In fact, this circuit from the 60's applies to photographic printers of the time, timing the lighting of a 20 W lamp. The components are from the period.
This sophisticated workbench power source was found in 90s Radio Electronics. The maximum current...
We found this circuit in a publication for radio amateurs of 1976. The operational amplifier is a...
This circuit was found in the June 1991 issue of Radio Electronics magazine. The circuit uses two...