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.
We have other similar setups on this site. This one is from September 1976 Radio Electronics. The...
This low voltage AC control uses a triac. Any TIC series triac can be used and this device must be...
Using germanium transistors, this amplifier provides a 540mW output power when powered by 9V. We...