![]() ![]() Circuit gain is about 7.2, which is better than for the MPF102 circuit. Wow The high-impedance circuit works beautifully The output into a tube guitar amp should be even better. ![]() For the test, I ran the output into my Radio Shack amplified speaker. So there's a whole bunch of different ways to DIY your own piezos. I built the circuit on a plugboard and tested with a piezo pickup. If you don't mind spending the money, here is a turnkey solution: įinally, some floating bridge mounts for ukes, using Washburn-style piezos you can find on eBay: Example 1 no Eq applied to piezo: Example 2, with Eq around 400Hz (+5db), 2700Hz (-5db), 2.5kHz (+3db): What I have observed this week: - piezo disk on headstock does a very good job. Here is another that works very well, and is completely stealth: Here is a very successful mount that I made: Simply sticking it on somewhere might work for something high-pitched like a violin, but it works very poorly for a bass, and almost as poorly for a guitar. Mounting a piezo for good frequency response is much more difficult. a microfone input that you can mix to the piezo (if its an outboard preamp you may consider a xlr input, phantom power, etc. The signal from the output is coupled back to the junction of R1, R2, R3 and C2, with the latter in series. The impedance buffer is actually the easier of the two. Guilherme wrote:Some other useful features for a piezo preamp: - a polarity ('phase') switch can help killing unwanted feedback (a variable notch eq can also help). The bootstrap circuit consists of R1, R2, R3 and C1. Two things are critical: impedance buffer, and mounting. I've done a good deal of tinkering with peizos. ![]()
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