The purpose of this circuit is to indicate which of the two cars crosses the finish line first on a slot car lane. The circuit is from an 80's Popular Electronics.
The idea of this circuit from a 1960 publication is simple: we can switch the transistor being...
This project makes use of a technology without many digital components and that can be easily...
When the light falling on the sensor is cut off, the SCR fires, powering the lamp. Remember that...