![]() How to build one yourself is described here.Īll you need to build the piezo-pickup is: So be sure to only use amps with a high input impedance (>1MΩ, better >10MΩ) or put an impedance matching (more precisely: impedance bridging) circuit in between. If you connect an amplifier with a lower input impedance to your pickup, you will get selective reflection of some frequencies (mostly the low ones) and that doesn’t sound well. This is because piezos have a very high impedance. If you use a piezo-pickup with an ordinary instrument amplifier you will often hear a shallow metallic tone, lots of fretboard noise and very little low frequencies. The tricky part about a piezo-pickup is designing a good amplifier to go with it. Also they don’t require magnetic strings which is nice for all you friends of nylon and gut strings. This is especially important for double-bass pickups in the low 20 to 600 Hz regime which is notoriously difficult to capture well. The big advantage of piezo-pickups compared to microphones and magnetic pickups is their sensitivity and linear frequency-response. ![]() ![]() The same transducers build into professional pickups can be bought at your local electronics store for less than a buck. Those pickups can be quite expensive if you buy them at a music store but actually there is not much to them. Here I’d like to share my version of a piezo-pickup for a double bass (and most other instruments). ![]()
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