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.
This circuit uses the 7815 regulator to obtain a voltage for motor control num shield for PC. The...
This 12 V to 110 V inverter with 100 W was found in a 1977 Signetics manual. The transformer must...
This basic version of the timer with the 555 was found in documentation from the 1980s. The relay...