This circuit was found in a PC documentation from 1996. It can be used as a shield with modern microcontrollers.
This circuit uses two sensors that are placed at the intersection of a miniature railroad, causing the LED...
I found this circuit in an English magazine from July 1982. The circuit is still viable because all...
Microchip's MCP6411 Operational Amplifier can operate at voltages of 1.7 V and has a quiescent...