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 commercial transistor radio was manufactured by RCA in the 1960s. The circuit has only 4...
This circuit has a normally low output that is triggered by a high pulse. The circuit is from...
Suggested by a 90s Popular Electronics this circuit is intended to receive volleys or whistles...