This circuit keeps a set of lamps permanently on, even when there is a power cut. The circuit can be adapted to use LEDs and the 12 V battery can also be changed according to the lamps or LEDs.
This is a basic and operational voltage comparator circuit. The circuit has voltages determined by the...
This circuit is from old documentation. The operational amplifier is uncommon nowadays. The...
This circuit is from an old technical documentation from Spain. The circuit uses a FET that is...