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.
Found in a 90s Silicon Chip documentation, this circuit provides a current of 3 A and the voltages...
This circuit from Radio Electronics from February 1983 shows how to use a clock radio in home...
The circuit shown below was obtained from an Italian magazine Sperimentare from 1977. All...