The SLB0686A integrated circuit used in this application is not currently common. The circuit is from a 90s Elektor, applying only to incandescent lamps.
With the precision given by the crystal this circuit provides signals of several frequencies for the...
This circuit was found in a 1977 Radio Shack documentation. The circuit is tuned to 1.4 kHz, but...
This sonic detector was published in Radio Electronics magazine in 1984. It consists of a motion...