This circuit was found in the May 1959 Radio Electronics magazine. Its purpose is to provide bias voltages for circuits under test. The circuit is isolated from the power grid.
This blinker for LEDs up to 500 mA was found in General Electric documentation from 1970....
This power supply was found in the 1996 Texas Instruments Linear Applications Manual. The circuit...
Using a CA3130 operational amplifier, this circuit drives an LED when the voltage exceeds the...