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 a 1967 American publication, this circuit with feedback for two transistors has a gain of...
This circuit was found in an Elektor from the 90s. Next to the circuit we have a table with the...
In the figure we have the way to implement the E (AND) function with two inputs, in the case of...