Low Frequency Doubler MC1556G (CB14564E)

This circuit is from Motorola's 1990 Linear Databook. The circuit employs a component that is no longer common today.

Motorcycle Alarm (CB6487E)
We found this circuit in a Popular Electronics of the 90s. The MOSFET can be of any type,...
Amplifier for the Deaf (CB12866E)
In fact, the correct name would be a hearing aid amplifier. However, we use the name of the...
Relay Flasher (CB11965E)
This circuit controls a relay causing it to open and close its contacts at a speed that depends on the...