Society of Robots - Robot Forum

Mechanics and Construction => Mechanics and Construction => Topic started by: BANE on March 10, 2008, 11:09:51 AM

Title: using cheap servo circuit as regular DC motor control?
Post by: BANE on March 10, 2008, 11:09:51 AM

Hello, just had an idea bout using a circuit from a old cheap servo to control a regular DC motor.  However, i dout that you would want to control a 6v motor with it.....   so I was wonding if there is anyway to amplify the circuit w/ additional battery, mayby 12v?

Bane

Title: Re: using cheap servo circuit as regular DC motor control?
Post by: cooldog on March 10, 2008, 11:17:13 AM

all servos are are a dc motor and the circut :P

with some gearing

Title: Re: using cheap servo circuit as regular DC motor control?
Post by: ed1380 on March 10, 2008, 02:44:37 PM

i cant find it right now, but there are guides on how to take a servo board and add some transistors for a motor controller. but IIRC it's only one directional

Title: Re: using cheap servo circuit as regular DC motor control?
Post by: izua on March 10, 2008, 02:45:40 PM

get a hbridge and it's bi. directional of course :P

Title: Re: using cheap servo circuit as regular DC motor control?
Post by: BANE on March 11, 2008, 10:52:56 AM

you mean just use a dual h bridge instead of a servo circuit?

bane

Title: Re: using cheap servo circuit as regular DC motor control?
Post by: ed1380 on March 11, 2008, 12:58:58 PM

all you need to know
http://www.societyofrobots.com/schematics_h-bridgedes.shtml

Title: Re: using cheap servo circuit as regular DC motor control?
Post by: airman00 on March 12, 2008, 05:57:37 AM

Quote from: BANE on March 11, 2008, 10:52:56 AM

you mean just use a dual h bridge ?

bane

well yea , thats basically whats in the servo 

Title: Re: using cheap servo circuit as regular DC motor control?
Post by: BANE on March 12, 2008, 10:54:14 AM

Quote from: airman00 on March 12, 2008, 05:57:37 AM

Quote from: BANE on March 11, 2008, 10:52:56 AM

you mean just use a dual h bridge ?

bane

well yea , thats basically whats in the servo 

You know i opened up one of my servos a while back and saw something like a long black bar thing with a few pins coming down, is that the bridge?

bane

Title: Re: using cheap servo circuit as regular DC motor control?
Post by: airman00 on March 12, 2008, 05:23:16 PM

ye it is the bridge]

but you should just get the L298 motor driver and use that , it also uses PWM