I have an electric cello that was originally equiped with active pots and a piezo pickup. I removed the active pots and put in a passive circuit based on a fender precision design. The tone control and volume control don't work together very well. Is there a right way to wire the piezo pickup without the active pots?
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Originally posted by nbtone View PostI have an electric cello that was originally equiped with active pots and a piezo pickup. I removed the active pots and put in a passive circuit based on a fender precision design. The tone control and volume control don't work together very well. Is there a right way to wire the piezo pickup without the active pots?
Why did you remove the active circuit?It would be possible to describe everything scientifically, but it would make no sense; it would be without meaning, as if you described a Beethoven symphony as a variation of wave pressure. — Albert Einstein
http://coneyislandguitars.com
www.soundcloud.com/davidravenmoon
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I'm using a tube preamp, and the transistor preamp is not a good thing for the tone quality. I'm getting a better tone quality without the active pots, but the controls aren't working the way they should. There is one control setting where the tone is best, but turning either control up or down takes away from the tone. It's strange.
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You are getting better tone because it's probably not a god sounding pickup to start with, and the lack of a very high impedance preamp is smoothing the high end out.
You wont be able to use passive controls with the piezo however.It would be possible to describe everything scientifically, but it would make no sense; it would be without meaning, as if you described a Beethoven symphony as a variation of wave pressure. — Albert Einstein
http://coneyislandguitars.com
www.soundcloud.com/davidravenmoon
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Originally posted by David King View PostSome tube amp preamp designs have very high input impedance. Get some 5 meg ohm volume and tone pots. 250k or 500k are WAY too low for this.It would be possible to describe everything scientifically, but it would make no sense; it would be without meaning, as if you described a Beethoven symphony as a variation of wave pressure. — Albert Einstein
http://coneyislandguitars.com
www.soundcloud.com/davidravenmoon
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That's what we are saying.
What you are trying to do is pretty unorthodox. These pots aren't easy to find and unless your amp was specifically designed to handle piezo output you probably aren't going to be happy with the results.
Piezos put out a lot of voltage at very low current. Most amps are designed to handle magnetic pickups that have very low voltage output with more current.
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I was looking in the new Nuts And Volts magazine, and they mentioned these preamps:
http://secure.oatleyelectronics.com/...roducts_id=722
http://secure.oatleyelectronics.com/...roducts_id=784
Do you think either one would make a better preamp for the piezo pickup?
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