Tri-cord Tester?

[djmiyta]

Anybody have one or use one . I found my old Craig Anderton Tri-Cord tester from 18+ years ago. Wanted to see what kind of mess inside that allowed it to still operate.This was before I started etching my own boards. Crude? Yes. Works? Yes. Usable? Very. It can detect intermittent problems. Pretty easy build too.

 

[cooder]

Cool, have you got the original schematic by any chance? Cheers!

 

[djmiyta]

Cool, have you got the original schematic by any chance? Cheers!

I’ll have to do a bit of searching and as soon as I find it I’ll upload it here

 

[Stickman393]

Copyrighted material...from the projects for guitarists book.

Here's my own schematic, based on the Tri-cord checker. I call it, the cri-tord. Work in progress.

 

[djmiyta]

Yep that’s the one. Works pretty good

 

[Chuck D. Bones]

BTW, the IC is a CD4001. You could also use 4 of the inverters from a CD4049.