This circuit, suggested by an Electronics World of 1969, keeps a blinking LED for a while when a power outage occurs. Time depends on capacitor C1.
When more current from a digital output is needed than a single output could source or drain, a...
This conventional astable uses two NPN transistor and was found in a publication of the year 1968. The...
The circuit shown is a constant current source which allows the reading of resistors on a very low...