[sdiy] Which transistors for synth circuits?

Oren Leavitt obl64 at ix.netcom.com
Fri Dec 31 00:08:03 CET 2021

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, 

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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