[sdiy] Which transistors for synth circuits?

[cheater cheater]

Thanks all, do any of you also every mess around with germanium or
GaAs based transistors? Is there a reason to get a bunch to play
around with? Not for production, just for own fun.


On Fri, Dec 31, 2021 at 12:11 AM Oren Leavitt via Synth-diy
<synth-diy at synth-diy.org> wrote:
>
> Some transistors in my general stock and what scenario I use them in:
>
> 2N3904/BC847 (NPN), 2N3906/BC857 (PNP), and 2N3819 (N ch JFET), 1N4148
> (Si diode) - most general purpose "jelly bean" stuff.
>
> BCM847 (dual NPN) and BCM857 (dual PNP) - small SMD matched pairs for
> discrete OTA/ladder filters, current mirrors, expo converters, etc.
>
> SSM2212 (dual NPN) - precision, low rbe expo converter for VCOs.
>
> MPSA42 (NPN) and MPSA92 (PNP) - high voltage 300V.
>
> 2N5088/5089 (NPN) and 2N5087 (PNP) - high hFE.
>
> 2N4402/4403 (PNP) and 2N4857/4391/4393 (N ch JFET) - Discharge switches,
> choppers.
>
> Other small signal and power transistors for occasional hi-fi/power
> amplifier projects.
>
> - Oren
>
> On 12/30/21 12:18 PM, cheater cheater via Synth-diy wrote:
> > Hi all,
> > I was wondering how you pick out transistors (as well as diodes) for
> > synth circuits like filters. For example moog filter, 303 filter, etc.
> > Do you look for anything in specific? I'm talking about a situation
> > where you don't want to use the exact part in the schematic, but want
> > to play around with parts and see what comes out of it.
> >
> > Best regards
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