On 12/9/23 10:19, John Figie wrote:
Gene
Yes I understand the catastrophic failure mode of Buck converters. But what
is BBLB?
Built By Lowest Bidder, John. Slanguage I assumed everybody understood.
;o)>
I still have one or two of those, not in service except as proof of
concept maybe, with an output display even, $9.95 on fleabay at the
time. A couple decades ago now. I needed some 5 volts for a breakout
board, so it was more the smoke and aggravation than the money, worked
less than a year, replaced by a new breakout board and a 5 volt 5 amp
supply that is still running. With all the various pi clones running 3d
printers on those 5x5 supplies, I've 6 or 7 of those here now, zip
failures in 15+ years for some of them. Shopping on amazon, can
occasionally get them for under $15 yet. My biggest lathe started out on
an rpi3b running on its wall wart, 2 amp wasn't stable by the time the
interfaceing load was added but I put a 5x5 box in, and an rpi4b now
runs from long power failure to long power failure. Considering it's on
a 650 WS ups, and there's a 20kw auto standby in the back yard with a 5
second start to power output. the long power failures are me pulling the
plug to swap u-sd cards that boot it. I wish my wintel dells were that
good. All of the pi's and dell's also control all machine power from
the F1 key of LCNC, so they're never turned off, just the machines.
Those machines converted to stepper/servo's are also powered down by a
stepper loss of home, but while well tested, has never occurred mid job.
I'm in the middle of collecting enough stuff to rebuild my go704 4 axis
milling machine to use them. Costs maybe an additional $20 bill per axis
but well worth it. Runs much cooler, does away with pid's in linuxcnc
because the pid is in the smarter controller, They do exactly what the
TP tells them to do or stop LCNC in the next millisecond.
I'm also not a for profit shop, just a hobbyist, clearly with too many
hobbies. I'm a CET, (we teach EE's what they should have learned in
school), retired broadcast Chief Engineer in danger of falling asleep in
my diabetic & dotage years, 89 so far.
John Figie
On Sat, Dec 9, 2023, 7:39 AM gene heskett <ghesk...@shentel.net> wrote:
On 12/9/23 06:13, andy pugh wrote:
On Wed, 6 Dec 2023 at 16:08, Leonardo Marsaglia <ldmarsag...@gmail.com>
wrote:
Just a little update. We're going to try and feed all the voltages on
the
main board of the control (+5V, +15V, -15V, and 24V) with normal
switching
PSUs
Depending on the current requirements on each channel you might want
to look at using a single PSU and a bunch of buck or boost converter
modules.
My mill has a 2kw 24V supply and then 4x buck converters (with LED
voltage displays) to feed the PC motherboard, 5V and 12V logic.
Those tend to be BBLB stuff, and I've not had great luck. A to 5 volt
buck crowbared thru, putting the full 24 on the 5 volt stuff with the
expected results, lots of smoke. Lasted under a year, so I don't
consider it since.
Cheers, Gene Heskett.
--
"There are four boxes to be used in defense of liberty:
soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author, 1940)
If we desire respect for the law, we must first make the law respectable.
- Louis D. Brandeis
_______________________________________________
Emc-users mailing list
Emc-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/emc-users
_______________________________________________
Emc-users mailing list
Emc-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/emc-users
.
Cheers, Gene Heskett.
--
"There are four boxes to be used in defense of liberty:
soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author, 1940)
If we desire respect for the law, we must first make the law respectable.
- Louis D. Brandeis
_______________________________________________
Emc-users mailing list
Emc-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/emc-users
