[sdiy] Moog ladder theory questions

[Tim Ressel]

Yeah, that happens a lot around here  :-)  It's a sign of knowledgeable and enthusiastic people. At times it is irritating to ask what time it is and get told how to build a digital watch, but its also very informative. Religious arguments are rare and jihads are almost unheard of. Mostly this group is full of smart helpful folks who are great to know. 

Now to answer your question: The gain of a transistor is determined by the... Just kidding!

Did I mention the smart-a$$ members?

--TimR  


--- On Thu, 1/15/09, cheater cheater <cheater00 at gmail.com> wrote:

> From: cheater cheater <cheater00 at gmail.com>
> Subject: Re: [sdiy] Moog ladder theory questions
> To: synth-diy at dropmix.xs4all.nl
> Date: Thursday, January 15, 2009, 1:49 AM
> Guys!
> this has completely derailed :)
> I just want to know what transistors you use in your
> circuit boards,
> and what beta they have.
> :)
> 
> Cheers
> D.
> 
> On Thu, Jan 15, 2009 at 6:12 AM, Naoki Iwakami
> <naoki.iwakami at gmail.com> wrote:
> > Hi cheater cheater,
> >
> > It's quite detail but I believe beta difference
> between left to right
> > in the ladder create slight unbalance in the ladder
> output.  I think
> > that's why the minimoog service manual mentions
> about matching
> > transistor.
> >
> (http://www.fantasyjackpalance.com/fjp/sound/synth/synthdata/16-minimoog/002/905-matching-transistor.gif)
> >
> > But in my experience this issue is not so critical. 
> When  I used
> > 2SC1815, very generic transistor easily available in
> Japan, I tried
> > the Moog matching method but most of the transistors
> are within the
> > recommended range already.  Also I've not heard of
> any transistor
> > ladder VCF problems among my friends due to lack of
> transistor
> > matching.
> >
> > Thank you,
> > -- Gan
> > http://gaje.jp/
> >
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