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Old 2nd July 2013, 08:38 PM   #31
RipX is offline RipX  France
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Join Date: Feb 2013
Location: Nord (59)
It's a "piezo birdge" ! Thanks for your reponse friend
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Old 21st March 2014, 09:00 PM   #32
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Join Date: Mar 2014
Location: S love nia
Default Similar issue

ThumbUp for all you guys helping us, (two-left-handed LOL) amateurs!

I did some Google-work, and decided for following:

I am building DIY piezo pickup (from Donald Tillman), which is preamp built into guitar cable itself. Just ordered J201 JFET from China. This part is clear, no modifications wanted.
Preamp is divided in 2 parts, of which the 2nd part is 'Phantom Power Box' (also on the link above). XLR jack will be substituted with ordinary 1/4 jack, but this I think know how to do it, since there are 2 pins on XLR jack connected together...
1st question:
- to add output volume control, I think I should substitute R2 with variable resistor? Please some advice about this.
(IMAGE DIY Guitar Preamp - Power Box Modification 1.png)

Since I own Ibanez GA5WCE-NT classical guitar (similar to this one), which already has 9V active preamp (AEQ 303, which was 1st source of buzzing sound) with under-saddle pickup, it crossed my mind if I could use this to power piezo transducer (2 pieces linked together) pickup mounted inside of a guitar; then I coincidently found YouTube video from Peter Sesselmann, where he presents exactly this idea of mine (though he has external piezo pickup). There he mentions a mysterious 'passive mixer' - obviously 'hidden' A) inside 1/4 jack socket and B) under mounting mini-strap.
2nd question:
- from electronic viewpoint, is there really any need for passive mixer in such existing-preamp-to-diy-piezo-pickup formation? If I use my right-side brajn (logic that is), in such formation existing preamp powers piezo pickup 'automatically' and sends the signal to amplifier (though I use guitar-Zoom A2.1u effect - USB sound card input - compjuter (LOL) - USB sound card output - guitar amplifier (obviously in this case having a role of mono-speaker)). Just wondering... I will in any case test this out without 'passive mixer' (trial-and-error approach). What is bothering me (always!) is if any such actions of mine can have a dimming effect on any component mentioned in above link chain (burned out equipment)?

That's it for now, have some more thoughts...

Beer regards, sorry, I meant best regards,

Simon
S love nia
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File Type: png DIY Guitar Preamp - Power Box Modification 1.png (91.3 KB, 33 views)
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Old 22nd March 2014, 09:13 AM   #33
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Join Date: Mar 2014
Location: S love nia
Default Same issue Update 01

Regarding Question no. 2:
I have sent Mr. Sesselmann an e-mail, and he quickly replied that (QUOTE) "33k resistor Y connection , each signal (pickup) travels through a 33k resistor prior to being joined", with explanation that without seeing Preamp (the existing one on the guitar - AEQ 303 Ibanez) circuit this 33 k resistor should be a starting point.

Best regards,

Simon
S love nia
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