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 circuit goes into operation producing a sound on a small speaker when the supply voltage...
In the figure we have two simple configurations of voltage doublers. Resistors and diodes are...
This timer was found in an English publication from 1979. The circuit can be powered with voltages...