Sunday, February 17, 2008

Cost-Benefit


Along with the almost indescribable pleasure derived from making piezo pickups come significant savings. Below I’ve compared the prices of three commercial piezo pickups to the cost of making your own. I chose three pickups very similar to my piezo disc pickups, i.e. piezo discs soldered to a cable with a jack or plug at the other end. The price for the Hot Spot is from Experimental Musical Instruments; for the next two, from Amazon. None of the prices include shipping.

K&K Hot Spot

$32

Barcus-Berry Piezo Transducer Interior Mount

$54.95

Fishman National Resophonic/Resonator Guitar– Passive

$109.95

Average Cost

$65.63


Now consider the approximate costs of making your own:

Piezo disc

$0.50

Shielded Cable

$3.00

Jack or Plug

$1.50

Solder, foil, etc

$1.00

Total

$6.00

The cost for the homemade pickup is per unit, assuming you make two to four, and thus decreases the more you make. I haven't included the cost of tools you might need (soldering iron, wire clippers, etc.). But, if you didn't have them, their costs would likely be comparable to the shipping you would pay for any of the commercial pickups.

I don't own any of the commercial pickups and maybe they sound great. But, I would be surprised if they sound 5X to 18X as good as the homemade pickups. It's likely these manufacturers purchase their piezo materials from the same source I do or you would. In regard to discs specifically, I haven't come across any "really good" expensive discs. They all seem to be intended for cheap buzzers.

Another benefit I came across recently is that because piezo-electric materials don't pick up sound, multi-tracking is headphone-free. For any successive track, I can play along with my monitors. Also, I can record while my 5-year olds run around the house screaming. These benefits would accrue however, even if you paid $110 for piezo disc with a wire soldered to it.

Sunday, February 10, 2008

Tequila!

I haven't made any new pickups this week and so thought I would entertain both of my devoted readers with a delightful recording of Tequila!

I recorded everything with a piezo pickup except for the shouting, which was provided via microphone by my three in-house vocalists. Everything went straight into the Firebox. The details:
  • Ukulele -- I doubled tracked the ukulele, both times using the small piezo disc taped in front of the bridge. One of the ukuleles has a bit of VST chorus I forgot to take off before I mixed down to two tracks.
  • Telecaster -- I taped the large piezo disc, which has a very tinny sound, between the pickups. I then applied the free VST Electri-Q equalizer, using a setting named "Electri-Q Guitar."
  • Electric Kazoo -- a very noisy instrument, made by taping the small piezo disc to a kazoo. I applied the now outdated Amplitube LE VST amp simulator to beef up the sound and then a VST limiter to get rid of some of the noise.
  • "Cymbal" -- this is a pot lid, hung from a mike boom by a string and played with a wooden chopstick. I taped the piezo film pickup to the bottom of the lid.
I added a little bit of reverb (using the free Vosengo OldSkoolVerb) to the final mix.

Tequila!

Saturday, February 2, 2008

It Takes Two (or Maybe Three)

I've built a new pickup that sounds very good. I wired two small piezo discs in parallel and laminated them.


I soldered on a short piece of shielded cable with a 1/4 phono plug and then wrapped the square of laminate in copper shielding foil, letting the conductive adhesive contact the ground.


Connecting the piezo discs in parallel halves the output impedance, which might account for the good frequency response. It also could be that the two discs pick up a more representative sample of the soundboard vibrations, but they're not very far apart. Having two discs wired in parallel cuts the signal too, so I needed to add some more gain from the preamp.

Below is a sample recorded with the pickup taped behind the bridge of my nylon string guitar. The selection is my attempt at Beck's version of Skip James' Jesus is a Mighty Good Leader. The sound has an odd muffled quality, but overall is good. I may try three discs next.

He's a Mighty Good Leader