This circuit provides a logic output signal when the voltage exceeds a certain value. The circuit is from the 1994 Linear Applications Handbook by National Semiconductor.
The LED is optically coupled to the LDR1 sensor to provide negative feedback to the circuit and...
The idea of this circuit is a resistance meter or continuity test with a common microammeter or...
This selectable constant current source was found in an English publication in 1983. The...