This circuit was found in a 1985 documentation. It provides an audiovisual indication of the presence of moisture or water in the sensor. The circuit can be powered by voltages from 6 to 9 V.
This switched circuit was found in an old documentation and no information about the transformer...
We found this circuit in an old English documentation. The integrated circuit is of a specific type of...
This amplifying stage is found in several circuits on our website. The coils depend on the...