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Kondo Dave
07-03-2009, 06:00 AM
Hi there, havent posted in a while, been busy designing new parts and getting them made for prototyping before unveiling my masterpiece, well hopefully a masterpiece lol. I am looking to buy a bench power supply for my khr 2 and was wondering which one to buy that is cheap, reliable etc etc.
i found this one and wondered if anyone knew if this would be ok or if there are other optiohns?? I dont know much about the amps/volts , the technical stuff. But i do know that my batteries just are not good enough!

http://cpc.farnell.com/tenma/72-8350/power-supply-1-20-vdc-0-5a/dp/IN05540

Obviously i would need a kondo plug in thing connected to red and black on the bench power supply, I think???

In the process of making some gripping hands and new motions so need power for as long as i require.

Any help is greatly appreciated!

Thanks

Dave

Adrenalynn
07-03-2009, 07:06 AM
If you're only needing to run a few servos at a time, it'd probably do the job. Trying to animate the whole Kondo would result in blown fuses. 5A is just not adequate for running a humanoid.

Kondo Dave
07-03-2009, 08:14 AM
Ah, ok, I was looking to probably run the whole thing, to check say walking gaits etc as opposed to a few servos at a time. How/why would it blow a fuse?
What would you suggest to get to do the job ?

Thanks

Dave

Adrenalynn
07-03-2009, 01:50 PM
5A is just not adequate. You should be sourcing something in the 1A/servo to be reasonably safe. I'm not sure what the current draw on the Kondo's servos are. Do you have specs that would say?

ScuD
07-03-2009, 02:08 PM
You can get an 800 Watt 12V switching power supply from china for about 150$ excl. shipping.
That's 66 amps, you should be able to drive a few servo's off of that.

I've checked digikey but they're 460$ there, so that's a no-no...

You do not want to hook sensitive electronics up to the same supply without any decent bypassing and decoupling though... best to get a smaller, linear power supply in the 0-15V 0-2A range for that.

Orac
07-03-2009, 04:04 PM
I use one of these for my Manoi (almost the same as 2HV)

http://www.maplin.co.uk/Module.aspx?ModuleNo=30391

A bit pricey though

ScuD
07-03-2009, 06:10 PM
Hell, given the prices here in Belgium, that's pretty cheap actually ;-)
That's why I get most my stuff import from china, even with shipping and customs I get things a -lot- cheaper

Kondo Dave
07-04-2009, 12:27 PM
Hi, cheers for the help.
Orac i had a look at the link you posted and to be honest 100 is fine, if it will power my khr , well every servo. But what happens if i add more servos to the stock?
I mean if i bought that got it home i would then eb stuck.
I mean what settings do things have to be on etc etc.
I really wish kondo would release a constant power supply for their bots. I treally would be a lot
easier!!!!

Dave

Adrenalynn
07-04-2009, 12:38 PM
25A is going to power a _bunch_ of servos.

You would need to set the voltage using that dial over on the right. Never trust internal meters, always hook the multimeter up and confirm. That's about it!

Orac
07-05-2009, 05:08 PM
Hi, as Adrenalynn said, 25A is more than enough for anything you will need.

I had the 5A version of it as well, that worked ok for 90% of the trimming and setting up of the robot, usually working around 3-4A.

When you start to do things a bit more violent, the current limiter would cut in.

I like setting my current limiter to 4A anyway as I can keep an eye on the LED and know when my routines maybe unnecessarily strenuous, or when a Servo is about to blow !!!!

Adrenalynn
07-05-2009, 07:43 PM
Those must be extraordinarily wimpy servos on that thing! I didn't realize they were so underpowered.

Orac
07-06-2009, 07:56 AM
The servos can operate at 12V which means lower currents are generated.

Specs for Manoi servo (not 2HV, although they are similar)

Kondo KRS-4024HV
Dimensions: 433232.5(mm)
Weight: 48.5g
Operating Voltage: 9-12V
Stall Torque: 146 oz-in; 10.5kg-cm (at 10.8V)
Speed: 0.17sec/60 (at 10.8V)
Range: 260
Quantity: 17

Adrenalynn
07-06-2009, 12:53 PM
Ok - so they're basically 645's running at ~11v. I understand in large part why the Bioloid is so popular.