Remote control tester (CB7823E)

This circuit from a 90s Electronics Now, uses a 4010 gate as a signal amplifier. The circuit triggers an indicator LED.

LED Flasher (CB11523E)
This circuit, found in a Popular Electronics from 1978, causes two LEDs to flash alternately for a...
Battery and Battery Eliminator (CB1406E )
The transformer inf this circuit is a 6 or 9 V unit and diodes 1N4002. The filter capacitor is 2...
Buffer for VFO (CB7282E)
This circuit was obtained in a Popular Electronics from the 90's. The gain depends on R4 and R3....