This 2.5 A power supply was found in a 90's QST magazine. The power transistor must be mounted on a heatsink.
This control for 1200 W of power was found in the documentation of General Electric of 1966 has a...
I found this circuit in an old English magazine from 1979, but it can be easily assembled with...
This circuit imitates the singing of a bird intermittently with the intermittency determined by C1...