Re: [CAD_CAM_EDM_DRO] Gecko 5V supply

Hi Tom,

Weird Stuff in Sunnyvale, CA has them for $5 "in the back". I don't
know what they sell through the mail.

http://www.weirdstuff.com/

Alan KM6VV


Tom Eldredge wrote:

>
> Gentlemen,
>
> Where can you get cheap 5volt wall warts? I see the 4.5 and 6 volt ones all
> the time, but 5v? They seem to run around $25.00 USD. I can get a used PC
> power supply for 5-10 USD. And that is a regulated power supply with a
> chord and power off switch.
>
> Tom Eldredge
>
> Tom Eldredge
>
> Tom Eldredge
> ----- Original Message -----
> From: Alan Marconett KM6VV <KM6VV@...>
> To: <CAD_CAM_EDM_DRO@yahoogroups.com>
> Sent: Monday, April 02, 2001 1:16 PM
> Subject: [CAD_CAM_EDM_DRO] Gecko 5V supply
>
> > Hi Jesse, Brian, Mariss,
> >
> > I just might have to disagree a little with that statement! Most U.S.
> > cars have the negative side of power connected to the frame of the car!
> > The negative side of a PC's power supply is connected to the chassis
> > ground (probably at one point). On the other hand, the series connected
> > 120 or so lead-acid cells in the battery wells on the submarine I was on
> > WAS floated from "chassis" ground! The electricians were VERY careful
> > not to short out one of THOSE cells!
> >
> > (and on Brian's post)
> > The PC's 5v power available through the joystick connector PROBABLY has
> > a fuze (The better boards), just like the keyboard port is supposed to.
> > As the traces on a PCB are quite thin, I doubt if you'd be able to pull
> > 25A anyway. But a good warning!
> >
> > NOT that I consider PC power the best choice. Several years ago, I was
> > rigging up a driver for a stepper motor system (wires strung all over
> > the office), and had one external open frame power supply driving the
> > stepper fall into another (where's that cat). When I came in the next
> > day, flipping on the power gave me a big flash! :>( I fried the driver
> > module, the CY525 controller, and the parallel port board. The PC
> > finally came up after I removed the fried parallel board. It limped
> > along, and really didn't run right after that (it was subsequently
> > retired).
> >
> > The lesson: you NEED isolation from the PC! I suggest a 5v wall wart,
> > and leave the PC's 5v for things like joysticks, mice, hand scanners and
> > keyboards.
> >
> > Yes, I'd have to agree with Mariss! Not much electrocution danger from
> > 5v. And I must say, the Gecko's are GREAT DRIVES! I just wired up my
> > first pair of 201's, and found them to be VERY easy to use! Much easier
> > then the SD200's I had seen in the past. Although I mounted the pair on
> > a 6x6x1.5" finned heatsink, they run perfectly cool (37v, 2A)! I did
> > find out that I'll need a LOT more steps to make them spin FAST! Guess
> > I'll be going to EMC on a Pentium faster then I thought! (But how does
> > one get the little covers off? Even after pulling off the terminal
> > blocks, it only slides back so far. Wouldn't want to bend it!). Again,
> > I am greatly impressed by these drives! Thank you Mariss!
> >
> > (An idea)
> > Did you know, "Surplus" 24v linear power supplies, with "fried"
> > regulators, are available cheap, and with the regulation stripped out,
> > can provide about 37v for a stepper driver! Try to find one with a 6A
> > rating, 4A might get by.
> >
> > Alan KM6VV
> >
> >
> > jesse wrote:
> > >
> > > On DC power circuits neither side is grounded. So both the + or - buss
> has zero potential to ground. Years ago when I was running
> > > diesels generating DC power for electrolytic hydrogen it was normal
> to feel the bolted buss connections looking for hot spots.
> > > It took watching someone else doing this a few times before starting to
> do it. Just don't grab both busses at the same time.
> > > I would have to do some checking before I did this on electronic
> systems.
> > > Jesse
> > >
> > > mariss92705@... wrote:
> > >
> > > > Hi,
> > > >
> > > > Most PCs have a game port. The +5VDC is available on pin of the game
> > > > port. You cannot electrocute yourself off of 5 volts even if you put
> > > > the wires in your mouth and stand in a tub of salt water. Haven't
> > > > tried it myself but I am sure.
> > > >
> > > > Mariss
> >
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