100 LED Oscilloscope This is my next build using LED matrix's. You may have seen my last one - 81 LED Chaser, well this project uses 100 LED's and is an oscilloscope!
Admittedly, the resolution isn't great for checking measurements (it is only 100 pixels!). However, it is fantastic at visualizing audio waveforms via a mic.
There are 4 IC's that make up the project. First there are the 4017 decade counter and a LM3914 LED driver which control the LED's. Next is a 555 timer for clock input and lastly a 386 op amp to increase the signal.
Do it yourself https://www.instructables.com/100-LED-Oscilloscope/
