Found in a 90s documentation, this circuit appears in other configurations on this site. The circuit can be powered with voltages from 5 to 12 V.
September 2016 - Mouser Electgronics already has in stock the new moisture digital sensor HDC1010...
This circuit was found in a Radio Electronics of August 1952. The transistors are germanium types...
We found this Nicad cell charging circuit in an English publication from the 1970s. The circuit can...