Visual metronome (CB21062E)

Based on the well-known LM3909, this LED pulser circuit was found in American documentation from the 90's. The power supply is only 1.5 V.

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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. |...