This circuit for the 60 kHz range was found in 73 magazine and published in 1995. The circuit uses a ferrite rod. Note the direction of the coil windings.
The idea of wearables is not new and does not necessarily need to be implemented with...
This simple circuit was found in a 2001 documentation. With each touch of CH1, a 4017 output...
This circuit works with practically any tunnel diode, transmitting signals in the FM range with a...