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Old 11th November 2009, 03:23 AM   #11
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Join Date: Nov 2004
Location: Rome
Nico, great answer, I'll copy and paste in my electronic archives for future use!!
Paul, thanks for the information. I already saw the Elliot's page, but I didn't put it in relationship with your tone control. I think that the Crown IC150 preamp should be similar to the Nikko trm-750 stage, and I'll try to give it a look (if I'll find it...).
The schematics that I posted is referred to the line stage - tone control, it works but it has too much gain (I think 10+1, somewhat around 21-22 dB). The question was if I can be able to reduce the overall gain by about 10 dB, even if I loose the boost-cut linearity (really I tend to don't use tone control, and when I use it I apply a VERY small amount of "correction").
The schematics used in your headphone amp has too low gain for my needs, the optimum should be the Nico's last answer approach applied to non-inverting topology, (very educational and appreciated) with a focus to the overall gain.
I like the active component's minimalist approach of the non-inverting topology and I'd like to play with it.

Thanks again Nico and Paul for your precious information.


p.s.: I've just found the Crown schematics, very similar to the Nikko's one, but it seems a better sounding one due to the frequency choice (they look similar to Elliot's choice). If I'll not be able to reduce the gain in my Nikko, surely I'll play with the Crown's value to improve the control.
Here is the pages for the schematics link:

Last edited by diymax62; 11th November 2009 at 03:39 AM. Reason: additional information...
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Old 12th November 2009, 07:35 PM   #12
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Join Date: Nov 2005
Location: East Coast of South Africa
I am pleased that we could assist in some way, it is always a pleasure

Kindest regards

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