Osborne Vixen - Zenith 7" display t-shooting issues
drlegendre at gmail.com
Fri Nov 7 11:35:23 CST 2014
Chuck & All,
Hey, now +that's+ interesting.. I did look at the data for the MJE13007 and
while I'm not exactly up-to-speed on solid state stuff, the specs seem to
compare very well with the generic NTE 379 we've been discussing. And much
like the NTE, suggested apps include SMPS, inverters and deflection
circuits (I assume when they state the latter, "analog CRT" is implied?).
Likewise, the PHE 13005 also compares fairly well, though it seems to have
somewhat lower current ratings, both collector and base. The data
specifies "lighting ballast" and makes no mention of SMPS or deflection
service, though. I'm going to make a guess that it's not quite as fast a
switching part as the others.. or maybe the 'on' resistance is a bit
high-ish? But all three devices discussed have the same low beta, 8-10 min
/ 30-40 max.
Naturally, I binned half a dozen bad CFLs only a week ago..
So Chuck, if it were yours, I take it that you'd throw a 13007 at it
without a whole lot of further thought? It's looking very appealing, being
I can buy 10 of them for about $4.50 including shipping, and they clearly
have lots of other uses (like repairing SMPSUs and other small computer
On Fri, Nov 7, 2014 at 1:30 AM, Chuck Guzis <cclist at sydex.com> wrote:
> Well, Tony may have a problem with this one, but SMPSU transistors and
> HOTs do share a lot of common characterists. For example, instead of the
> NTE unit, consider the MJE13007, a old Motorola design that saw use in both
> SMPSUs as well as HOTs. Common as dirt.
> eBay, for example, has a BIN for 10 of them for less than $6 shipped.
> (item 140811430465).
> Compare the datasheets for yourself.
> P.S. I have a terrible, but relevant confession--I don't like to throw
> things out as long as they contain useful parts. For example, I accumulate
> bad CFLs then remove the lamp, extricate the electronics PCB, line them up
> out of doors over a metal pail and apply a heat gun to the trace side of
> the little pcb until the solder softens. Grab with pliers and bang each
> one against the side of the pail to allow components to drop out and then
> move on.
> Right now, I'm holding what fell out of the innards of a 20W CFL base.
> There are several power transistors with heat sinks, several inductors,
> diodes (of the 1N400x type), miscellaneous capacitors, etc. What makes
> this germane to the topic under discussion is that the base contained two
> NXP PHE 13005 transistors. Compare the datasheet with your NTE one.
> Like I said, common as dirt.
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