Heterodyne Mixer (CB4291E)

This is a typical 80's FM radio mixer circuit. The circuit was found in a documentation of the time.

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Automatic Lighting Control (CB15752E)
The original purpose of the figure circuit, suggested by National Semiconductor, is to keep the...
Active Cut-Out Amplifier (CB15422E)
The amplifier shown in the figure was obtained from the Anlog Devices linear integrated circuits...
Alarm (CB196E)
When the sensor X1 is opened, the relay is energized. When waiting, the current drained is very...