This circuit was found in a Radio Electronics from the 90's. It provides lower frequency signals from a 10 MHz pattern generator.
This circuit uses a LM3900 Norton amplifier and a 2.7 V zener diode to supply a current of 1 mA to...
This simple circuit turns on a small lamp (or LED) when the light stops shining on the sensor for...
The LM123 series (223 and 333) is manufactured by several semiconductor companies. The circuit below...