Matrix 6 noise generator clone

[>>>marjan<<<]

Hi,

> I tried to build the Oberheim Matrix 6 noise generator from the schematics at Marjan's site.
> But instead of a noise generator, I get a high frequency oscillator. It oscillates at around 800 kHz with a TL072 or an NE 5532. If I change the IC to a MC1458, there is no oscillation, but also no noise.
> I tried different trannies as noise source, among them a 2N3704.
> Anyone else have built this? Are the schematics correct? Marjan? Anybody?

First it's my mistake, tranny must be reversed, replace E and C.
I have _very_ fuzzy M6 schem so I _think_ that left resistor
in opamap feedback is 4M7 not 4K7 (btw I checked early arp ody
noise gen its almost the same but it uses both 4M7 resistors
in feedback, try this also).
Osc was from T network in feedback. Please try this changes
and inform us about the results. Maybe additional 22p across
the opamap for comp?
I'll upload new noise schem tonight (if anyone has some sugestion
about this cct or others on my site pls tell me)
btw my site is up again
http://www.marjansystems.co.yu


marjan