Comment

Comment by Chris Ellbogen on January 31, 2012 at 2:56am

I did ground the back of the pot, and the buzz gets worse when I touch the strings. 

Comment by Servaas (Der Groovemeister) on January 31, 2012 at 1:04am

Did you ground the back of the pot? Furthermore I wouldn't use a 250k pot, but at least 500 or 1M. 250K cuts the highs too much with piezo discs. It's fine with magnetic pickups however. But that's just my opinion.

Comment by Chris Ellbogen on January 30, 2012 at 12:06pm

Can any one help? I just finished up a 6 string cbg with license plate sound board. It has two transducers 250k volume pot and 1/4" mono output. When the volume is in any position other than all the way up or down it has a horrible buzz. I used a wiring diagram found in this forum. Any help would be appreciated. 

Comment by eric gittins on January 22, 2012 at 12:41pm

take a look at this thread silverback - some useful experiment options if you pan down a bit.

<link>

i dont' know what circuit you're using, but those component values are standard magnetic pickup values and given that piezos have very different load requirements, i would expect results to be sub optimum.

Comment by Silverback on January 22, 2012 at 9:07am

tone control. I just used the wiring diagram from "Handmade music factory" for a jack, piezo, volume pot and tone pot. I've got 500K pots and tried both .022 and .047 microfarad capacitors. I can't hear any difference in tone so far. Looking on line I see a number of comments that tone controls hardly work without a preamp. Q: Is the tone knob a waste of time for a CBG build?

Comment by Ted Crocker on January 7, 2012 at 12:42pm

phil

Comment by David L. on January 7, 2012 at 9:57am

Hi Phil,

If you just change the magnetic pickups on the diagrams for piezos -

if the lugs are all on the same side page 11 of the Artecsound wiring diagrams will show you how to wire up http://www.artecsound.com/wiring/wiring_book01.pdf

If the switch has 4 lugs on each side the Seymour Duncan diagram will show you how to wire up. http://www.seymourduncan.com/support/wiring-diagrams/schematics.php...

Comment by phil noel on January 7, 2012 at 7:50am

i have 2 piezo's . i want to wire to a 3 way toggle switch, the switch i have is off a tele and has 8 connectors . i want to wire it so it has 1 piezo neck poss. mid poss, both piezo's. back poss. bridge poss.. any help would be gratefull . cheers..

Comment by Matt Quinney on January 6, 2012 at 12:54am

Oops, I meant to post a this excerpt from the piezo article below since it pertains to CBGs

"

When using piezos in a circuit, there are 2 things to watch out for. First, make sure you are using a high-impedance amplifier, and second, be sure to protect your amplifier. The source capacitance of a piezo element can vary from 500pF to 20nF, and creates a high-pass filter with the input impedance of your amplifier. So, if you want response down to 20Hz, you’ll need an input impedance from 15Mohms to 400kohms (Fc = 1/(2*pi*R*C)). If you use too small of an input impedance, only high frequencies will get through, which partially explains the ‘tinny’ sound that most people experience with piezo contact mic’s."

Comment by Matt Quinney on January 6, 2012 at 12:47am

Here is some technical info on piezos....

 

http://www.openmusiclabs.com/learning/sensors/piezos/

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