[sdiy] Transistor questions

[David G Dixon]

Yes Gordon, I understand modeling (I am a professional mathematical modeler
in the extractive metallurgy space, and yes, I spell modeling with one L).
However, these are Spice models, so presumably the actual parameters of the
components are represented therein.

 

-----Original Message-----
From: Synth-diy [mailto:synth-diy-bounces at synth-diy.org] On Behalf Of
Gordonjcp
Sent: Monday, March 03, 2025 2:17 AM
To: synth-diy at synth-diy.org
Subject: Re: [sdiy] Transistor questions

[CAUTION: Non-UBC Email]

On Sun, Mar 02, 2025 at 09:16:13PM -0800, David G Dixon via Synth-diy wrote:
>  
> My question is this: given that the 2N390X transistors have higher
> transition frequencies and lower collector capacitances than the old
> Japanese transistors (according to All Transistors), why should the latter
> give significantly faster saw reset times?  What is the actual figure of
> merit for this?

It's a different model. You could make a model with an infinitely fast reset
time, or one that takes ten minutes.

Because it's a simulation it only bears a superficial resemblance to
reality.

-- 
Gordonjcp

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