This interesting circuit for SMD assembly appeared in the November 1987 issue of Radio Electronics magazine. The phonons are generated by selected resistors that are fitted to the assembly.
This circuit, which is part of a percussion instrument, was found in the September 1979 issue of...
The diodes are for general use and the transistors also in this Exclusive-OR circuit. The circuit may...
The frequency of this small transmitter, from a 1978 foreign publication, depends on the crystal. The...