Chasis + GC complete. First listening tests... - Page 5

Nuuk · 7th September 2004, 05:24 PM

Quote:

Don't forget, the pot is in parallel with the 22k resistor (from +IN to Ground).

I was assuming that it was isolated by the input cap.

carlosfm · 7th September 2004, 07:03 PM

Quote:

Originally posted by Nuuk
I was assuming that it was isolated by the input cap.

If you use the input cap, yes.
Not everybody uses it.
The input cap will only protect from DC from the source.
With NI, I would rather use the Ci cap. and have 2~5mv DC-offset.

Nuuk · 7th September 2004, 08:23 PM

Quote:

With NI, I would rather use the Ci cap. and have 2~5mv DC-offset.

But I guess you would rather go with inverted anyway!

carlosfm · 7th September 2004, 10:52 PM

Quote:

Originally posted by Nuuk
But I guess you would rather go with inverted anyway!

Yes.

Cappy · 8th September 2004, 07:06 AM

Regarding the Ci cap that Carlos mentions, has anyone tried it on their Gainclone?

I might be interested in trying this with Brian's PCB. Carlos, should I stick with the 22 uF cap in that case?

Thanks.

carlosfm · 8th September 2004, 09:35 AM

22uf is fine if you use 1k for Ri.
If 680 ohms, go for 33uf.
Bypass with 0.1~0.22uf poly.

Yes, I tried with and without that cap.
With the cap I have 4mv on one channel, 5mv on the other one.

Without the cap, I don't remember, it was long ago...
But it was much higher than this.
I used 33uf + 0.15uf poly.

Vikash · 8th September 2004, 09:56 AM

I've just read on the gc glossary that to bypass is to offer a low impedance route for high frequency noise. I just want to make sure this means connecting the 0.1uf in parallel with the 33uf?

I'll give the Ci cap a go too

carlosfm · 8th September 2004, 10:41 AM

Quote:

Originally posted by Vikash
I've just read on the gc glossary that to bypass is to offer a low impedance route for high frequency noise.

Why use low ESR caps, then?

8th September 2004, 09:56 AM	#47
Vikash diyAudio Moderator Emeritus Join Date: May 2003 Location: UK	I've just read on the gc glossary that to bypass is to offer a low impedance route for high frequency noise. I just want to make sure this means connecting the 0.1uf in parallel with the 33uf? I'll give the Ci cap a go too __________________ "The human mind is so constituted that it colours with its own previous conceptions any new notion that presents itself for acceptance." - J. Wilhelm. (But I still think mine sounds better than yours.)

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8th September 2004, 07:06 AM	#45
Cappy diyAudio Member Join Date: Feb 2004 Location: Southern Willamette Valley	Regarding the Ci cap that Carlos mentions, has anyone tried it on their Gainclone? I might be interested in trying this with Brian's PCB. Carlos, should I stick with the 22 uF cap in that case? Thanks.

8th September 2004, 09:35 AM	#46
carlosfm Banned Join Date: Mar 2003 Location: Lisbon, Portugal	22uf is fine if you use 1k for Ri. If 680 ohms, go for 33uf. Bypass with 0.1~0.22uf poly. Yes, I tried with and without that cap. With the cap I have 4mv on one channel, 5mv on the other one. Without the cap, I don't remember, it was long ago... But it was much higher than this. I used 33uf + 0.15uf poly.

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