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Old 19th November 2013, 07:37 AM   #11
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why polymer electrolytic Is better than ordinary electrolytic
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Old 19th November 2013, 07:42 AM   #12
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Quote:
Originally Posted by GaryB View Post
As mentioned over in the "V3 build thread", for 75 ohm BNC jacks, I like the Amphenol 112432 jacks for mounting in DACs or digital sources. Any good 75 ohm coax cable and 75 ohm BNC will work fine for the cable. I use RG179 coax cable and whatever 75 ohm BNC connector looks good when it's time to build new cable. Crimp cables are better, but you need to buy a crimping tool which adds to the expense. Quite a few companies in the US sell premade 75 ohm BNC cables for very reasonable prices. One that I like is Markertek, which sells RG179 cables of various lengths with Trompeter 75 ohm BNCs already attached.

Regarding the power supply, I used one of the Subbu group buy 5v power supplies.

---Gary
Thank you for reply Gary

Amphenol 112432 Is to be enclosure mounted ?
Is there a limit for a coax length - can I use 9 m
do you hear / measure difference between ordinary cable with RCA and coax 75 ohm with BNC
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Old 19th November 2013, 02:20 PM   #13
GaryB is offline GaryB  United States
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Quote:
Originally Posted by samoloko View Post
Amphenol 112432 Is to be enclosure mounted ?
Yes

Quote:
Originally Posted by samoloko View Post
. . . can I use 9 m
Yes

Quote:
Originally Posted by samoloko View Post
do you hear / measure difference between ordinary cable with RCA and coax 75 ohm with BNC
Yes
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Old 19th November 2013, 02:22 PM   #14
GaryB is offline GaryB  United States
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Quote:
Originally Posted by samoloko View Post
why polymer electrolytic Is better than ordinary electrolytic
Panasonic has a very good overview of polymer caps on their website. Take a look here: http://industrial.panasonic.com/www-...AB8000PE24.pdf

I have quoted one passage which seems relevant:
"The OS-CON is an electrolytic capacitor that has excellent frequency characteristics. It improves ESR greatly, and provides the excellent frequency characteristics because the OS-CON uses a high conductive polymer as electrolyte. Fig.A: The OS-CON’s frequency characteristic shows a nearly ideal curve. When compared at 100kHz, The OS-CON 56μF, and low impedance aluminum electrolytic capacitor 1,000μF nearly have the same feature. Fig.B: The resonance point of the OS-CON is at 100kHz to 10MHz. The ESR is an extremely small value approximately 5mΩ at 100kHz of 560μF."

---Gary
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Old 21st November 2013, 08:19 AM   #15
atupi is offline atupi  Romania
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Found an blackgate PK 220uf 4V in my drawer and replaced C22. I must say it sounds very nice.
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Old 21st November 2013, 09:54 PM   #16
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Found an blackgate PK 220uf 4V in my drawer and replaced C22. I must say it sounds very nice.
Lucky guy, can't find those anymore.

I concur with GaryB that BNS 75 Ohm is the way to go but only if you use them at both sides. I use another variant which performs good and it is easy to mount as well. It is the Tyco/Greenpar 1-1478048-0 which is available through Farnell. I choose this one as it is also insulated and drilling just a hole is enough to mount them. It is also one of the more easily available here. I found that there are BNC 75 Ohm connectors that can only be mated several tens of times while this one is higher specced (500 times). It is rated "professional" FWIW. Bandwidth is 2 Ghz while the Amphenol is 4 GHz but I doubt if this will give benefits in this application.

When going BNC make sure you add a BNC 75 Ohm to the source as well. The worst combination is RCA to BNC cabling ! Better stay with RCA in that case.

And Gary ... you really should clean the flux from the PCB's
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Last edited by jean-paul; 21st November 2013 at 10:00 PM.
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Old 21st November 2013, 10:03 PM   #17
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Originally Posted by Eldam View Post
Hi,

thanks for that. Is the Wolfson chip strong enough to avoid imput cap as I see for example with some tips with CS80016 chip for spidf ?
Don't know what you exactly mean but you can put a jumper wire for the input cap if your source has a cap in the output. I suppose you mean the CS8416 chip ?
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Old 22nd November 2013, 12:10 PM   #18
Neville is offline Neville  United States
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JP what is the best way to remove flux especially when it sits between two close parts?
Thx
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Old 22nd November 2013, 12:23 PM   #19
atupi is offline atupi  Romania
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My choice is always isopropyl alcohol and a soft toothbrush.
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Old 22nd November 2013, 01:07 PM   #20
Eldam is offline Eldam  France
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My mouser arrives. I changed the big cap but the PS ones for OScon SEPC/SEPF and expensive top red organic from Panasonic when no exist at Sanyo.

When I look at the small smd caps and W8004, I really don't know if i will sucess, but doing myself is a part of the adventure...Flux FLUX...save me !
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