This circuit was obtained in a 1980s publication, but it can be easily assembled today, as all components are common. The transformer is 12 + 12 V with at least 1 A and the diodes 1N4002.
Found in a Popular Electronics of the 90s this configuration can be seen elsewhere on our site....
This circuit for receiving or transmitting low power was found in old American documentation. It is...
This power supply can be implemented with a TIP32 providing an adjustable output at the 2k2...