Field strength meter (CB8220E)

This passive tuned circuit was found in a 90s Popular Electronics. The coils must be according to the monitored waveband.

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Light Level Indicator (CB18640E)
This circuit fires when the light intensity on the sensor drops below a certain level. The trigger...
10 Channel Remote Control Decoder (CB9984E)
This circuit consists of a decoder for remote control that allows the activation of 10 channels based...
Simple Transistor Test (CB17139E)
This circuit is used to test PNP or NPN transistors giving the status indication through LEDs. The...