---------------------------------------------------------- AeroElectric-List Digest Archive --- Total Messages Posted Thu 03/14/19: 2 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 03:31 AM - Re: Re: Three Questions on Z-07 (Henador Titzoff) 2. 10:17 AM - Generator troubleshooting & repair (David) ________________________________ Message 1 _____________________________________ Time: 03:31:01 AM PST US From: Henador Titzoff Subject: Re: AeroElectric-List: 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 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 _____________________________________ Time: 10:17:02 AM PST US From: David Subject: AeroElectric-List: 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. ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message aeroelectric-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/AeroElectric-List.htm Web Forum Interface To Lists http://forums.matronics.com Matronics List Wiki http://wiki.matronics.com Full Archive Search Engine http://www.matronics.com/search 7-Day List Browse http://www.matronics.com/browse/aeroelectric-list Browse Digests http://www.matronics.com/digest/aeroelectric-list Browse Other Lists http://www.matronics.com/browse Live Online Chat! http://www.matronics.com/chat Archive Downloading http://www.matronics.com/archives Photo Share http://www.matronics.com/photoshare Other Email Lists http://www.matronics.com/emaillists Contributions http://www.matronics.com/contribution ------------------------------------------------------------------------------------- These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.