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Old 14th August 2005, 06:05 PM   #11
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Default Re: Re: Audio sector gainclone.

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Originally posted by Peter Daniel
Zobel also changes tonal balance, and some people prefer it this way.

Boy, I would like to see that statement verified with a spectrum analyzer.
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Old 14th August 2005, 06:07 PM   #12
jleaman is offline jleaman  Belgium
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Default Re: Re: Re: Audio sector gainclone.

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Originally posted by jackinnj



Boy, I would like to see that statement verified with a spectrum analyzer.

No fighting..
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Old 14th August 2005, 06:09 PM   #13
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Default Re: Re: Re: Re: Audio sector gainclone.

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No fighting..
No empiricism either.
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Old 14th August 2005, 06:12 PM   #14
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Default Re: Re: Re: Audio sector gainclone.

Quote:
Originally posted by jackinnj



Boy, I would like to see that statement verified with a spectrum analyzer.
Me too
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Old 14th August 2005, 11:37 PM   #15
dome406 is offline dome406  United Kingdom
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Sorry if this is a stupid question but is the Rf resistor the 22.1k resistor soldered between pin 3 and 8 of the lm3875 or is this another one, because I have soldered it below the the board if it is. The only reason I ask this is because I got 4 22.1k resistors and had none left by the time I got to the Rf one. and that would make sense.

And another quick question if you have time is what do the cz and rz capacitor and resistor do.

Sorry for all the questions I just want to understand all the options rather than just mess around with everthing and nothing work .

Thanks very much.
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Old 15th August 2005, 01:38 AM   #16
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If you soldered it below the board, then it's alright.

Cz and Rz are Zobel components and you can read about them here: I'm sorry, but the amp needs a zobel

As always, I leave the choice to use them, to you.

Zobel components are supplied with every Classic kit, they are supplied only if asked for, with a Premium version.
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Old 15th August 2005, 08:02 AM   #17
dome406 is offline dome406  United Kingdom
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Here is a picture of the underside, what should I use to clean all the flux and stuff off it because you cant get rubbing alcohol in this country. Is meths ok or is it too oily.

http://img227.imageshack.us/img227/9276/dscf07960lj.jpg

Thanks
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Old 15th August 2005, 08:06 AM   #18
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Can't you get some burning alcohol or propanol?

You can also take a stuff brush short hair but soft, brush dry first then brush wet with plain water and dish detergent like "Yes". Rinse with water and blow it dry with compressed air or let it dry in 40-50 deg for an hour or so.

I use first propanol and then Yes and water. I dry with compressed air.
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Old 15th August 2005, 08:51 AM   #19
dome406 is offline dome406  United Kingdom
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Ok I will give it a go.

Thanks
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Old 15th August 2005, 01:19 PM   #20
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Here's the preferred way to mount feedback resistor. Although it is intended for Caddock mostly, it should also work with regular resistors. There is a small hole right beside pin 8 for one resistor's end, the other end solders directly to pin 3 on the chip. This method eliminates the chip pins length (when mounted underneath) and allows shortes feedback loop, at the same time being easy to implement, without need for elaborate resistor pins bending.
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