Found in an old Popular Electronics, this circuit warns when a remote lighting system is not working. The circuit uses an LDR as a sensor and the components used are quite common today.
Bis This two-transistor circuit was found in the January 1994 issue of Electronics Now magazine. The...
We found this circuit in an old English documentation. The circuit can employ other gates and...
The circuit of the figure operates in an overtone of the crystal frequency, that is, in the...