This 3 A adjustable source uses the LM350 integrated circuit, which must have a good heat radiator. The circuit is from 80s documentation and has been explored in other versions on this site.
This oscillator for the fifth overtone of a crystal was found in a Radio Electronics magazine from...
Found in old documentation, this source uses an integrated circuit from that time, which is...
This power supply with only 4 components has basic full-wave configuration. The diodes depend on...