Band Switch (CB21254E)

This switch or band selector for receivers was found in a Popular Electronics from the 1990s. The circuit uses a PIN diode.

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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. |...