Found in a 90’s Electronics Now, this circuit has its output connected to an audio amplifier. The transducer is the type that fits on the finger to monitor the transparency and thus the beats.
This circuit triggers a relay when the detected humidity falls below a value. The system can be...
This circuit appears elsewhere on this site using the most diverse transistors. This version is...
We found this circuit in an American technical documentation from the 1980s. The integrated...