This powerful transmitter for the 27 MHz band was found in a Japanese publication from 1961. The circuit is powered by battery and has the details of the coils given next to the diagram.
A touch or the simple approach of the sensor (metal plate) causes this circuit to emit a sound...
The circuit shown in the figure produces pulses of high intensity light at a frequency that...
This circuit was found in an English publication from 1976. It generates sequential signals in the...