At what frequency?A good op amp has a PSRR of 100 dB!
Dirk,
are you deaf?
A source that has an output noise of 0.1mVac 20Hz to 20kHz is atrocious.
Apply that to a headphone or to a power amp or to any subsequent music replaying system and the signal to noise ratio is unacceptable.
You're assuming that all of the noise from the power supply comes out of the output from the amplifier and that is not the case as I tried to explain.
At what frequency?
Is that a rhetorical question or are you incapable of looking it up yourself? Maybe you should stop asking other people to do your work.
New Thread Started
I have started a new thread at
http://www.diyaudio.com/forums/forum-problems/206797-jc-80-ebay-pcbs-power-train.html#post2907934
The first post there is a warning to posters to abide by the rules. If you want examples of rudeness / trolling that will not be tolerated in part two, please read the last few posts.
I invite your continued readership in part two.
'gardz, Dick
I have started a new thread at
http://www.diyaudio.com/forums/forum-problems/206797-jc-80-ebay-pcbs-power-train.html#post2907934
The first post there is a warning to posters to abide by the rules. If you want examples of rudeness / trolling that will not be tolerated in part two, please read the last few posts.
I invite your continued readership in part two.
'gardz, Dick
Thanks for the info pinnocchio, Can you check also what the impedance of JC-2?
I'm also thinking to invite the JC-2 KIT from EBAY, what the jc2 sound character?
You can specify what you changed, and the most recommended swaps in your opinion?
Hi Foxye,
We're not on the right thread to discuss JC-2... I will PM you.
Do
Please do not post to this thread. Instead subscribe to part two:
http://www.diyaudio.com/forums/analog-line-level/206797-jc-80-ebay-pcbs-power-train.html
http://www.diyaudio.com/forums/analog-line-level/206797-jc-80-ebay-pcbs-power-train.html
in my bom missing this item
this is my bom from jims audio ( https://rapidshare.com/files/2758032630/JC80_BOM.xlsx)
please look at this
this is my bom from jims audio ( https://rapidshare.com/files/2758032630/JC80_BOM.xlsx)
please look at this
What do you think of this Borbely shunt regulator. Comes with two separate regulators for both channels. All FET Low Noise Super Shunt Regulator PCB Borbely | eBay
Erno's shunts
I found 313/2013 on ebay from Israel. I used them for my KSA 100 MKII. I hope they work. As for the 389/2013, I hoping to find subs 2SK170/2SJ74. If I do, if I understand this to be correct in some readings, that 389/109 are two in one jfets, so that I have to double the 2SK170/2SJ74s. Yes?. I use Erno's shunts, they are very good, but very expensive to build, many of the original semiconductors are discontinued (389/109, 313/2013), maybe there are substitutes you'll have to see.......
i have a question
trimmer r41 (1k) is for a adjustment dc offset;
Hi takis1969,
R41 trimmer is for Q1-Q2 and Q4-Q5 Bias. The DC offset is handled by a DC servo at the bottom of the PCB.
Ciao!
Do
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