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 obtained from the 1995 Encyclopedia of Electronic Circuits Volume 5. The circuit...
This circuit was obtained in an old American manual. The circuit is valid for any operational. The...
This circuit is from Motorola documentation from the 70s. The transistors support modern...