This simple Water level controller circuit is useful to control the water level in a tank. It does this by turning On and Off a water pump depending on the status of the sensors.

This circuit varies the speed of a fan plugged into a 110- or 220-volt outlet using only three transistors and a few additional components

This DC motor speed controller allows you to vary the speed of small 3 or 6 volt DC motors often found in toys or small electronic devices.

This simple DC motor speed controller circuit, works with 12 volts and controls a DC motor using the 555 integrated circuit.

This water level controller circuit controls the water level in a tank. Unlike mechanical controls that use a floating buoy, this circuit uses two sensors, an upper sensor and a lower sensor

A very simple circuit that can be used to control the speed of an AC motor or the level of a room light using a TRIAC.

Very simple soldering iron temperature control system you can make yourself. It uses very few components. Ideal for DIY projects and circuits

This circuit allows us to control the temperature of a room, turning a heating device on and off. Very useful in winter and in very cold places.

This circuit allows us to apply voltage to a DC motor in either direction (forward or reverse) using a control circuit.

This circuit ensures that an elevated tank always has enough amount of water. Perfect for 2 or more stories buildings or houses

This circuit measures the temperature difference between 2 sensors and activates a relay when they are different. It is also possible to detect a temperature change, even when the two measured temperatures are normally different.

This circuit is designed to control the temperature of a room, either by using a heat source, such as an electric oven heater, or by using a fan or other cooling device.