This circuit also detects IR, providing LED indication. The circuit is used to indicate humidity in bench tests. We found it in the Radio Electronics magazine of February 1990.
This circuit was found in an English magazine from 1979. The magazine no longer exists, but the...
We found this circuit in a PopularElectronics of 1993. The circuit generates signals whose...
This circuit was found in an English technical documentation from 1973. The circuit generates...