This is the essential tool in every ones tool box
for fhen designing or fixing any digital circuit. The circuit is build around lm339
voltage comparator with selection switch for TTL and CMOS circuits.
The case files have opening for 3 digit 0.36 voltage meter that are available
through eBay or Aliexpress.
Very easy project for any beginner.
Versions of the boards are available on our
Tindie store
Documents
Schematic
PCB (easyEDA)
3D Top STL file (LED)
3D Bottom STL file