Blast from the past! I think I made this thing before I even started high school. Basically this is a very simple logic probe and reads a high/low voltage level as well as a PULSE! This was implemeneted using transistor logic but the coolest part is I etched the copper traces myself.

Knoweldge: Electronics • Interaction Design • My Hands • Trace Etching
Tools: Machine Shop Tools • Soldering Iron • Test Tools • Cutting Tools • Glue Gun