LoFi Oscilloscope PCB

Another Forrest Mims classic. This time it’s a fully functional, albeit rudimentary, oscilloscope using a 10x10 LED “screen”. It’s really two circuit boards that stack vertically on top of each other. You could use wires instead of sockets and pins to connect it all, your choice. Circuit is capable of showing waveforms in real time from either an electet microphone or you can use a probe on some simpler circuits. Works with the human voice as well as music, 10x10 LED screen is rather low resolution (100 pixels) but it is still very cool and rewarding. Screen uses 5mm LEDs.