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.
This circuit was obtained from the 1976 Siemens Integrated Circuits Manual. It is the circuit for...
We found this configuration in a 1974 publication. Transistors can be replaced with equivalents such as...
The values of R and C are fixed so that a time constant of the same order of magnitude as the...