I looked into buying the OSMC pcb's from robot power. They will be out of stock of these for another 3 weeks, but Chris the owner (super great guy) told me...
How certain are you that your 40 boards will be correct? I don't recall if there was a package on the OSMC web site that can be sent directly to a board house....
Jeffry Sampson
jsampson@...
May 2, 2008 4:50 pm
2009
The OSMC with those HUGE EXPENSIVE FETs is way overkill for most anything, but battle bots. If I am not mistaken, you could run a 5 horse power motor with one...
... I find the OSMC convenient simply because it is a board that is ready to solder parts onto. I just don't put all the parts on my boards. If I can get these...
Jeffry Sampson
jsampson@...
May 2, 2008 5:52 pm
2011
... I would wait for several reasons. 1. Don't let your hobby become a business. 2. Palaces like robot power needs to see some income in order keep the boards...
Hi, I was wondering if there is any commonly available material would could be used to make a heat sink insulator (like for a transistor or voltage regulator)....
They make something called Sil-Pads http://www.google.com/search?hl=en&q=sil-pads You can get them in standard shapes like the mica equivalents. Here is big...
Jeffry Sampson
jsampson@...
May 2, 2008 8:46 pm
2014
Berquist is the company that makes silpads, there located here in MN. Everyone uses silpad type stuff these days. BE CAREFULL when ordering silpads from...
... If Jeff is in, I'll go in for 6 boards. I've got a Pololu board that I'm still getting around to using, but it would be fun to have some of these around to...
Hi gang, Got a question about the OSMC-- is it better/cheaper than using a surplus / used proprietary drive? Or new Gecko or Rutex? I suppose it is if you want...
... I guess it depends on your point of view. For the surplus commercial motor drives, most I have seen are quite large and require 100-220VAC. I run my stuff...
So an important question came up. What is available for motor drivers these days? Alan pointed out Pololu: http://www.pololu.com/catalog/category/11 New Micros...
I was wiring up some connectors for my red robot. I assumed commercially available RJ-11/12 connector would all have the same standard color wires on them....
Hi Jeff, ... <http://www.dimensionengineering.com/> sells the Sabertooth 2x5 and 2x25 (2 = 2 channels, 5 or 25 = amps) BDMicro sells the 50A Reactor: ...
A lot of us Midwest region R2 Builders have been using the Robotpower Scorpion XL. We do a lot of public outings with our droids, which means a lot of abuse...
... IFIRobotics sells much of the FRC kit, and they have the Victor 884 model: http://www.ifirobotics.com/victor-884-speed-controller-robots.shtml Pete...
Thanks for the well reasoned response, Jeff. I understand that there is something gratifying about "rolling your own" electronics. I just wanted to know if...
This page http://www.unimotion.co.uk/pdf/parker/oem670.pdf says that the 670/675 are for brushless motors. That can add a whole bunch of money to buy an...
Jeffry Sampson
jsampson@...
May 5, 2008 7:16 pm
2025
The OEM 670 and 675 (and Gemini) are for brushless-- but they can also drive brushed without any major hassle-- you just don't connect the halls, and use two...
http://www.parkermotion.com/manuals/OEM670/OEM670_UG.pdf p.28 and in more detail somewhere in the searchable engineering docs section of their site. I'm not...
There's PLENTY here to get excited about. MAN, there looks like there was some cool stuff out there. http://flickr.com/photos/tags/makerfaire/ My favorites so...
Now this is exactly what I was talking about for a statically balanced two wheel robot. http://flickr.com/photos/betsyphd/2470405726/ (Mine would be a little...
Jeffry Sampson
jsampson@...
May 6, 2008 3:55 pm
2029
Brian and I saw this thing. I think it was powered by the occupants, each with their own bicycle-style pedal. And the steering was done by differential power...
The first thing that I didn't notice is that you can get a larger version of the photo. I could see from that view that it has sprockets on the wheels and a...
Jeffry Sampson
jsampson@...
May 6, 2008 4:29 pm
2031
I saw an attachment on what I just sent. I assumed Outlook 2007 had screwed me by converting a link in my message to an actual inserted photo. But I see the...
Jeffry Sampson
jsampson@...
May 6, 2008 4:37 pm
2032
... about every other day :-) the other days, I think: how would I survive without computers?...
At the RSOH two weeks ago, we were discussing my boost converter design. I'm going to have a 24 v input. I have an atmel mega168 that I will be using to...
Terry Schumacher
Terry.Schumacher@...
May 7, 2008 3:57 am
2035
... Only if your converter will be running at farily low frequencies, less than 5KHz or so. Since a mosfet's gate looks like a capacitor, and its resistance is...
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