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Old 5th March 2010, 02:10 PM   #1011
Salas is offline Salas  Greece
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Quote:
Originally Posted by cedricb View Post
thanks a lot @Salas, I'll buy this one! ;-)
Buy some normal RG179 too, its very cheap, so you can compare, because sometimes silver plating can ''shine'' the wrong way.
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Old 5th March 2010, 02:13 PM   #1012
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Quote:
Originally Posted by cedricb View Post
just off-topic, for the IC: PCB to RCAs, volume control, etc.

Can I use this coax cable? NEXANS|RG179BU 100M|CABLE, COAX, RG179BU, PER M | Farnell United Kingdom ...it has low capacitance and it's copper with silver coated
This cable has been recommended by this site
I don't have too much experience for this, but I asked the same for a similar cable on the forum and they told me not to use it because it has STEEL in the conductor core. It gives you bad sound (at least, is what people say about steel)

If you look at the datasheet, it sais:
CONDUCTOR: S.P.C.C.S. (Silver Plated Copper Clad Steel).
What makes me think that the inner of the core conductor is made of, well, steel.

Are my suppositions right? If not, I have some similar cables wich could be able to use.

Thanks
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Old 5th March 2010, 02:18 PM   #1013
Tea-Bag is offline Tea-Bag  United States
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Quote:
Originally Posted by pengboon View Post
Heat sinked into the chassis should suffice for 200mA (~8R) right?
My DCB1 with 15R resistors (what I found in basement) does not run hot attached to sheet metal of chassis.
Although not environmentally friendly, it sounds best when left on all the time.

Otherwise it doesn't really start grooving for 4-6 hrs.
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Old 5th March 2010, 02:19 PM   #1014
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Originally Posted by Salas View Post
Of course you can when there is another volume pot in the chain.
But do not forget to parallel with the input resistor (220k) another resistor ranging from 22k to 27k. This is to make the source see the end with the same input impedance as if it were with the pot soldered.
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Old 5th March 2010, 02:29 PM   #1015
Salas is offline Salas  Greece
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Yes it will play better that way for the short while without its own pot. But he must remember to take it out after.
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Old 5th March 2010, 02:33 PM   #1016
Salas is offline Salas  Greece
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Quote:
Originally Posted by regiregi22 View Post
I don't have too much experience for this, but I asked the same for a similar cable on the forum and they told me not to use it because it has STEEL in the conductor core. It gives you bad sound (at least, is what people say about steel)

If you look at the datasheet, it sais:
CONDUCTOR: S.P.C.C.S. (Silver Plated Copper Clad Steel).
What makes me think that the inner of the core conductor is made of, well, steel.

Are my suppositions right? If not, I have some similar cables wich could be able to use.

Thanks
He can always try a meter since that other guy in the link liked it and then compare normal RG179 or other and decide. I recommend Steely Dan's music for the comparisons then. But he must do it again sometimes because cables is a controversial issue.
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Old 5th March 2010, 02:56 PM   #1017
cedricb is offline cedricb  Europe
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Originally Posted by Salas View Post
He can always try a meter since that other guy in the link liked it and then compare normal RG179 or other and decide. I recommend Steely Dan's music for the comparisons then. But he must do it again sometimes because cables is a controversial issue.
@Salas, do you have link for a pure copper RG179? I can only find S.P.C.C.S online...
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Old 5th March 2010, 03:28 PM   #1018
Salas is offline Salas  Greece
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I found one (looks bad copper btw), but I have never seen it in stores. Mine is copper clad and just tinned, PVC insulation. Its a smoothie sti(ee)ll. You gotta compare them as I say. They cost very normally.
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Old 5th March 2010, 03:35 PM   #1019
massimo is offline massimo  Italy
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The mil-spec RG179 (75 ohms) silver coated with Teflon insulator is very good for digital cable too.
The RG178 should be better for analog being 50 ohms.....
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Old 5th March 2010, 04:13 PM   #1020
sugden is offline sugden  Singapore
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How much is your voltage after rectification? Maybe its a bit low? In general use as much current as it can allow the Mosfets not to feel too hot to touch.
After adding the third parallel 68R to my DCB1:
1. Transformer sec. output= 11.76V
2. After rectification= +14.85V and -14.91V
3. Voltage drop across 3 parallel 68R = 1.552V and 1.670V.
Any comment on all voltage above? I touch the MOSFETs after on for 15min don"t feel hot just a bit warm, i think it ok.

Edit:will add sink to MOSFETs soon i get the chassis.
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