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.
This stage circuitry for amplifying microphone signals makes use of germanium transistors as indicated...
In this circuit, the relay remains closed by activating a lamp, for a time that depends on the...
With this circuit we can demonstrate the operation of a Schmitt trigger using TTL logic. The...