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.
In this circuit, which uses one of the four comparators of an LM339 (or LM139 or 239), capacitor C1 and...
This timer activates a relay after a time interval of up to 15 minutes has elapsed, starting from...
This inverter can reach a power of 300 W depending on the transformer used. In this case, a...