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.
This simple receiver was found in a book on transistors from 1954. The coil determines the...
This configuration, quite common and found in other sites, is from European documentation from the...
The figure shows a simple way to obtain a negative voltage from a common source configuration. The circuit is...