Re: mic preamp modification

"Joerg" <notthisjoergsch@xxxxxxxxxxxxxxxxxxxxx> wrote in message
news:yMy5e.877$RQ7.31@xxxxxxxxxxxxxxxxxxxxxxxxxxxxx
Hi, Joerg.

> Hello Graham,
>
>>>FWIW, the 4052 is a dual 4:1 multiplexer. Sometimes also used to switch
>>>resistors in and out for gain control.
>>
>> Erk ! Thinks *non linear resistance with applied voltage*.
>
> Yes. The true audio freak would frown and at least use an SD5400 here.

In one project I worked on, one of the most competent and
conscientious engineers I've known used the 8:1 mux from
that family for a wide, RF (2 to 13 MHz), barrel switch
where noise and distortion were both critical parameters.
(The signal at that point was boosted enough that thermal
noise from the switch was not too harmful, and judicious
use of carefully biased followers eliminate most distortion.)

>>>Phantom power sources can be a noise contributor but if so that could be
>>>filtered.
>>
>> Damn well shouldn't be a noise source unless the designer was mentally
>> defective !
>
> Then I guess I have diagnosed mental defects in two designers life-to-date...

I expect you were more charitable than to do that.

> Both systems looked very expensive and "pro", BTW. Needed ferrites and better electrolytics.

Often, I think, appearance is the primary design
goal in expensive audio gear sold to consumers.

Best regards,
--
--Larry Brasfield
email: donotspam_larry_brasfield@xxxxxxxxxxx
Above views may belong only to me.


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