A simple, but quite useful upgrade to my TC1 Multi-Function Tester.
I added a 3mm stereo jack, connected to the test socket pins 1,2, and 3.
![](https://www.eevblog.com/forum/projects/simple-upgrade-to-a-tc1-multi-functuion-tester/?action=dlattach;attach=405562;image)
![](https://www.eevblog.com/forum/projects/simple-upgrade-to-a-tc1-multi-functuion-tester/?action=dlattach;attach=405564;image)
![](https://www.eevblog.com/forum/projects/simple-upgrade-to-a-tc1-multi-functuion-tester/?action=dlattach;attach=405566;image)
Then made a few test leads with 3mm plugs and various probe clips to use with it.
It adds a few pF capacitance, but that can be allowed for.
![](https://www.eevblog.com/forum/projects/simple-upgrade-to-a-tc1-multi-functuion-tester/?action=dlattach;attach=405568;image)
![](https://www.eevblog.com/forum/projects/simple-upgrade-to-a-tc1-multi-functuion-tester/?action=dlattach;attach=405570;image)
![](https://www.eevblog.com/forum/projects/simple-upgrade-to-a-tc1-multi-functuion-tester/?action=dlattach;attach=405572;image)
(Just don't use a metal plug like I dumbarsedly did.)
A video about it:-