[sdiy] Moog ladder theory questions

[Naoki Iwakami]

Sorry I might misread your question.
My transistors are 2SC1815 and beta is around 200.
It's a general purpose AF transistor I usually use, I mean you don't
need  any "special" transistor for ladder VCF.

-- Gan

On Thu, Jan 15, 2009 at 6:49 PM, cheater cheater <cheater00 at gmail.com> wrote:
> 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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