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 beat frequency oscillator or BFO was found in an American 1980s documentation. The circuit is...
We found this setting in the Texas Instruments opto-electronics manual. The bipolar can be the...
This bistable control uses a 4069 as bistable. The circuit can drive relays up to 100 mA with the...