Found in an old Elektor, this circuit uses two 7-segment displays to indicate the volume of an amplifier. The circuit uses components that are still common today.
This circuit is from an American publication from 1975 and can use other operational amplifiers and...
With good filtration, a battery charger can be used as a power source. The filter shock can be the...
This voltage doubler is indicated for applications where a voltage equal to twice that applied at the...