This circuit was found in a 1971s English magazine. We can still assemble it using BC548 transistor. The other components are common. The supply voltage of 6 or 12 V depends only on the relay.
This circuit is from an Italian publication from 1988 but can still be easily assembled....
We found this circuit in a Japanese publication in 1967. The circuit consists of a 15 W audio...
This charger circuit provides an initial voltage of 2.5 V and when the current reaches 180 mA the...