Does anyone make a bridge that will handle, say, in the order of 15 - 20
amps peak (stall)?  I haven't done a full load test on the gear head motors
that I'm going to use, but I know they can easily pull 12 Amps.

Happy Holidays,

Duane

-----Original Message-----
From: Roman Black [mailto:fastvid@EZY.NET.AU]
Sent: Friday, December 08, 2000 10:03 PM
To: PICLIST@MITVMA.MIT.EDU
Subject: Re: [OT]: Robotics with PIC16F877 anyone??


Dan Michaels wrote:
>
> Roman Black wrote:
>
> >Dan, there are two very cheap, common and good motor driver
> >chips, the BA6209 and BA6219. These are the same size as
> >L293 and are good for 1.2A and 2.0A respectively. We use them
> >all the time in VCRs. They have direction/speed control with
> >two input pins. Speed control is analogue. They are about
> >$1.50 to $2 US if you shop around.
> >
> >I have full datasheets if you are interested, or you can get
> >datasheets at
> >http://www.rohm.com/products/databook/motor/pdf/
> >
> >These are a great cheap little chip.
>
> Thanks Roman, I'll check these chips out. Probably need
> a big heat sink and external clamping diodes, I would imagine.
>
> How much trouble have you seen with motor noise getting back
> through this kind of chip to the uC pins? I imagine the problem
> is worse at the higher currents. Are you using any specific
> filters to deal with this? I was thinking it might be good idea
> to put RC filters between PIC and the L293 control pins to be safe.
>
> - danM

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