5 Feb
2018
5 Feb
'18
1:02 p.m.
On 02/05/2018 02:06 PM, Chuck Guzis via cctalk wrote:
I was going to say...I would not have thought any USB-powered prom
programmer to be the best solution. I have two programmers both have their
own wall power connectors and they're reliable. I am not saying that it
would not be possible that an USB-powered prom programmer would work, but
I'd personally want to stick with something with some legroom. I always
measure my USB supplies and cables' output to separate out the ones that
don't provide enough umph from those that do.
Happy computing
Bill
On 02/05/2018 10:20 AM, Mark G Thomas via cctalk
wrote:
> 2) Many of the chips were failing to program because my Batronix
> programmer apparently requires more current than my USB port
provides.
> This surprised me because I have been
programming chips for years
> using this programmer on this computer port successfully, and this
> is the first I have had the problem. Using a Anker powered USB hub
solved
> things. My Batronix programmer even
arrived with a cheap powered hub
> when I ordered it, but I never used it because it was shipped with
an
> incompatible wall wart, but looking at it
in the box gave me the
idea
that
this might be the issue.
You should be aware that many "thin" Far East
USB cables will not pass
the full USB 1.5A current without substantial voltage drop. I recently
ran into this with a new LG portable DVD drive. It refused to operate,
even though I'd just taken it out of the box. I replaced the "thin"
USB cable with several other "thin" ones that I had with the same
result. Finally, in desperation, I located a "thick" USB cable, plugged
the drive in, and discovered that it worked just fine.
Moral: There's a lot of garbage out there.
Rant: The whole scheme of supplying anything but low-current using USB
is a terrible idea. I have a similar gripe with barrel connectors,
which don't seem to enforce any standard at all regarding polarity or AC
vs. DC.
For my own projects I've taken to using mini XLR connectors. Perhaps not
optimal, but they're rugged enough.
--Chuck My EPROM Programmers all have a connection foir
external power
specifically because sometimes USB can't provide the needed current.
bill