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.
This is a basic inverter circuit for a 70 kHz crystal. We found it in an old documentation using an...
Found in an American documentation from the 90's, this circuit aims to light a neon lamp with...
This circuit is from an old RCA documentation. The circuit sources a charging current of 1 A and...