This circuit triggers a small water pump when the humidity detected by the sensor is reduced in a flower bed or potted plant. The circuit must use a source according to the driven water pump.
We found this circuit in an American publication from the 90s. The transistors must be provided with...
The critical components of this project from a 1978 publication are the transformers, which can be...
September 2017 - Mouser Electronics already has the AP431S adjustable regulator from Diodes...