DIY Electronics

[daliad100]

http://www.mcmanis.com/chuck/robotic.../h-bridge.html

What does everyone think to this homemade speed controller?

I'm thinking of building one and am looking for opinions on it before going ahead.

Thanks, JB.

[muchalucha]

youll need a pic programmer and knowledge of programming microcontrollers and writing code in BASIC or C++ or something. Should be ok for a light feather weight but nothing bigger. If you have the facilities to make it then go for it , seems ok.

[psychostorm]

2 things to mention:

You will not save money building a speed controller yourself. Seems that way but doesn't work out in actuality.

That particular speedo can handle about 20 Amps. A good pushing featherweight can pull 25+. Also this has no current limiter so it'll let the magic blue/purple smoke out quickly..

[daliad100]

I'm just doing it as a project because I find it interesting.

Also I will probably change the FET's in it / parallel them so it can take more current.

[woody]

You might like to look at these.

http://homepage.ntlworld.com/barry.blyt ... ntrol.html

Regards Woody

[daliad100]

I've had a look at those speed controllers and they look a fair bit better and safer than the one I was initially looking at building.

Just a thought, would doing what someone has done for the steering on his R/C lawnmower (taken an ordinary servo, used it to drive an H-Bridge and used that to drive a motor with mechanical feedback to the potentiometer on the servo board) work as a speed controller if I were to remove the mechanical feedback and the centre the potentiometer/ replace it with a pair of resistors to effectively make it a modified servo?

http://130.94.182.150/mowers.htm - the link to above R/C lawnmower.

The making of the giant servo is under converting standard R/C servos into monster servos

[woody]

I've had a look at those speed controllers and they look a fair bit better and safer than the one I was initially looking at building.

Just a thought, would doing what someone has done for the steering on his R/C lawnmower (taken an ordinary servo, used it to drive an H-Bridge and used that to drive a motor with mechanical feedback to the potentiometer on the servo board) work as a speed controller if I were to remove the mechanical feedback and the centre the potentiometer/ replace it with a pair of resistors to effectively make it a modified servo?

http://130.94.182.150/mowers.htm - the link to above R/C lawnmower.

The making of the giant servo is under converting standard R/C servos into monster servos

Yup ..seen that link ..in fact it's been up on my steering servo page for years. http://www.teamonslaught.fsnet.co.uk/wiring.htm

Here's a similar approach.
http://www.rc-airplane-advisor.com/elec ... oller.html

and another

http://trebor69.tripod.com/speedcnt.html

Feel free to play ...but consider this ...there are not many ( if any ) homemade speed controllers being used in Combat Bots.

Regards Woody

[daliad100]

Thanks Woody.

This is going to be fun.

[muchalucha]

Feel free to play ...but consider this ...there are not many ( if any ) homemade speed controllers being used in Combat Bots.

Regards Woody

I use home made speed controllers