This circuit was obtained from an 80's Electronic Engineering. The circuit detects ice formation by triggering a warning light. The operational amplifier is of the time.
The configuration of this circuit was suggested by an old English publication that comes to...
Some old analog multimeters use a 22.5 V battery for high resistance measures. These batteries can no...
This circuit was found in 1968 General Electric documentation. The circuit uses components from the era...