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Old 24th September 2011, 04:27 AM   #51
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I got my piezos and wire stripper in the mail. I did a test. I put the piezo right on the treble side of my guitar bridge. IT WAS SUPER LOUD!!! I had to keep my amp on two. Honestly, I couldn't get a bad sound. I EQ'd it 7 different ways. I ran it flat, treble, bassy, middy, etc., and it sounded good.

I ran it straight into my Line 6 amp, and I don't think there is any need for a preamp. I will try to get some audio posted up or something.
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Old 1st March 2013, 09:32 PM   #52
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Quote:
Originally Posted by Nigel Goodwin View Post
No you can't , you MUST use a very high input impedance preamp, guitar amps etc. aren't usually high impedance enough. It's not gain that's the problem, it's the impedance.

But to be honest, just going from what you've said, the entire thing sounds a bit of a scam.
You need a buffer.
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Old 5th March 2013, 05:58 PM   #53
JMFahey is offline JMFahey  Argentina
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It depends on the Piezo capacitance.
If you use some factory made tiny piezo, with a crystal 1/4 the size of your pinky nail, yes, you *will* need a high impedance preamp, and as close as possible to avoid cable capacitance losses, but for a homemade piezo pickup made out of a 1 inch diameter buzzer or tweeter crystal, requirements are much lower.
FWIW I have measured such disks and found between 0.082 and .125uF capacitance, which into a very low input impedance about 100K gives me a low frequency cutoff of around 20Hz, way below what any Guitar or Bass can put out.
Of course a buffer (gain is usually not needed, they are *hot*) lowers output impedance even more and allows for real long cables without trouble.
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