[sdiy] 2164 stability values

[houshu at muj.biglobe.ne.jp]

Hello David and list,

You should not change the phase compensation network.

I made a rough simulation of the internal circuit of 2164.  It is not reliable
for design but useful to qualitative understanding.  It showed that the input 
resistor (30k) has almost no influence on the stability.  
I tested 10k to 100k and the difference is just the gain which is reverse 
proportional to the resistor value.

Stability (peak frequency and the height in the frequency response) 
varies with gain CV.  I guess the compensation network covers all the 
ranges as far as the input resistor value is over 10k.

Sam HOSHUYAMA
Saitama, Japan.


> 2018/06/28, 3:27, David G Dixon <dixon at mail.ubc.ca> wrote:
> 
> Hello List,
> 
> This is mostly a query for Neil Johnson:
> 
> If I change the 30k resistors around 2164 to 100k, what should the 500R-560p
> stability network be changed to?
> 
> According to my calculations (which are probably wrong), the 3dB point with
> the 30k resistor is around 4kHz. If I put in a 100k resistor, it goes down
> to around 1.2kHz. Obviously I'm doing this wrong.
> 
> Thanks in advance!
> Dave Dixon
> 
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