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 is the receiver for the previous circuit transmitter. Similarly, no information about the...
This circuit controls two LEDs that fash in an alternated mode. The circuit ws simulated in the...
This second-order low-pass Salen-Key filter was obtained from an American 1980s documentation. Formulas...