This circuit also appears elsewhere on this site, obtained from other sources. This is an 80's American schematic book. Instead the lamp can be used white high-brightness LEDs.
The presented circuit can excite small piezoelectric transducers or ceramic buzzers. These...
This simulation shows how to use an operational amplifier as a voltage comparator. The sample uses the...
Maxim MAXREFDES67 Universal Analog Input Micro PLC is ideal in factory automation because of its...