[sdiy] replacement transistor DB/parametric search

Michael E Caloroso mec.forumreader at gmail.com
Fri Apr 16 18:37:50 CEST 2021


A good example of substitution error is the 2N3905 vs 2N3906.  This
database shows they are identical.  But one missing crucial parametric
is hfe range.  Old Oberheims use 2N3905.  If you substituted them with
a 2N3906 in the Fc mod of the VCF, the scaling of the circuit will be
off.  Especially in a homogenous polysynth like the OBX or SEM
polysynths.

MC

On 4/16/21, Jean-Pierre Desrochers <jpdesroc at oricom.ca> wrote:
> Check the attached ZIP file..
>
> Transistors database..


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