K2 Diffuser Again
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The build of K2 #6358 has hit a road block!
I have a couple of questions concerning the backlight/diffuser: 1. The leads are too short. About a week ago Gerard, PA3GP, proposed extending the leads by soldering short extensions. He got no responses so I assume this is a safe way to proceed. 2. The diffuser has what I assume are polarity markings. Each LED has the leads marked with 'A' and 'K' and the board has a '+' indicated for each diode. Can I assume that the 'K' is the '+', or do I not care? Thanks! Tony ke6g _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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Tony Parker wrote:
> > 1. The leads are too short. About a week ago Gerard, PA3GP, proposed > extending the leads by soldering short extensions. He got no > responses so I assume this is a safe way to proceed. I didn't have this problem with #6123. How long are the leads? > > 2. The diffuser has what I assume are polarity markings. Each LED has > the leads marked with 'A' and 'K' and the board has a '+' indicated > for each diode. Can I assume that the 'K' is the '+', or do I > not care? The diffuser has group 2 rotational symmetry, so it is not possible to put it in the wrong way round. -- David Woolley Emails are not formal business letters, whatever businesses may want. RFC1855 says there should be an address here, but, in a world of spam, that is no longer good advice, as archive address hiding may not work. _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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On Jan 20, 2008, at 12:44 PM, David Woolley wrote: > Tony Parker wrote: >> 1. The leads are too short. About a week ago Gerard, PA3GP, >> proposed >> extending the leads by soldering short extensions. He got no >> responses so I assume this is a safe way to proceed. > > I didn't have this problem with #6123. How long are the leads? > The leads are 1/8'. If I use the 1/8" spacers, there is not enough physical contact with the board to allow soldering. >> 2. The diffuser has what I assume are polarity markings. Each >> LED has >> the leads marked with 'A' and 'K' and the board has a '+' >> indicated >> for each diode. Can I assume that the 'K' is the '+', or >> do I not care? > > The diffuser has group 2 rotational symmetry, so it is not possible > to put it in the wrong way round. > The holes on the board are spaced 5/16" on both ends. When I insert the diffuser without the spacers, I can insert it either way and it looks like it aligns properly. I'm not seeing anything that I can use as a 'key'. Tony Ke6g _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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In reply to this post by Tony Parker-2
In a message dated 1/20/2008 10:07:21 A.M. Pacific Standard Time,
[hidden email] writes: The build of K2 #6358 has hit a road block! I have a couple of questions concerning the backlight/diffuser: 1. The leads are too short. About a week ago Gerard, PA3GP, proposed extending the leads by soldering short extensions. He got no responses so I assume this is a safe way to proceed. 2. The diffuser has what I assume are polarity markings. Each LED has the leads marked with 'A' and 'K' and the board has a '+' indicated for each diode. Can I assume that the 'K' is the '+', or do I not care? Thanks! Tony ke6g _______________________________________________ 1. I agree, but they did fit without modifying the process on #6281, but definitely shorter than #4887. 2. You do not care, as far as K2. 'K' has always meant Cathode (-) to avoid confusion with 'C' for Capacitance? or maybe because of the German language origins. In any even the device is symmetrical and cannot be installed incorrectly from the front side. My students, 10-12th grade had a little trouble figuring the plastic diffusion screen until they read the FAQs on it. We have the front panel done, the KAT2 KIO2 done and will start the RF Board as soon as the control board (1/2 done) is complete. 73, Al WA6VNN **************Start the year off right. Easy ways to stay in shape. http://body.aol.com/fitness/winter-exercise?NCID=aolcmp00300000002489 _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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In reply to this post by Tony Parker-2
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Ok. Thanks to Tom, David, Al and Ron.
I am going to try 'solder flow' method first. If that isn't satisfactory, I will try the to splice the lead as plan B. After getting the lead length thing out of my mind, and getting cathode and anode correct, I can see that there is no way to install it wrong. The density here is pretty striking sometimes.... Thanks again for your help. Tony ke6g On Jan 20, 2008, at 1:43 PM, Ron D'Eau Claire wrote: > I can't speak to the lead length problem, Tony, but your "fix" > sounds FB. > > As for the orientation, it doesn't matter! Yes, the polarity must > be right > for the diffuser to work, but the lead and pad arrangement is such > that > they'll be polarized correctly as long as the front side is facing > outward. > > Ron AC7AC > _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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The 'solder flow' worked. No need for plan B.
Now, I have one last question (ha ha). In reading the Application note on the LCD, it mentions a film that is on the back of some LCDs that can be seen as horizontal stripes when held up to light. I don't see any stripes, so far so good. The note also mentions that the back of the LCD is solid white. My LCD back is silver not white. Is this OK? Tony ke6g On Jan 20, 2008, at 1:56 PM, Tony Parker wrote: > Ok. Thanks to Tom, David, Al and Ron. > > I am going to try 'solder flow' method first. If that isn't > satisfactory, > I will try the to splice the lead as plan B. > > After getting the lead length thing out of my mind, and getting > cathode and > anode correct, I can see that there is no way to install it wrong. > > The density here is pretty striking sometimes.... > > Thanks again for your help. > > Tony > ke6g > > > > On Jan 20, 2008, at 1:43 PM, Ron D'Eau Claire wrote: > >> I can't speak to the lead length problem, Tony, but your "fix" >> sounds FB. >> >> As for the orientation, it doesn't matter! Yes, the polarity must >> be right >> for the diffuser to work, but the lead and pad arrangement is such >> that >> they'll be polarized correctly as long as the front side is facing >> outward. >> >> Ron AC7AC >> > > _______________________________________________ > Elecraft mailing list > Post to: [hidden email] > You must be a subscriber to post to the list. > Subscriber Info (Addr. Change, sub, unsub etc.): > http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/subscribers.htm > Elecraft web page: http://www.elecraft.com _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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