This circuit was obtained in a Hands-On Electronics from the 90's. The circuit turns on one LED at the end of the timer, erasing the other. The timing can be increased by increasing C1.
Found in General Electric's documentation from 1970, this circuit is indicated for the so-called...
This circuit is indicated to determine the flight time of an electric motor model airplane. The...
This circuit was found in a 73 magazine for radio amateurs of the 90s. The circuit uses two types...