This alarm with sensors in series and parallel was found in the 1995 Encyclopedia of Electronic Circuits. The number of sensors can be changed at will.
Under this name, the popular electronic magazine of major/June 1969 introduced a simple...
This circuit was found in a 90s Radio Electronics. The FM encoder or multiplexer is an uncommon...
Found in an American publication from 1968, this circuit generates pulses at a rate of 2,500 per...