I would certainly need more info about how you have things connected,
but off hand I'd agree with Richard in that your motors are most
likely drawing too much current.
You can test this theory out by connecting an ammeter in series with
one of the motors and the battery (seperate from the Sumo11 of course)
and see what kind of current it reads. Be sure your ammeter is set to
the 20 amp mode though.
What kind of motors are they?
-Dan



--- In Sumo11users@yahoogroups.com, "johnabshier" <johnabshier@y...>
wrote:
>
> At one level I know what I did, I let the magic smoke out of the motor
> driver. I had a 9 volt transistor battery to power the electronics
> (measured voltage 8.4) and a 9.6 volt RC battery for the motors
> (measured voltage 11.3). Turned on power switches; saw/smelt smoke;
> disconnected everything. Visual inspection of L293D looks bad; no
> longer flat on top. Measured resistance across motor power leads is 5
> ohms. Rewired power to use transistor battery for both electronics
> and power. Ran the Sumo11 test program (IC 5.09) with no motots
> connected. With motor power switch off the led's light up in expected
> sequence for the test. Turn on the motor power switch and the system
> resets. I can get and replace the L293D. What else should I check/do?
>