Home Motor drivers About H-bridges 6-trans. Tilden H-bridge "Full-featured" H-bridge Wilf's reversing H-bridge Buffered H-bridges Bolt's 4-trans. H-bridge The Z-bridge 74*245-based driver 74*240-based driver 74*24x drives compared Stepper motor drivers Solar engines Sensors Complete robots Misc. circuits   The BEAM Circuits Collection is a BEAM Reference Library site.		Wilf Rigter's reversing H-bridge Design, limitations, usage This H-bridge variant was one of the first in which the reversing circuitry is built into the driver, rather than (as is more-commonly done) into the control circuitry upstream of the driver. This is a handy circuit, though, for 2-motor walkers -- as all that is required to reverse one is to reverse the phasing of one of the motors. Wilf revisited this design in Yahoo group post #31505; he adds (since the CD4016 is an obsolete part, and unlikely to be found) "If you use Vcc > 3V or use a 74HC4066 instead of the CD4016 then add a 220 - 1K resistor in series with the base of each 2N2907. "
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