Here are plans for an LED-based low frequency oscilloscope. The design is a compilation of notes from both Radio-Electronics articles published in 1992, Forest Mim's Electronics Notebooks and my own adaptation of circuit ideas. Lite-on LPT747 5X7 dot matrix displays were used (9 total) to make up a 315 LED display, although discrete LEDs may be used as a substitute.

Led scope

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Bill of materials may be found here

Square wave Square wave Square wave
Sine wave Sine wave Triangle wave

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Amateur Spectroscopy
Copyright© 1996-2010 by Randy Lauderbaugh