Preamp schematics, designs..any guide to PASS, FW, Threshold etc listed in one place? - diyAudio
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Old 24th July 2013, 05:36 AM   #1
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Default Preamp schematics, designs..any guide to PASS, FW, Threshold etc listed in one place?

Hi guys,

Heading out camping again and looking for things to print to read at camp at night. I want to build one a Nelson designed preamp, both line stage and phono, maybe in one box, maybe separate. I know about using the front ends of some of the power amps for line stage, but can't seem to find any STICKYS on dedicated preamps, phono or other. I don't have hours to spend going thru countless search variations. I checked the list "Concise guide to published CCts" and it only listed BOZ, BOZOZ and B1B.

Could someone please point me to a list of preamps we could consider for building? Thanks!!

Cheers

Paul

PS sincere apologies is this has been covered somewhere, but I just can't find it.
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Old 24th July 2013, 06:13 AM   #2
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For phono preamp you can try this:
https://www.passdiy.com/project/preamplifiers/pearl-2
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Old 24th July 2013, 09:36 AM   #3
lykkedk is offline lykkedk  Denmark
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Kilohertz, are you looking for old fashion mosfet preamps?

Or are you going for some newer jfet frontend ones ?

/ Jesper
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Old 24th July 2013, 03:15 PM   #4
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Quote:
Originally Posted by lykkedk View Post
Kilohertz, are you looking for old fashion mosfet preamps?

Or are you going for some newer jfet front end ones ?

/ Jesper
Well, crap. I knew I would miss something obvious. I forgot about the PASSDIY site. I was just looking here. Thanks for the Pearl link.

Jesper, either or, no preference (yet) as all I have are tube preamps currently.

Cheers!

Paul
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Old 24th July 2013, 04:06 PM   #5
lykkedk is offline lykkedk  Denmark
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Well...

I build some bosoz yeaaars ago

Easy to make, and no humming problems.
I even did one, which i still got on the roof, with a gain of > 20, for my voltagehungry F4's.

For some years back, i build a a20 (see link), i use it as writing, and i am very satisfied with it. The thing is running class A of cause.

But its not pass through

https://plus.google.com/photos/10441...233?banner=pwa

The α20 Line Stage Amplifier
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Old 25th July 2013, 09:29 PM   #6
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Originally Posted by georgesco View Post
that is such a shame, passdiy used to have PDF file's why on earth did that change?
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Old 25th July 2013, 10:10 PM   #7
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Originally Posted by boatbuilder View Post
that is such a shame, passdiy used to have PDF file's why on earth did that change?
Agreed. I printed a bunch of documents from the site to read while camping and I get here and now can't even see the schematics or some values. (mind you my eyes aren't what they used to be). PDF were much better.

Cheers

Paul
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Old 25th July 2013, 10:16 PM   #8
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the pdf's did'nt have mistakes in hem either. i have been looking around and seen silly mistakes. talking about a psu, showing the traces of the pcb and the next pic being the silkscreen from the preamp pcb. missing values in the bom and more like that. the site is just a bit messy at the moment.
i hope thy will find time to change that soon.
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Old 26th July 2013, 08:02 AM   #9
nr12 is offline nr12  Germany
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Originally Posted by kilohertz View Post
Agreed. I printed a bunch of documents from the site to read while camping and I get here and now can't even see the schematics or some values. (mind you my eyes aren't what they used to be). PDF were much better.

Cheers

Paul
Hello Paul,

try the wayback machine:
Technical Articles
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Old 26th July 2013, 12:49 PM   #10
flg is offline flg  United States
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I believe I have the PDFs of almost everything NP has had on the site for 10 years back or more. What would you like? Shoot me a PM with your actuall address and I will send them to you.
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