Your good, Dave! these back of the napkin designs sometimes need a
little shakedown from a keen observer before the bugs drop out. That
didn't do much for smoke free operation (and my appetite). Hope
nobody fried their transistors cause of my stupid slip of the cursor.

The corrected schematic is posted here.

http://solarbotics.net/wilf/PSHbridge/hcBridge1.gif

wilf


--- In beam@y..., dkbovaird@a... wrote:
> Hi Wilf,
>
> I'm not too good with transistors, but this circuit seems to look a
> little funny to me. Perhaps you could elaborate on the operation a
> little more. It looks to me like both of the transistors on the
same
> side of the motor will be enabled at the same time causing a direct
> short.
>
> thanks,
> dave.