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 was found in General Electric documentation from 1964. It makes use of a PUT, called the...
The circuit presented is suggested by National Semiconductor in its Linear Applications Handbook. The...
This is a small transistor receiver for the medium wave range made in Japan in the 1960s. The...