Hi Paul,
Sorry for not coming back to you before, but I get my PicList emails at
work and do to heavy snow in the UK I could not get to work until today.

Your circuit will not work because if you look at the datasheet for the
L293 it says the control is TTL and also when you look at the min Vs it
says it can not be lower than Vss which is 4.5V minimum.

You will se here: http://itp.nyu.edu/physcomp/Labs/DCMotorControl#toc5

That they run it from 5V, which your motor will probably be able to do.

So to summarise your circuit will work but you need to have at least 5V
supply for the motor.

Best Regards
             Luis



-----Original Message-----
From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On Behalf
Of Paul Chany
Sent: 07 January 2010 19:39
To: piclist@mit.edu
Subject: Re: [PIC][TECH] Brushed DC Motor Application:
BidirectionalSpeedController - Is the schematic good?

Hi,

Paul Chany <csanyipal@gmail.com> writes:

> The motor has the following characteristics:
> I measured with multimeter the following values:
> no load current: 0,14 A
> stalled current: 0,66 A
>
> with two rechargable accumulators connected in series drived the
> motor and measured the following values:
> no load voltage: 4.3V
> voltage when stalled motor: 1.72V

So I created the schematics with gEDA, and the JPG image can be seen
here:
http://i520.photobucket.com/albums/w327/csanyipal/Bi-direct-Speed_DC_Mot
orControll.jpg

Please, tell me whether is it OK, or isn't?

--
Regards, Paul Chany
You can freely correct me in my English.
http://csanyi-pal.info

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