Let's Make Robots!

Suggestions for 10A H-bridge

I've got plans to use some 300rpm gear motors with a stall current of around 9A. I've been looking around at how to control them and some of the methods available are pretty pricey.

My initial plan was to use four chunky SPST relays I salvaged from work. Number one, they're enormous. Number two, they're relays. I have them and I'll use them if I need to but would rather not.

I found a schematic that uses MOSFETs in its design but I can't find it on google here at work. I have it saved at home. I'll add it later. I'm partial to it as the designer has actually made the thing and has a youtube vid to prove it. Should cost ~$10 per H bridge.

edit- Here's the schematic:


 


 

The webpage for the circuit is here.

 

If there's any other cheap DIY techniques you'd like to share, I'd like to hear about them.

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Then there is my design that is 100% FET and has variable electronic braking.

http://letsmakerobots.com/node/18633

Brilliant, I love it. Great features on that bad boy. Not only does that circuit use some pretty cheap components but it would let me tap into the stockpile of 339's that I ended up not using... hmm.

How in the hell did I miss that one too!? So much good info on this site. I wish the search engine could read my mind instead of vice versa.

1/2 mosfet and 1/2 relay...

http://letsmakerobots.com/node/2668

How did I miss that...