This regulator circuit is from Motorola documentation from 1969. It makes use of an integrated regulator of the time. With the indicated transistor, a current of up to 5 A can be obtained.
This circuit, which in our times would be called a shield, can also be used with other loads. The...
This circuit is from an old American documentation from the 70s. Transistor 2N3904 can be replaced by...
This application of the 555 was found in the November 1992 Radio Electronics magazine. The...