Need help on my first built UHU servo

[kfong]

Nice video John, 2010 should be an exciting time for you guys. It’s a small world. I’ve been busy with my ebikes and had created some boards to connect to the Dewalt battery packs. One of your fellow countrymen is working on providing transportation for the patrol officers on electric bikes and is evaluating my boards to see if it’s a viable alternative. Daniel Borden is his name. Nice to know I contributed a little to your Olympics. Thread on the boards I made
http://www.endless-sphere.com/forums...p?f=14&t=10986
The CNC's have been really useful for my ebike projects.

[bill south]

John;
Sorry to hear about the loss of your puppy!
Bill

[jcdammeyer]

That's pretty cool. Interesting use of Dewalt batteries.

John

[thaisolar]

Originally Posted by kfong Just use 10uf caps that surround the max232 chip. This will help with the charge pump. They are the ones on the board that are circular in diameter. The original data sheet on the maxim chips stated that the new ones can use 1uf. I suspect some of the maxim chips are not providing enough negative voltage. Uli used the Maxim chip for the negative supply on the op amp. A better approach would be an actual power supply circuit to provide the negative 12volts. Much more stable. Increasing the capacitors will allow the charge pumps to maintain a better voltage level. Kin

Thank you, I will try with your advice and let you know the result.

John, Sorry for the puppy. I also got the puppy but now not a puppy anymore. http://www.thaifila.com/Dynamite.html

[kayo]

Thank you for every one it very help full.

[MrWild]

Are both power supply grounds tied together?

[bill south]

Bill
A common ground should work fine as long as the voltages are there. Someone correct me if I'm wrong. I tried to return your pm but your box is full. Let me know if you have specific questions. I'm getting ready to fire up a new router using the old smartbaga uhu drivers. Wish me luck.
Bill