Make sure there is no short-circuit and maybe put some glue on the solder for stability. Solder the shielding of the coaxial cable to the yellow (or sometimes silver) colored part of the disc. Solder the center wire of the coaxial cable to the white center area of the piezo-disc. a 6,3 mm audio jack socket (or 3.5 mm if you prefer to keep it small).shielded, flexible, single channel (copper braid works best), coaxial cable.a passive piezo-disc (I used a FT-36T), if you have an instrument in a low frequency range pick a large one, generally try to avoid a disc that has its resonance frequency in the range of your instrument, because this frequency will otherwise dominate all the others.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).
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |