This circuit was found in documentation from the 1980s. The circuit uses several components of the time, which are uncommon today. We must not supply it with a transformerless power supply.
We found this circuit in a 1987 Hands On Electronics. It was indicated at the time to power...
This amplifier, suggested by National Semiconductor (Now Texas Instruments), has high input...
This circuit causes one LED to light up if the voltage falls below the value set in R3 and the...