[sdiy] improved dynamic range diffpair-vca

[HOSHUYAMA]

Hello Nils,

Thank you very much for reporting the experimental results.
I'm very happy to see that my schematics have inspired someone.

Sam Hoshuyama
Saitama, JAPAN

From: np <np at planetarc.de>
Subject: Re: [sdiy] improved dynamic range diffpair-vca
Date: 2007/04/25 17:23:19
> Thanks everyone for answering. Now I got the idea why it works.
> 
> I've done a plot of the base voltage vs. the output of my differential 
> amplifier. The circuit wasn't trimmed, and my differential amplifier is 
> inverting so the curve is mirrored. You can estimate the amount of 
> distortion based on the base voltage drive though:
> 
> http://torus.untergrund.net/vca_improved_trace.gif
> 
> Regarding noise: My primary source of noise is hum and rf stray-ins. I 
> doubt that the extra np-connection will contribute that much, but beeing 
> able to drive the base harder was a win SNR-wise. At least for me.
> 
> Nils
> 
> 
> 
> 
> 
> 
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