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 resonant circuit depends on the crystal frequency that can go up to a few megahertz. The...
This circuit is from the 1983 Intersil Databook. The display is plasma and must be excited by a...
This is a typical common emitter amplifier stage configuration. The transistor can be used...