This low power circuit for the FM band was found in a spy book from the 90s. The tunnel diode is not an easy component to obtain and the power can be supplied with a single button cell.
The presented circuit generates short pulses using a relaxation circuit with two complementary transistors...
This circuit was found in a Popular Electronics of the 80's. The NE602 functions as a heterodyne...
This circuit, from a 1988 documentation, makes successive actuation of the shower to control the...