IVP wrote:
> Hi all,
>
> I came across this H-bridge circuit, a design I've not seen before
>
> The only comment is "Note the diode; this allows adequate base current
> from a regulated 5V supply. Have an LED if you are putting in the full
> 7.4V as an input, such as with booster transistors"
>
> Apparently it "works well with RC bots", such as this tracked tank
>
> Thoughts ? My first one was the losses in the Darlingtons
>
> Joe
>

My first thought was that the diodes are backwards.

Kerry

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