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.
This circuit consists of a power audio amplifier used in the modulation of AM transmitters. The...
The time constant of this circuit is 100 x R1 x C1, which leads to the possibility of obtaining times...
Figure Bellow shows how to use a 7490 (TTL) IC to divide the frequency of a TTL signal by 6; The...