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Old 1st December 2012, 11:18 PM   #3141
Zen Mod is offline Zen Mod  Serbia
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Old 1st December 2012, 11:40 PM   #3142
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Old 2nd December 2012, 12:19 AM   #3143
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Looking for .025 ohm 1% resistors to continue experiment - Should they be non inductive?

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Bob
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Old 2nd December 2012, 02:19 AM   #3144
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I don't think you really need the mounting flanges on the daughter boards. That will also add to the cost due to more than 5 points of routing.
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Old 2nd December 2012, 12:05 PM   #3145
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Looks great !!!
And a piece of art.
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Old 2nd December 2012, 12:49 PM   #3146
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Old 2nd December 2012, 12:52 PM   #3147
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Originally Posted by flocchini View Post
Looking for .025 ohm 1% resistors to continue experiment - Should they be non inductive?

Thanks

Bob
Bob,
I see this
LVR03R0250FS70 Vishay/Dale | Mouser


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Originally Posted by luvdunhill View Post
I don't think you really need the mounting flanges on the daughter boards. That will also add to the cost due to more than 5 points of routing.
I chatted with the board house on this. They dismissed any difficulty or high cost associated with it, and to essentially treat as a square board measured from the edges. It was CRTs idea to bolt on (and he has done the most work, me I just complain a lot about small things) and I think a good one. Probably a Jensen will not fall off, but I suspect an Edcore Xs-4400 like Generg uses might. Good precaution. I will start seperate thread soon once i am close to sending gerbers out for production.

Last edited by Tea-Bag; 2nd December 2012 at 12:54 PM.
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Old 2nd December 2012, 02:24 PM   #3148
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They are nice but, an LVR05R025 will radiate heat better, stay cooler and has 1/2 the Tc of the 3W in that R range.
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Old 2nd December 2012, 02:34 PM   #3149
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Originally Posted by Tea-Bag View Post
So, with Nelson's approval, I will try to post something close to the following for sale after a prototype is made and built.

It will use a daughter card concept to add in a Onetics or Jensen transformer, or allow a Perfboard to be mounted on the 2x10 2.54 Male pins to roll your own transformer onto it.

It will have all four pots and will be based on the F6 Second Harmonic. If one wants a simpler versions than jumpers need to be put in place for it. It may not be for everyone, but it will reach market, pending approval and I don't get hit with a snowplow or something.
Pandora's box for transformer tweaking...... beautiful!
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Old 2nd December 2012, 02:36 PM   #3150
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Heat dissipation is not an issue for such a low resistance. The idle power will be Ibias^2*R. For Ibias=1.5A, and R<0R44, the power will be less than 1 watt.

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They are nice but, an LVR05R025 will radiate heat better, stay cooler and has 1/2 the Tc of the 3W in that R range.
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