Variac power supply (CB22468E)

We found this circuit in a Popular Electronics from 1992. The circuit shows how to use a variac in a benchtop AC power source.

5 V x 15A Regulator LM323 (CB15320E)
With a boost transistor this circuit supplies currents up to 15 A. Equivalent transistors can be...
Two SCR dimmer (CB7206E)
This circuit was found in a Motorola Manual of 1965. The circuit has neon lamps as trigger...
Regulator 5 V x 10 A LM109 (CB14504E)
The LM109 integrated circuit has been manufactured by many semiconductor industries. The circuit...