This circuit was obtained in an Electronic Engineering of the 90s. The operational amplifiers and the sensor are from that time. The circuit has symmetrical power supply.
This circuit is from 1995 documentation. It consists of a battery of 4 instruments driven...
This circuit was found in a 1974 English magazine. We can also assemble it using BC558 transistor for...
Found in Motorola documentation from the 1960s, this timing circuit can last up to 10 hours with...