I have a few questions about piezo pickups with an active (9V battery) preamp. In a large body cbg, I’m thinking of installing a system with 2 piezo discs (or perhaps one under saddle piezo rod and one disc) wired in parallel to a blend pot (either mn250K or mn500k) and then to a 9V battery-powered active preamp with either two (1v 1t) or three (1v 1bass 1treble) volume and tone pot knobs. Here are my questions: (1) What value volume and tone pots do you use with a piezo/active system? 25K? 50K? 100k? (2) Have you ever installed an active preamp with piezo discs, or only with piezo rods? On a related note, ave you ever mixed rods and discs through an active preamp?

I realize I could skip the blend pot and use two volume pots, but that’s not my question, as I want to try with a blend pot. My main question is about pot values in a 9V active preamp piezo system.

For clarity, I’m going to build something similar to this item on eBay, except for a cbg instead of for a bass guitar: https://rover.ebay.com/rover/0/0/0?mpre=https%3A%2F%2Fwww.ebay.com%...

Thanks for sharing your experience!

Views: 149

Reply to This

Replies to This Discussion

Strangely, I don't think the value really matters since the pot will be used for blending.

What power doesn't come from one piezo will come from the other, so in essence it should balance itself.

Sorry, to clarify, I’m not asking about the value of the blend pot. I know I’ll use either an my 250K or mn500K for that. I’m asking about the pot values for the volume, bass, and treble knobs. See this picture of a commercial version of what I’m talking about. That’s what I want to build, except I want to build it for a cbg, whereas the one in the pic is for a bass guitar. https://rover.ebay.com/rover/0/0/0?mpre=https%3A%2F%2Fwww.ebay.com%...

With the preamp, you don't need separate volume/treble... the preamp does all that for you...

Given the high impedance of the piezo, I'd guess a larger value for the blend pot might be better, but Francois is probably right...   Truthfully, Piezo Rod is great, I don't see any advantage to adding a disc, unless you like handling sounds and feedback...

Hi. Thanks, but I am not talking about one of those big black preamp/equalizer units with EQ switches built in that we often see in acoustic-electric guitars. I’m talking about wiring one with knobs (aside from the blend pot, there probably will be 3 control knobs: a volume, a bass control, and a treble control). Also, I’m not actually asking asking about the value of the blend pot. I’m asking about the pot values for the other control pots, all of which will be knobs. See this picture of a commercial version of what I’m talking about. That’s what I want to build, except I want to build it for a cbg, whereas the one in the pic is for a bass guitar. https://rover.ebay.com/rover/0/0/0?mpre=https%3A%2F%2Fwww.ebay.com%...
One other note: Even though I am using piezo pickups, the system will not be high impedance, because it is a powered, active system. Thus, the pot values will be very different from what they would be if I were wiring a passive system that uses either piezos or magnetic pickups.

just make sure the blend pot is a linear pot and NOT an audio taper (log) pot. otherwise it will be difficult to get a blend you like..

Wise words.

The round piezo and rod piezo have different outputs(round piezo is louder and more likely to pick up all handling noise). If your using a preamp from Gitty, I believe these have only one input. This would require the parallel hookup making one louder than the other. 

So a blend pot between the round piezo and preamp input would work. You could use a standard volume pot and wire it: piezo signal to lug 1 of pot, lug 2 of pot to preamp and lug 3 of pot to ground. That will work as a blend.

As for the value of the pot: I would try a 500k first.

I obviously must not have asked my question very clearly, because everyone is responding about the blend pot value. I didn’t mean to be asking about the value of the blend pot. I’m asking about the pot values for the volume, bass, and treble knobs. Also, I’m not using an out of the box preamp that you plug into, from Cbgitty or elsewhere. I’m building one similar to the one you can see in this EBay pic, except that I want to build it for a cbg instead of for a bass guitar. That’s why I need to know the proper pot value for the control pots. Also, even though I am using piezo, the system will not be high impedance, because it is an active, powered system. Thus, the pot values will be very different from what they would be if I were wiring a passive system that uses either piezos or passive magnetic pickups. https://rover.ebay.com/rover/0/0/0?mpre=https%3A%2F%2Fwww.ebay.com%...
By the way, although I was not asking about the value of the blend pot, I agree that I’ll go with the higher value 500K blend pot, since the blend pot will be located between the piezo pickups and the onboard active preamp. The other pots, however, will not be located before the preamp, per the design in the eBay picture I attached.

I got that you weren't asking about the value of the pot to be used at that point, I listed it because of the impedance coming from that piezo being higher, the 500k would help to minimize that issue.

The pots for the preamp system are hard to determine without seeing a schematic. Stewmac and other places might recommend 25k pots for Battery operated preamp systems, but they are usually for EMG style pickups with built in preamps. The preamp your talking about could use a 1k, 10k or 25k pot or a mixture of values. So a schematic would be helpful.

