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 in a 1990 documentation and can be powered by the previous circuit...
This RF amplifier step has a dynamic range of 140 dB and can amplify signals from 0.5 to 40 MHz....
This oscillator with different outputs has frequencies selected by the S2 switch in 3 bands. We...