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 circuit was found in a Radio Electronics from May 1965. The transistor is a power transistor and in...
Found in an American paper from the 90's, this circuit can be adjusted to pass frequencies above 30 to 300...
This circuit is from a 1990s publication by William Sheets. The circuit consists of a stage whose...