[sdiy] Which transistors for synth circuits?

Mike Bryant mbryant at futurehorizons.com
Thu Dec 30 22:33:26 CET 2021

I mostly use MMBT5401 (PNP), MMBT5551 (NPN) and BAV99 (dual diode, even for singles).   Keeps volumes up and stocks down.

2SA1312 is my low noise transistor but going obsolete.

TBH, if changing transistors randomly changes the sound then the design needs some improving.  Far better to design in a particular 'sound' so it's repeatable.

-----Original Message-----
From: Synth-diy [mailto:synth-diy-bounces at synth-diy.org] On Behalf Of cheater cheater via Synth-diy
Sent: 30 December 2021 18:19
To: synth-diy
Subject: [sdiy] Which transistors for synth circuits?

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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