Preamp for cello piezo pickup - diyAudio
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Old 8th March 2012, 11:50 PM   #1
cseko is offline cseko  United Kingdom
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Default Preamp for cello piezo pickup

Hi all
I recently did a pickup for my cello made of piezo film, with a minimalist fet buffer. I really want to take things to the next level, building a stereo preamp (one channel for pickup, other for mic, or maybe two piezos in different place), with a blender, combined with a DI, adding a monitor output for headphones...
My question is can you recommend a good design for the preamp? I got quite a few designs, but I wanna ask around if any of you had experience with piezo cello preamp, or similar, simply because I don't have enough free time to experiment with all different designs.
I like one with gain control, some basic eq, and blend control.
Any ideas, advice?
Thanks
Gabriel
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Old 11th March 2012, 05:48 PM   #2
bill_a is offline bill_a  United States
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Gabriel,
I'm not sure this is the right forum for your question, but I'll take a shot. I recently built a preamp for a piezo pick-up for a harp, but nothing like what you're looking for, just a FET buffer to drive the cable and amp.

I think you might be better off doing individual preamps for the piezo and mic to get the signals up close to line-level, then going into a traditional mixer. There are a few DIY mixer designs out there if you don't want to buy one, but overall, your desires are pretty advanced, especially given you don't have a lot of time to devote to development and debug.

Just my thoughts,
Bill
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Old 11th March 2012, 08:10 PM   #3
cseko is offline cseko  United Kingdom
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Hi bill
Yeah, maybe I'm in the wrong place....
I made up my mind to put two piezos on my cello, so the preamp doesn't have to be stereo, i can just put a blender before the first stage.
I do have experience building preamps, and different kind of amps, effects, etc, but i'm quite new with piezo film.
I got a design from albert kreuzer, really good design, 3 stage jfet (if you bypass the eq), and quite easy to build.

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My only dark spots are:
never done piezo blender, does it work the same way than the magnetic pickup?
how can i run the whole unit off phantom power?
(obviously gonna have to change the input resistors, and gonna leave out a few switches)
I do have the time to debug, just don't wanna go through building loads of different designs...
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Old 11th March 2012, 08:52 PM   #4
kevinkr is offline kevinkr  United States
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This is musical instrument related so it belongs in the Instruments and Amplifier forum where it will probably also get more attention.. (Note copyrighted material removed)
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Old 13th March 2012, 12:39 AM   #5
bill_a is offline bill_a  United States
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Gabriel,
All good questions that I'm going to defer to someone else. Sims of the buffer I built showed it only consumed about 300 uamps, so I just stuck a 9V battery in it and called it good. It works just fine for this application and should last a long time.

Bill
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Old 13th March 2012, 12:50 AM   #6
cseko is offline cseko  United Kingdom
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I think I know which one you mean, I actually built Don Tillman's preamp cable, single stage fet pre, runs off phantom power. I t sounds good, that's why I was thinking of a similar design
http://www.albertkreuzer.com/pics/el...eamp_sch21.gif
this one is ot too much more complicated, and got all necessary controls i need, and by adding a di and headphone out it would become my new best friend
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