Melody Generator (CB25350E)

Based on an LS3404 this circuit was found in the July 1990 issue of Radio Electronics magazine.

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Infrared Emitter (CB15729E)
The purpose of this circuit is to 'produce a beam of infrared rays modulated at a frequency that...
Cable Tester (CB16567E)
The circuit shown is intended for cable testing, providing status indication via LEDs. The number of...
Temperature to digital converter (CB21287E)
This '90s circuit found in National Semiconductor documentation uses components from the time. |...