[sdiy] Which transistors for synth circuits?

Michael E Caloroso mec.forumreader at gmail.com
Sat Jan 1 16:02:26 CET 2022


In a polyphonic synth using a homogenous patch, if the cutoff does not
match or track across voicecards then it has a direct impact on the audio
path.

CV sources can indeed affect the audio path.

MC

On Sat, Jan 1, 2022 at 9:49 AM Peter Pearson via Synth-diy <
synth-diy at synth-diy.org> wrote:

> C'mon, EVERYONE knows modern synths sound bad because SMD sounds worse
> than through hole.
>
> Anyway I would think that if part choice was going to matter, it would be
> in the audio path and not the CV path, no?  This 2N3905 vs 2N3906
> controlling the 3080s in an OBX thing seems to be more about how the
> circuit tracks CV than how it would sound at the same cutoff/resonance.
>
> On Sat, Jan 1, 2022 at 8:28 AM cheater cheater via Synth-diy <
> synth-diy at synth-diy.org> wrote:
>
>> On Sat, Jan 1, 2022 at 1:09 AM Adam Inglis (synthDIY)
>> <synthdiy at adambaby.com> wrote:
>> >
>> >
>> >
>> > > On 1 Jan 2022, at 09:17, cheater cheater via Synth-diy <
>> synth-diy at synth-diy.org> wrote:
>> > >
>> > > Poor or not, that's what his OBX was using.
>> > >
>> > > As for my question, I'm more interested in the non-linearities of the
>> > > transistors in question, and whether there's some uniqueness to that.
>>
>> I just don't believe that topology can always let you fully escape the
>> physical properties of a part.
>>
>> On the other hand I'm sure there are situations where it can, and I
>> wonder if that's the reason why all modern synths sound exactly the
>> same type of bland.
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