Chasis + GC complete. First listening tests...

[Nuuk]

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]

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]

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]

But I guess you would rather go with inverted anyway!

Yes.

 

[Cappy]

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]

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]

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]

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?