Pre selector with varicap tuning (CB9172E)

This circuit for the medium wave range was suggested by a Popular Electronics from the 90s. The double port MOSFET is an unusual component today.

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12 V Monitor (CB859E)
If the input voltage falls below 12 V the LED glows up. Other voltages can be monitored by...
Remote light sensor (CB7045E)
Found in an old Popular Electronics, this circuit warns when a remote lighting system is not...
Pulse generator 2 (CB8197E)
This generator is more complete than the previous one, being able to generate pulses as indicated...