[sdiy] 808 Q35

Pete Hartman pete.hartman at gmail.com
Mon Jan 30 14:42:27 CET 2017

White noise was used by the clap and the snare, pink noise was filtered
from the white noise and used by the toms.  So yeah, BD has no noise in it.

On Mon, Jan 30, 2017 at 3:36 AM, Jarno Verhoeven <jarno.verhoeven at ziggo.nl>

> I think I recall eiter Ian Fritz or Roman saying that the "colour" of the
> noise differs, and that the transistors that create the most noise (a
> parameter often used for selecting transistors), do not necessarily create
> the most even "white" noise.
> So for the 808 they might have had a certain spec for the frequency
> content of the noise.
> Hardly an industrial grade process, it seems.
> Regards, Jarno
> Verzonden vanaf mijn Samsung-apparaat
> -------- Oorspronkelijk bericht --------
> Van: matt holland <matt at mattholland.org>
> Datum: 30-01-2017 09:37 (GMT+01:00)
> Aan: synth-diy at synth-diy.org
> Onderwerp: [sdiy] 808 Q35
> I just finished watching the 808 documentary which concludes with an
> interview of an elderly kakehashi-san founder of Roland. He tells a tale of
> buying defective transistors that were "noisy" and that those were the key
> to the 808 sound. Then in a sidebar, the schematic of the white and pink
> noise generator circuit is shown with Q35 circled. The doc closes with him
> claiming that they had to stop production when they weren't able to source
> these particular transistors anymore. Has anyone else seen this doc? I
> didn't think noise circuits were that picky about transistors but I haven't
> made any myself. I'm also pretty sure the BD circuit doesn't use it, which
> 90% of the doc focused on. Wondering what your takes are.
> mh
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