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Old 27th August 2013, 07:49 PM   #9971
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Quote:
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Thank you... I see I got it all wrong
Ricardo, this is a simplified tighter 1.1 type reg especially made for the PCB phono. So it does not resemble the general use ones and it can perplex you on first look. Even some values are tweaked. The boards quality proved very best by the way. No corrosion with handling, very easy to solder, and very tough.
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Old 27th August 2013, 08:06 PM   #9972
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Quote:
Originally Posted by Salas View Post
You can use cranked up Bibs and leave the local regs unpopulated.
(Although it plays very coherently as it is, probably due to layout tightness with its regs).

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Seriously they seem awesome man... can' t wait to get my hands on a pair of these babies
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Old 27th August 2013, 11:15 PM   #9973
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Quote:
Originally Posted by Salas View Post
You don't hot rod it because when making an oven of a phono box your input stage will be drifting.
Found this out the hard way. Run cool on BIB and 2SK369 Sources. Too hot would drift and sounded totally different.
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Old 28th August 2013, 08:13 AM   #9974
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How about we sank everything except the power mosfets into resin to seal them from the heat and vibration?
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Old 28th August 2013, 06:44 PM   #9975
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Originally Posted by dimkasta View Post
How about we sank everything except the power mosfets into resin to seal them from the heat and vibration?
Why would anyone like to perplex the future paleontologists with what kind of organism was a K369 bug preserved in resin, escapes me.

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Old 28th August 2013, 08:13 PM   #9976
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You could try to match the resistors' positive tempco with caps of the same but opposite tempco, so that the time constants wouldn't change. I'm not sure how the JFETs' tempco influences the circuit.
How does the LEDs' voltage drop behave under temperature change?
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Old 28th August 2013, 08:50 PM   #9977
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As it is biased, the Norton Vref in the regs has a red LED compensation for its JFET CCS and measures very stable after 5 mins of warm up. The input stage runs circa 75% IDSS and its also nicely stable. Just don't push the ambient temp in the box with hot rod ideas is the precaution so to avoid tipping the tested thermal balance. Making it as the assembly notes will describe its enough to stay care free. I tested it for many hours in hot summer room temps near 30C with its lid closed and it did not do funny stuff.

http://www.ka-electronics.com/Images...LED_Tempco.pdf
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Old 30th August 2013, 07:54 PM   #9978
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Old 30th August 2013, 11:09 PM   #9979
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Looks like similar to VAR. They state 1ppm/C at +/-10ppm/C tolerance though.
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Old 31st August 2013, 01:52 AM   #9980
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Default Guide

Here is the PCB guide...
Takes some repeat reading for newcomers but this phono thread veterans will surely grasp it fast.
I have added MM compatibility values too. I kept it shortest possible, really.
If you spot mistakes let me know to correct and upload again.
I have sent to Tea what's needed for the PCB production also.
Group buy link.
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File Type: pdf Folded_Simplistic_PCB_Guide.pdf (722.8 KB, 895 views)
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