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-   -   Are you using the resistor? (http://www.diyaudio.com/forums/chip-amps/15119-you-using-resistor.html)

Ricren 14th May 2003 02:37 AM

Are you using the resistor?
 
Hi folks,
After all that's been written about GCin different incarnations, I have one question:

Are you using the resistor at the output, or some kind of zobel network or perhaps nothing?

I've built some prototipes that seem to work fine with short speaker cables, but now that I'll build a couple of clones to use as surround amps I'm not shure about stability with long speaker cables, let's say 7 or 8 meters.
What you say?

cheers

Ric

gene 14th May 2003 03:17 AM

from my listening experience:
adding 0.22 Ohm resistor improve speed and dynamic,
without it, the sound became soft, maybe muddy.
:rolleyes:

carlosfm 16th May 2003 01:26 PM

Re: Are you using the resistor?
 
Quote:

Originally posted by Ricren
Hi folks,
After all that's been written about GCin different incarnations, I have one question:

Are you using the resistor at the output, or some kind of zobel network or perhaps nothing?

I've built some prototipes that seem to work fine with short speaker cables, but now that I'll build a couple of clones to use as surround amps I'm not shure about stability with long speaker cables, let's say 7 or 8 meters.
What you say?

cheers

Ric

I use the resistor.
It improves stability of the chip for a wider range of cables.
I don't think you need a zobel network.
The series resistor should be as close to the output pin as possive, like in any op-amp.
Yes, this is a power op-amp.

Ricren 16th May 2003 04:02 PM

Values?
 
What would be the prefered ohms/watts values for the resistor?


cheers

Ric

carlosfm 16th May 2003 04:18 PM

I use 0.22 ohms, 4 watts.
4 or 5 watts is more than enough.

elizard 16th May 2003 05:31 PM

forgive me, but how would you go about connecting the resistor?
would it be between the +/- of the speaker outs?

Peter Daniel 16th May 2003 06:52 PM

It would be between output pin of a chip and a binding post in the amp.

Ricren 16th May 2003 07:32 PM

I remember....
 
Several years ago I read an article in a well regarded magazine about using very low value resistors in the speaker path of certain SS amplifiers to get better sound. They were talking about values up to 1 ohm.

Ric

Monolith 16th May 2003 08:13 PM

Recommended Resistor Type for Output?
 
Any preference for type (thick film, wirewound, etc.) of resistor in this application? Mills? Caddock? other choice?


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