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 controls a heating element with voltage from 6 to 30 V and current up to 3 A from...
We found this Vox in a 1969 Motorola documentation. Transistors support modern equivalents and the SCR can...
Found in a 90s Elektor, this mixer makes use of integrated circuits of the time. The supply must be...