This is the traditional H bridge configuration for motors. The circuit is for currents up to 500 mA, but with higher power transistors such as the TIP31 motors up to 2 A can be controlled.
This circuit activates a relay when the water reaches the sensors. The circuit is from a magazine...
The circuit, from Motorola's 1993 Linear Interface ICs, uses an unusual operating system today....
Decade counters, such as the 4017, can be cascaded as sourcing signals with the frequency divided...