grounded the output, preamp and tuners (headless unit) (probably not neccessary or helpful since I am using tapewound strings) to the volume control. The humming goes away when I touch the volume pot or tuners- but not when I touch the strings since the tapewounds prevent electrical flow. The pickup is the Fishman Matrix Natural 1- with accompanying preamp. The 25 k vol pot is wired between the preamp and the pickup. Thank you all for the help. Oh, and besides the awfully loud humming, it sounds damn sweet.

Edited by bassman
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Problem solved, please disregard previous post. I spent many hours trying to get it solved before I posted, naturally- shortly after I posted I got the hum completely eliminated. Damn I love the way this bass turned out tons of fretless mwah, I will post some pics in the appropriate area as time permits.

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I was in denial the whole time, I knew deep down that maybe it was the lack of shielding (duh). However, I set it up and played it last week as a sort of test run to make sure everything was in proper order before i came closer to completion, there was absolutely no hum at that point and the tuners were not grounded. The difference is that it now has a single control- volume, that seems to be enough to require shielding. It seems rather silly that I just didn't sheild it- but I have never had problems with interference in the past, the past 21 electric basses I have built have had no sheilding ( all active preamps) and none of them have ever had hum/buzz problems on stage or in the studio. If you cant find the pencil, first check behind your ear.

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