This circuit is from Motorola's 1990 Linear Databook. We can implement it with other operational amplifier. The power supply must be symmetrical.
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...