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H-Bridge Minimum Voltage That Can Be Switched Answered

I am making a circuit that can switch the polarity of the output of my voltage supply at the timed intervals using a microcontroller. I am using a circuit similar to the one at this link: http://www.robotroom.com/BipolarHBridge.html. It works, but not at when the power supply outputs below about 3 volts.  Is there any way I can modify this circuit so that it switches the polarity all the way down to 0 volts?


use relays and you can switch anything.

Mosfets will improve things a bit, but you can't use these things down to zero volts - you may as well just use relays.