![]() the H-bridge itself cannot modulate the power source to down the motor. An H-bridge made using relays (like the one we are making) cannot easily be used to change a motor's speed (unless, of course, the motor voltage is being supplied from a power source capable of being modulated. The best type of H-bridge is made with transistors since these can easily be used to control a motor's speed (by using the smaller voltage to modulate the much larger motor voltage). H-bridges can be made with either 4 relays or 4 transistors. These two separate voltage sources are kept isolated from one another. The other set of switches allows electricity to flow in the opposite direction.Īnother important characteristic of an H-bridge is that it typically can use a smaller voltage (5VDC from a micro controller, for instance) to control a much larger voltage (12VDC used to power a motor). One set of switches when closed allows electricity to flow one way. An H-bridge is a series of four controllable switches in which there are two sets of two switches.
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