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Want More power from a "standard" servo? LOOK HERE

K

Krod_Clod

Pebble Pounder
Joined
Feb 26, 2004
Messages
127
Location
Pittsburgh PA
Hey guys, havent been around much lately (sold the gecko, and got into heli's for a while). BUT I've had this bookmarked for my own use and thought you guys might want to take a look.

Not 100% sure that it fits our needs, but from what i read about them...they are PERFECT for something like a hitec 645mg servo that already has a strong gear set, but just needs some more power and torque. With everyone having such trouble with the new titanium geared robot servos, i thought this might be a better solution. Cheaper too!

A sneaky way to possibly get more balls out of a servo....and only $20.00

e-clec-tech_1832_14125686

http://www.e-clec-tech.com/smodr1.html


Specs here...via PDF
http://lib1.store.vip.sc5.yahoo.com/lib/e-clec-tech/L293DSMD.pdf

Later on
-Matt
 
I think its designed to be an "upgraded" board for the servo. ie it can take more voltage, higher current etc... than the standard boards in our servos. Basically "boosting" the servo's power

It is a 5 wire hookup, so i'm not to sure how we can get around that (making our PWM receivers work with this setup. But if we can get it to work...it would allow you to run 7.2 (really up to 12 volts) directly to the servo without the expense of a $100 robot servo.
 
is this what they use in the helocopters? if so maybe could use a helocopter speed controler.
 
Its not used in helicopters....as a speed control anyway...


It replaces the standard "board" in your servos with one capable of working with more power.
 
Krod_Clod said:
Its not used in helicopters....as a speed control anyway...


It replaces the standard "board" in your servos with one capable of working with more power.
Click to expand...

ya i understand it replases the servo sercit board. oh well if i cant figure out somthing. i know my dad can since he was a electrical technitian for 26 years :shock:
 
I am reading this correctly this will fit into a Cirrus cs-80 right? i burned mine up :?
 
Most guys who use servos controlled by a microcontroller, like a Basic Stamp of 68HC11, and up having to write commands to control a servo the same way that our Radios do (PWM). It looks to me like someone just hooked an hbridge motor controlled and gave some simplified inputs. It doesn't look like you would be able to operate it like a servo (with feedback from the pot). It looks to be wire just like a motor. Sumo robots guys do this sort of thing all the time.
 
wow all that tech talk ment nothing to me. So has anyone tried this? does it work? how well did it work? was it worth it? sorry for all the questions ive just been looking for somthing like this to come around for a long time but i dont want to just blow 20$ and not know if its going to work. thanks
 
well its certainly not a direct replacement for your "average" rc servo board. You'd need to know your way around the circuit pretty well to make sure everything works. Really all this board is doing is giving your servo the ability to handle up to 20+ volts without melting the board down. (i thought that was one of the problems with the new digi hitec servos that make 333oz/in of torque???)
 
I've worked with microcontrollers

The L293D is an h-bridge ,normally used for running DC motors.

When used in Robots,hobby servos are "modified"..which means they have their feedback potentiometer stripped off.
You get no position control in such a setup,the servo keeps moving through the 180 degrees it normally travelled.

If you wodering why would any one do such a thing to a servo,it's because servos are powerful "geared" dc motors and have a good torque to weight ratio ,pretty for small robots.

The link at the bottom reads this..
"...If you plan to install this into a servo; the servo will also require modification......"

I just got my txt-1 ,converting it into an autonomous robot..makes a nice platform...
You can have a look at some of my machines ,check my sig.
 
ok ok...
But its a real neat platform..
Looks like i wont be coverting it into a robot....
Just ordered 2 cs-80's and a gd600 drive.
 
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