Solid State Guitar Amp Forum | DIY Guitar Amplifiers
Solid State Amplifiers => Schematics and Layouts => Topic started by: joecool85 on March 23, 2020, 02:46:49 PM
This is a super easy to build cable tester circuit with low parts count. I built mine with junk I had in my drawers. (Note the crappy quality stereo jacks being used as mono jacks since I don't want them in anything with sound going through them lol).
Here is where I found the circuit: https://www.diystompboxes.com/smfforum/index.php?topic=92973.0
Changes: I chose to omit the speaker. I also did it as positive ground (and flipped the LED connections accordingly) because I had an all metal dc jack I wanted to use and rigged it up for standard "pedal power" where the shield is positive. Lastly, I used 3mm LEDs and a 1k resistor instead of the listed 330 ohm.
No lights on means the cable is electrically open. Just the red LED on means there is a short. Both lights means you are in business!