[sdiy] Buchla 266 fluctuating voltages

[Czech Martin]

The LM336 which is also used in said pages is certainly no
zener effect driven circuit, but a bandgap circuit with
several amplifier stages, intended for reference voltage generation.

So it is not very surprising that it is very poor as white noise source.

m.c.

> -----Original Message-----
> From: owner-synth-diy at dropmix.xs4all.nl
> [mailto:owner-synth-diy at dropmix.xs4all.nl]On Behalf Of john mahoney
> Sent: Dienstag, 8. Juni 2004 00:06
> To: synth-diy at dropmix.xs4all.nl
> Subject: Re: [sdiy] Buchla 266 fluctuating voltages
> 
> 
> Hiya, kids! I was on vacation for a week, in Toronto with the 
> Missus. So,
> there goes the neighborhood again. ;-)
> 
> 
> Here is a web page with 2 audio samples of the MM5837:
> http://www.ciphersbyritter.com/NOISE/NOISRC.HTM
> Listen to the long sample and the looping should be obvious.
> 
> This is a textbook case of something that measures well but 
> sounds like
> crap! Look at the graph -- it shows a beautifully balanced frequency
> spectrum. As Harry wrote, the chip is useful for some things 
> but it's lousy
> as a noise source for a synth.
> 
> The Korg Mono/Poly originally used the MM5837, but later 
> models had analog
> noise sources.
> --
> john
> 
> 
> ----- Original Message ----- 
> From: "harrybissell" <harrybissell at prodigy.net>
> To: <music.maker at gte.net>
> Cc: <synth-diy at dropmix.xs4all.nl>
> Sent: Sunday, May 30, 2004 5:40 PM
> Subject: Re: [sdiy] Buchla 266 fluctuating voltages
> 
> 
> > Of course the 5837  (the only known chip to SUCK MORE than 
> a bbd...) is
> the
> > perfect example of a too-short shift register with a 
> too-low clock rate.
> >
> > For its intended purpose, an audio noise source for room equalizing
> instruments...
> > the
> > warts will really not matter, its 'good enough' for 1/3 
> octave, yes ???
> >
> > As a synthesizer noise source, it, well... sucks :^P
> >
> > H^) harry
> >
> 
>