[sdiy] Tau Systems

[rtarcan]

On 31.03.2011 00:54, Juergen Haible wrote:
> AFAIK pnps of the same size are less noisy than npns.
> Maybe due to the different mobility of electrones vs holes?
Yes. Holes has less mobility....
Rizacan
> It's been a long time since I've learned (and then forgotten) that ...
>
> JH.
>
>
> ----- Original Message ----- From: "Stewart Pye" 
> <stewpye at optusnet.com.au>
> To: <synth-diy at dropmix.xs4all.nl>
> Sent: Wednesday, March 30, 2011 11:02 PM
> Subject: Re: [sdiy] Tau Systems
>
>
>> Usually the transistors in discrete microphone preamp designs are PNP 
>> too. I've always assumed this was because it was easier / cheaper to 
>> get low noise PNP transistors. Even modern discrete designs use PNP 
>> transistors. I left my copy of "Small Signal Audio Design" at work. 
>> It may shed some light on this...
>>
>> Regards,
>> Stewart.
>>
>> lanterma at ece.gatech.edu wrote:
>>> On Mar 30, 2011, at 1:51 PM, <jays at aracnet.com>
>>> <jays at aracnet.com> wrote:
>>>
>>>
>>>> In the day of Japanese radios most of the transistors used were
>>>> germanium and not silicon. PNP germanium transistors were easier to
>>>> build and I think may of been less noisy than NPN ones.
>>>>
>>>
>>> PNPs also seem to be used all over old guitar pedals (like the 
>>> original Fuzz Face), probably for the same reasons.
>>>
>>> - Aron
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