Linear Amplitude Modulator (CB21087E)

Found in an Analog Devices documentation from the 90s, this circuit uses a component of the time, not common nowadays.

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. |...