Radar detector (CB8628E)

Found in a 90s Electronics Engineering, this circuit makes use of components of the time. The critical component is the microwave sensor diode.

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LED VU (CB22157E)
This circuit was found in a 1989 publication. The operational amplifier supports equivalents. The...
Humidity sensor (CB6953E)
This humidity sensor indicates the different levels of conduction of the sensors through an LED...
Light level control (CB20718E)
Found in documentation from the 70s, this circuit uses components from that time. Some of these...