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 low-cost MW receiver is from the SGS linear integrated circuit manual. The coil wire can be...
Here is a high-quality intercom for demanding readers. The circuit is from a 1982 documentation. Of course,...
With this circuit, a relay can be activated from an alternating signal with frequency up to a few...