This variable 1 A power supply with voltages up to 30 V was found in an article in June 1986 Radio Electronics magazine. The 723 IC is well known to magazine readers of the time and even today.
This circuit was found in an Experimenters Handbook of the 1990s. The purpose of this circuit is to...
This source, from a 1982 documentation, uses a triac to control the power and voltage applied to...
This circuit was found in the September 1984 issue of Radio Electronics magazine. The circuit has...