how can I test circuit continuity of twin piezo pick-up installation?

I bought by mail a couple of twin piezo pickups.  On inspection I found the cables connecting the discs to the pots to be so long that I couldn't install them into the narrow profile cigar box.  As I had a spare unit to use as a pattern at I decided to cut all the original cables and solder much lighter, shorter ones in their place.  Feeling very proud of my work I put everything together and tuned the guitar only to find it sounds fine as acoustic but no effect with the amp.  I have checked the pre- and amps work fine so the fault is in my soldering (?). 

Is there a way to find where the fault may be? Should I cobble together a battery powered circuit ....... or should I be swatting up on how to use a multimeter.  Many thanks.

(Isn't this a fab site So much info!)

Views: 296

Reply to This

Replies to This Discussion

What do the solder joints look like? Shinny or dull gray? Shinny is good, dull needs to be redone. Do you have a meter, harbor freight has them cheap! Did you keep the iron on the joints for any amount of time(more then 5 sec) if so it's possible that you cooked them. Post some pics.

Post a pic of your meter.

Hi Will and thanks for your interest.  The joints look nice and shiny to me,  and I was careful not to have the iron on the points for too long although it isn't thermostatic and does get fairly hot.  Hopefully the attached pics help and are clear enough.

Rgds

No pics. Use the little icon that looks like a mountain than attach file, where it says  pixel width, type in 150 then ok. Do that for each one. It is possible that you got crappy Piezos, it happens. Double check your polarity. The wire in the center(+) of the Piezo goes to the center lug of the plug and the one on the edge(-) goes to the ground lug, if those are bacwards you basically made them useless until rectified.

Hope this helps.

  1. Turn the knob to the position between 200 and pnp then follow the earlier instructions. No offence, but some of the joints are questionable. When you test the center scrap off a little of the white(just enough to touch probe) otherwise you aren't testing the joint! What are the values of your components? Cap, resister and pots.

Thanks for the tutorial; have tested each stage and joint; all seems well.  The pots are A500K and B500K made by Dilwe.  The small tab (resistor?) on the Tone pot has no text and the original advert on Amazon does not specify its rating.  If the hardware is near enough OK, is it possible the discs could be better placed?  One is directly under the bridge, the other about 3 inches up the neck but within the box as per picture.  I remain grateful for your interest.

Colin.

Have you tested through the pots? Your locations are ok. Do you have a way to un solder your leads from the pots and solder direct to a output jack then plug into your amp? Also check your patch cord. As a matter of fact try that first!

it is possible you have damaged the piezos themself if you put too much heat into them.  

put your meter on the 200mV scale and put the leads across the solder points of the piezos. now tap the piezo, not too hard and see if you get any reading on the meter.. you might have to drop to a smaller range. if you get nothing then its the piezo.

Thanks Tim, I couldn't give advice on testing piezos, because I didn't know, never dealt with them prior to building CBGs. Now I know. But I do suspect the Piezo, I "cooked" my first one thinking that they were indestructible. I also thought the same thing about 2032 button batteries, talk about pissing your pants! I'm glad I had my now defunct inspection magnifying light in front of my face. It definitely would have hurt. 

Two good ideas, tks guys.  They will have to wait until I get a new battery for the multimeter, though ! (thinks......how do I test the battery of a multimeter with a multimeter?  Pls  don't answer!)

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

PDF DOWNLOAD: How to Build a Hurdy Gurdy

Started by Shane Speal shanespeal.com in Feature Articles. Last reply by Philip Taylor on Thursday. 8 Replies

Pitch Pine

Started by Laurence Owen in Building Secrets, Tips, Advice, Discussion. Last reply by Laurence Owen on Thursday. 4 Replies

Samantha Fish oil can guitar

Started by Kurt Reifert in Building Secrets, Tips, Advice, Discussion. Last reply by Bruno Ballardini on Wednesday. 5 Replies

"Another' lid question.

Started by Will "KOOL DOG HOOCH" Bonner in Building Secrets, Tips, Advice, Discussion. Last reply by Will "KOOL DOG HOOCH" Bonner on Wednesday. 10 Replies

Pickup placing

Started by micky rooney in Performances, How to Play, Lessons, Concerts. Last reply by micky rooney on Tuesday. 9 Replies

Blog Posts

Mama Pearson's Soaporium

Posted by Rick Tish on September 14, 2019 at 8:52pm 0 Comments

Fresh Diddley Bow- "Why Not?"

Posted by Glenn Kaiser on September 13, 2019 at 10:23pm 1 Comment

Good weekend selling

Posted by Rick Tish on September 11, 2019 at 10:13pm 0 Comments

Cigar Box Guitar Music - Old time Blues

Posted by John on September 9, 2019 at 6:00pm 2 Comments

The Accidental Canjo

Posted by Poorness Studios on September 8, 2019 at 10:30am 2 Comments

Latest Activity

Myron Joe Hickel commented on John's group Radios turned Guitar Amps
"Hi, My name is Joe and I just joined a couple of days ago. I'm retired so I have a bit of time…"
1 hour ago
BrianQ. commented on Dave Lynas's video
Thumbnail

Ups & Downs

"Dave, you sure have been busy! I think you’ve got enough for an album already? Keep em’…"
1 hour ago
James Pobog replied to Bill Sheehy's discussion stringing up, my first build problem
"I have 2, a little clip-on with those different modes, and a Delta Lab chromatic (CT-40). When I…"
1 hour ago
John commented on John's group Three string guitars
"awesome!"
2 hours ago
Uncle John commented on Uncle John's video
Thumbnail

Third Hand Harmonica - Demo for that harp playing dude known as Buggy

"Thanks, BQ.  I could tell right away that is a pretty good harp.   AGP, yuck! …"
2 hours ago
Josh Thompson commented on High Bird Handcrafted Instuments's photo
Thumbnail

PSX_20190826_092043

"That is very slick, love it."
2 hours ago
Josh Thompson liked High Bird Handcrafted Instuments's photo
2 hours ago
Josh Thompson liked High Bird Handcrafted Instuments's photo
2 hours ago
Josh Thompson liked High Bird Handcrafted Instuments's photo
2 hours ago
John commented on Dave Lynas's video
Thumbnail

Ups & Downs

"No downs here...only ups!  Lovely tone Dave"
2 hours ago
BrianQ. commented on Rick Tish's photo
Thumbnail

plungerzilla

"Put a string on it  :D"
3 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 -->