Today's Message Index:
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1. 03:31 AM - Re: Re: Three Questions on Z-07 (Henador Titzoff)
2. 10:17 AM - Generator troubleshooting & repair (David)
Message 1
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| Subject: | Re: Three Questions on Z-07 |
As Joe said, electronic parts frequently go obsolete; however, "improved ve
rsions" aren't always improved.=C2- That's one reason companies keep engi
neers and quality control people around.=C2- I remember once when Vishay
obsoleted a part and replaced it with another part.=C2- We looked at it a
nd finally told our Air Force customer that the replacement part wasn't exa
ctly an improved version.=C2- The Air Force talked to the Vishay manufact
uring engineer and got him to change the company's plans to obsolete the ca
pacitor.=C2- I wasn't sure what they said to him, but our defense departm
ent can pack a wallop, especially since Vishay was in Beersheba, Israel. I
went there once with the quality manager to inspect their processes and tha
t's when we got the real story.=C2- I can't say publicly what the reason
was, but it had something to do with shekels.=C2- I do remember three of
our engineers allowing a similar change without alerting our customer and w
orking with them to accommodate it.=C2- When the AF found out, it wasn't
long before they were walked out the company door and possibly ostracized a
t other defense department contractors.=C2- I haven't seen any of them si
nce except one, and he started a company pouring concrete in our booming lo
cal commercial and residential industry.=C2- It isn't exactly high tech,
but he's making the big pesos.
For this application, though, Joe is correct in all statements below.=C2-
I particularly like the heat sink/conductive paste statement as temperatur
e beyond rating is a killer on electronics.=C2- I see heat sinks used wid
ely in today's products, especially since miniaturization has become the no
rm, but power dissipation (not consumption) remains high.
Henador Titzoff
On Wednesday, March 13, 2019, 11:02:36 PM EDT, user9253 <fransew@gmail.
com> wrote:
Electronic parts frequently become obsolete and are replaced by improved ve
rsions.
Search Mouser for part number DSS2x61-01A.
At the expected engine load, the diode will drop about 0.7 volts or less an
d could get hot consuming 10 watts of power.
Mount it to a heatsink using heat conductive paste.
--------
Joe Gores
Message 2
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| Subject: | Generator troubleshooting & repair |
I know this is off topic and not directly related to Aircraft electric but
you guys are so good I thought I would ask. Can anyone give me a learning
document/book on how generator heads work and how to troubleshoot them when
they stop producing power? When I take a generator head apart all the
windings look good I=99m just not sure how to troubleshoot the electr
ics to
determine what parts need replaced. I have gone through a half dozen small
generators and would like to give my kids an education in what to do with
it besides take the motor out and put it in a go cart.
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