Found in a 90s Popular Electronics, this circuit can power a miniature railroad with voltages of 15 V and currents up to 1 A. The circuit has soft start effects.
This circuit is from a Radio Electronics from March 1970. The crystal depends on the frequency at which...
This circuit was found in a 1960 transistor manual from Sylvania. It measures the intensity of...
This audio mixer was found in an old American documentation. The potentiometers are 1M and the...