This circuit is from 2005 documentation. The integrated amplifier circuit must be mounted on a good heat sink and the speaker must be able to withstand the full power of the circuit.
This small unregulated variable power supply was found in an American book from the 60's. The...
This circuit indicates when the voltage of a 12 V battery is low. With changes, for example, the...
This basic circuit is from 1984 documentation. This circuit can be used as an efficient burglar alarm...