We found this circuit in an old documentation. Its purpose is to turn on warning lights when the vehicle in a garage touches or passes a sensing bar preventing it from hitting the wall.
The circuit is from National Semiconductor's Linear Applications Handbook. The operational...
This circuit is old, causing LEDs to be lit sequentially. Several types of games can be programmed using...
This circuit of the 70's uses transistors of the time. The circuit can amplify signals from 10 Hz...