This 80's circuit uses a germanium transistor like the AC121. The circuit has an output transformer of the type found on many transistor radios of the time.
We found this circuit in a 1987 Hands On Electronics. It was indicated at the time to power...
We found this configuration in a documentation for radio amateurs from 1974. The circuit can be...
In the figure we have a way of obtaining a 13,2 V with current up to 5 A using an integrated 7812...