This power supply for model railroad was found in a February 1961 Radio Electronics Magazine. The transistor must be mounted on a heatsink and the transformer is a 1,5A secondary winding.
The XR220 is a circuit equivalent to the 555 of the 1970s. This configuration from Radio...
Found in an English publication from the 1960s, this circuit uses period components, including the...
This circuit was found in Linear Circuits Applications of Texas Instruments, originally using the...