This adjustable frequency circuit was found in December 1986, Radio Electronics magazine. The base frequency is given by C1 and the power supply must be 5 V.
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...