While this article is primarily about pots in passive systems, from the one line about active (powered) systems, it LOOKS like I would need 25K pots. Does that seem right?
https://www.stewmac.com/How-To/Online_Resources/Learn_About_Guitar_...

RSS

The Essential Pages

New to Cigar Box Nation? How to Play Cigar Box GuitarsFree Plans & How to Build Cigar Box GuitarsCigar Box Guitar Building BasicsCigar Box Guitar Parts Store

Site Sponsor

Recommended Links & Resources

Forum

Slide off decals

Started by Will "KOOL DOG HOOCH" Bonner in Building Secrets, Tips, Advice, Discussion. Last reply by Will "KOOL DOG HOOCH" Bonner 3 hours ago. 3 Replies

30.5" scale lay-out help needed please!

Started by Will "KOOL DOG HOOCH" Bonner in Building Secrets, Tips, Advice, Discussion. Last reply by Will "KOOL DOG HOOCH" Bonner 3 hours ago. 19 Replies

What's on your workbench?

Started by Paul Craig in Other stuff - off topic, fun stuff, whatever. Last reply by Michael Fred Johnson 7 hours ago. 1155 Replies

Break angle for bridge

Started by Fantacone Box Works in Building Secrets, Tips, Advice, Discussion. Last reply by Will "KOOL DOG HOOCH" Bonner 17 hours ago. 28 Replies

Frets and fretboard

Started by Will "KOOL DOG HOOCH" Bonner in Building Secrets, Tips, Advice, Discussion on Sunday. 0 Replies

Fret Sides Dressing

Started by Brent Kasl in Building Secrets, Tips, Advice, Discussion. Last reply by Fantacone Box Works on Sunday. 6 Replies

Navigating this forum

Started by Fantacone Box Works in Performances, How to Play, Lessons, Concerts. Last reply by Fantacone Box Works on Sunday. 5 Replies

Blog Posts

Getting ready for next build

Posted by Sean Murphy on July 17, 2019 at 12:54pm 1 Comment

What wood is this?

Posted by Sean Murphy on July 16, 2019 at 10:48am 5 Comments

apology

Posted by Danny Gordon on July 13, 2019 at 7:30pm 3 Comments

Latest Activity

J.Rob commented on J.Rob's photo
Thumbnail

Mando build

"Thank you Thomas. Check out Jim Morris Mando builds,you will love them for sure! "
47 minutes ago
Smokin' Guitars replied to Andries D. EKER's discussion What Neck Shape do u use or like?
"  I've settled on ripping the playing portion of the neck down to 1.5", plenty for…"
1 hour ago
Smokin' Guitars commented on Nasty DeVille's photo
Thumbnail

DSC_00450

"Very nicely done, looks great!"
1 hour ago
Andries D. EKER replied to Eliah Holiday's discussion Anyone own one of the Lace CBGs?
"Agree on this they are up here at the local holesale store aswell verry verry exspencif you can get…"
2 hours ago
Andries D. EKER commented on Bill Turner (Wunkyman)'s photo
Thumbnail

ali cat

"Real nice how you got that cat in there, came to me in a second glance, did not get it when it came…"
2 hours ago
Smokin' Guitars commented on Smokin' Guitars's photo
Thumbnail

Build #8 pic1

"Build #8 One of my favorites. This uses a nice deep 6"x9" paper covered cigarbox and my…"
2 hours ago
Ricky liked AGP #'s photo
2 hours ago
Ricky liked CurlyBurly's photo
2 hours ago
Ricky liked Oli's photo
2 hours ago
Ricky liked Shane Speal shanespeal.com's discussion Project: Make this Folding Guitar Stand
2 hours ago
Smokin' Guitars posted photos
2 hours ago
Ricky liked Shane Speal shanespeal.com's discussion Easy DIY Cigar Box Guitar Stand by Eric Denton
2 hours ago

Music

Loading…

© 2019   Created by Ben "C. B. Gitty" Baker.   Powered by

Badges  |  Report an Issue  |  Terms of Service

\uastyle>\ud/** Scrollup **/\ud.scrollup {\ud background: url("https://storage.ning.com/topology/rest/1.0/file/get/963882636?profile=original") no-repeat scroll 0 0 transparent;\ud bottom: 25px;\ud display: inline !important;\ud height: 40px;\ud opacity: 0.3 !important;\ud position: fixed;\ud right: 30px;\ud text-indent: -9999px;\ud width: 40px;\ud z-index: 999;\ud}\ud.scrollup:hover {\ud opacity:0.99!important;\ud}\ud \uascript type="text/javascript">\ud x$(document).ready(function(){\ud x$(window).scroll(function(){\ud if (x$(this).scrollTop() > 100) {\ud x$('.scrollup').fadeIn();\ud } else {\ud x$('.scrollup').fadeOut();\ud }\ud });\ud x$('.scrollup').click(function(){\ud x$("html, body").animate({ scrollTop: 0 }, 600);\ud return false;\ud });\ud });\ud \ua!-- End Scroll Up -->