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.
The circuit shown in the figure, activates a bar of 4 LEDs with an audio signal applied to its...
This simple experimental circuit, with a good external antenna can capture distant stations in the...
How to test a general-purpose diode Those who do not have a multimeter, or other instrument that...