Hi Guys,
I thought I was ready to Rock'n'Roll but.....
I have a twofold query.
Firstly. I do not have a solder or experience in electrics etc.. so I got a 'Disc-o-Tone' prewired embedded Piezo pickup Harness from C.B. Gitty. This is a Pot, Jack and pickup embedded in a small circular piece of wood which you attach to the lid with the strong adhesive backing supplied (I'm sure you guys know what I mean with this set up).
Before sealing box, I strung one string to test it. There is a dreadful Hum coming through my little Roland Microcube Amp. When I pinch the exterior of the Jack it disappears or when I pinch the Pot shaft it disappears. How do I eliminate this?
Secondly. What is the point of having a bloody volume pot? During my 'test' I have to turn the volume pot up full AND the 'Master' and 'Volume' on the Amp up nearly full before any should comes through!
Any thoughts?
Do I need to remove the adhesive backing and glue the embedded pickup directly to the lid?
Would this help? I dunno!!
I have it fixed to the lid. snug against the neck (when lid is shut), below the bridge and as close to the 'bass' string as possible.
Yours, slightly annoyed,
Col
Tags:
Hey Brian,
Sorry don't know what you mean by 'grounding' the bridge/strings?
The bridge is a simple bolt which will be held in place when strings are tightened.
The Pot/shaft is tight against the wood/lid. fixed with washer and nut supplied. How can this be 'too tight'? Why on earth would you want it loose?
As for the pick-up, I think it's in the best position I can place it......
Cheers,
C
Should of bought a rod piezo bridge off Gitty
very helpful there Randy... Cheers!
All I would add is - check the polarity - red wire to the centre lead on the jack, just follow from the longest contact on the jack over to the solder point. The sleeve is the ground and should be black.
Wiring is correct.
There is the possibility of a cold joint at the vol pot case ground.
Have you tried the amp plugged into an outlet away from any radio interference?
What about a different amp entirely?
Have not played a piezo through a micro cube so can't say if an impedance mismatch is causing the limited volume problem.
If you can plug into an acoustic amp you can possibly eliminate impedance mismatch as a cause.
You could try alternate locations for the piezo such as the underside of the neck but if you are happy with where it is now carry on.
If you can't sort this out contact Ben (C.B. Gitty), he'll take care of you.
I stopped testing with cheap cables. I live in a city, with lots of electronic interference. Those cheap plastic cables can sound awful. I shelled out the cash for a good braided cable. It has cut the electronic hum in order for me to pinpoint a real issue. Just my experience.
volume issue: you should be able to get a lot of sound out of the piezo by tapping on it with your fingernail while plugged into the amp. that will tell you if it is a placement issue or if it is got too much dampening material surrounding it. a bare disk taped to the inside lid should allow a 10w practice amp to make the spouse cover her ears.
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