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  #16  
Old 28-08-12, 08:25 AM
Sparts155 Sparts155 is offline
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I don't know if anyone has actually tested what decoupling is necessary for the amp to work properly, but I'd want a small film cap after the "Vbe" to keep impedance reasonably low at high frequencies. Having extra electrolytic caps here isn't necessary, but may change the sound of the amp to taste.
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  #17  
Old 28-08-12, 08:26 AM
GWM GWM is offline
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Quote:
Originally Posted by 337alant View Post
Did anyone try removing the following caps,
C6, C7, C9, C10, C11, C12?, Just for discussion are they still necessary?, I dont see what they are doing and the FE 0V at the front left and right of the boards dont go to anything so thats a couple of ground leads we could do away with ?

Keep C5 and C8 and just stick a 100N wima accross it on the back of the board or keep C10 & C12?

Alan
Yea replaced C6 through 12 with a pair of 5.6uF MUNDORF polyprops I had spare cleaner smoother sound.
Someone else mentioned replacing the last cap on the outlet of the main CAP board with a 10,000uF as well think it was a Mundorf does it ever end.
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  #18  
Old 30-08-12, 10:37 AM
mr_phil mr_phil is offline
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Anybody got a link / part number to the 68uf Wima films? There are so many of the b****y things I want to get the right ones!
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  #19  
Old 30-08-12, 10:49 AM
hacker hacker is offline
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I can't find them anywhere. I think I got mine off ebay sometime in 2009 and haven't really seem 'em since. AVX 68uF also work well - they're available at Mouser for a ridiculous price: http://www.mouser.com/ProductDetail/...INM0ku01Zsk%3d
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  #20  
Old 07-09-12, 02:30 AM
DJM DJM is offline
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This is useful site for finding stuff...

http://www.eciaauthorized.com/search/B32522C106K

..if you have the part number
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  #21  
Old 08-09-12, 11:08 AM
Strictly Stereo Strictly Stereo is offline
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Nice work
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  #22  
Old 07-01-13, 05:10 AM
keithsnaim keithsnaim is offline
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Tony !. With so many Hacker builds about to begin, can this thread go in the Reference section please.

Regards Keith
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  #23  
Old 07-01-13, 05:17 AM
Bemused Bemused is offline
What's this all about then?
 
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You best pm TonyL Keith
Tony pretty much leaves us alone and seldom calls in
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  #24  
Old 07-01-13, 06:14 AM
keithsnaim keithsnaim is offline
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Thanks for the pointer Tony.
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  #25  
Old 07-01-13, 06:18 AM
keithsnaim keithsnaim is offline
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I have asked TonyL if it can be made sticky or put in the reference section.

Best Keith
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  #26  
Old 07-01-13, 06:57 AM
Tony L Tony L is offline
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Thanks Keith, looks like a prime candidate for a reference room thread what with all the excellent pics 'n' stuff. The only downside is it now becomes read-only. I can easily make one / more of you a FAQ owner if it needs any maintaining, just drop me a PM.
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  #27  
Old 30-01-13, 12:51 PM
hacker hacker is offline
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Hi all,

I've posted updated an BOM (v1.7).

Changes
C2: Changed 47uF feedback cap to 68uF.
C10, C12: Now omit these parts completely.
C5, C6, C7, C8, C9, C11: Changed from 100uF electrolytic to 2u2 film

I've also added 2 new workbooks to the spreadsheet, one for front-end PSU and one for the output stage PSU. You'll find links to Qspeed diodes, kendeil caps, etc.

Links
Build manual PDF: http://hackernap.com/docs/Build%20Manual%20v1.2.pdf
BOM v1.7 PDF: http://hackernap.com/docs/HackerNAP%20BOM.pdf
BOM v1.7 Excel: http://hackernap.com/docs/HackerNAP%20BOM.xls
All HackerNAP/HackerCAP related files: https://www.box.com/s/jnasoijb2gg7mopasbuo

Cheers,
Carl
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  #28  
Old 01-03-13, 11:10 PM
hacker hacker is offline
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Thanks Martin.

Folks, I've updated the build manual and connection diagram. Nothing major, just reflected a preference for 42-0-42 front-end and added some more pictures.

https://www.box.com/s/jnasoijb2gg7mopasbuo
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  #29  
Old 02-02-14, 02:44 AM
Jo Sharp Jo Sharp is offline
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Further updated advice from Hacker (in this thread http://www.pinkfishmedia.net/forum/s...php?t=151178):



So yes, the single best thing you can do at present is ditch the film feedback cap (heresy!!) for a wet tant.

Feedback cap (C2)
Tantalum, axial, wet, at least 68uF. Voltage not important, there's only a couple of mV across it. Do this if you do anything, it's the best upgrade I've made to my amps. In fact I'd go as far as saying: do not put film feedback caps into a HackerNAP. Period!

C13 and C14 - Output transistor decoupling caps
If you can find them and make them fit (definitely not a drop-in mod!), remove the 470uF output decoupling caps (C13/C14) and replace them with 22uF - 68uF polyester film caps rated for 63V+. The difference this makes to bass clarity is very worthwhile. I used obsolete/unobtanium 47uF/63V Evox Rifa MMK for this.

John Luckins' VBE mod
I'm too lazy to link to it, but this is a great mod that vastly improves (reduces) the output impedance of the front-end VBE filter, which in turn improves bass response.

HackerCAP - Output stage
Ditch the inductors and use chunky wire links instead. This keeps the output imepedance as low as possible. Only do this to the output stage HackerCAPs, not the front-end ones; those should remain heavily filtered with CRCRC.

C25 - CCS filtering cap
There's approximately 25V across this cap, which opens up the possibilities for higher capacitance. I moved to a 10uF/50V Wima MKS2, which just drops in.

Getting silly - wanky caps
The front-end power rails benefit from the very best decoupling caps you can find/afford. Currently I use brass cased 1uF polystyrene NOS Russian caps at C19 and C11. These are rarer than rocking horse shit but a bargain if you can find them on eBay, etc.

Also worth doing is the input cap. I use the obsolete/unavailble Evox Rifa SMR polyphenylsulphide caps. You could usefully use a polypropylene type here, although good luck getting it to fit on the PCB.

This list is based on order of preference, first to last. Every suggestion except the wanky caps is something I would consider a "must do" mod. The fancy caps are really just like the salt and pepper - flavour according to taste. The rest of the changes make a fundamental difference that shouldn't be missed.

There are more changes in the works. For example, John Luckins has been working on a hot-rodded SuperReg arrangement for the front-end supplies. I fully expect this to be another "must do" mod.

http://www.pinkfishmedia.net/forum/s...7&postcount=20

Last edited by Jo Sharp; 14-02-14 at 02:06 AM. Reason: link added
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  #30  
Old 02-02-14, 07:11 PM
hacker hacker is offline
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Latest BOM (v1.8): http://hackernap.com/docs/HackerNAP%20BOM%20v1.8.xls

Latest build manual (v1.4): http://hackernap.com/docs/Build%20Manual%20v1.4.pdf

The BOM incorporates latest cap changes. The manual fixes the wiring diagram that was cut off - you now get the whole thing.
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