This circuit activates a relay after a time given by C1 and R1. The circuit is from a Radio Electronics from December 1974. The relay voltage is the same as that used in the power supply.
Using neon lamps, this regulator was found in a1969’s documentation. The lamps are types available...
In the figure we have the power supply for the 8 W amplifier in the previous circuit. The circuit...
We found this circuit in the April 1988 issue of Radio Electronics magazine. The circuit can be...