Search found 496 matches

by adamstan
Fri Sep 14, 2007 11:33 pm
Forum: General Synthesizers
Topic: Does 100% analog polys exists ?
Replies: 33
Views: 3130

Impossible... Except of course things like full polyphony - complete voice for each key. But voice assignement without ANY digital circuitry (that means, without logic circuits and memory) - IMPOSSIBLE. You may try to make it DISCRETE=build every single gate and flip-flop from discrete components, b...
by adamstan
Wed Sep 12, 2007 4:43 pm
Forum: General Synthesizers
Topic: Hot DCO Discussion!
Replies: 54
Views: 6173

Actually, the Juno (6 and presumably 60 too, which is what I think we're talking about) creates its PWM wave by feeding the sawtooth into one input of a comparator, and a multiplexed CV (from the PW mod section) into the other. It's an MC14051 analogue multiplexer. Thanks for that info. I was looki...
by adamstan
Tue Sep 11, 2007 10:09 pm
Forum: General Synthesizers
Topic: Hot DCO Discussion!
Replies: 54
Views: 6173

Just to clarify are you disagreeing with Bitrex's explanation or our interpretation? In Juno, square wave from 8253 is fed into MC5543, which performs integrating, and produces square with PWM. I'm not sure, how the chip works, however, as you say I was actually trying to figure out how the pulse w...
by adamstan
Tue Sep 11, 2007 9:31 pm
Forum: General Synthesizers
Topic: Hot DCO Discussion!
Replies: 54
Views: 6173

Earlier on there were claims that there was a major difference between this [Juno-106 DCO] method and the new Dave Smith oscilators. Any info on how they differ? Well it looks from what bitrex wrote, the saw waves on the Juno operate on the same principal as DSI, using a charge/discharge capacitor ...
by adamstan
Fri Sep 07, 2007 10:03 pm
Forum: General Synthesizers
Topic: Hot DCO Discussion!
Replies: 54
Views: 6173

The only DCO design that can make that claim are Dave Smith's DCO design The other is Siel DK600/Opera 6 - here the pulse train is obtained from divider chip, driven by analogue (SSM2031) VCO. There are two VCOs, and two divider chips (one for OSC A, another for OSC B). So it behaves really 'analog...
by adamstan
Fri Sep 07, 2007 10:59 am
Forum: General Synthesizers
Topic: Beware the storm that gathers here...
Replies: 736
Views: 132106

there was a spot of talk last week about "charged-cap" components helping the new synth sound quite a bit more as if it had vco's. Could anyone with better electronics knowledge than myself possibly help explain the physics of how this comes about ? :hippy2: :sad4: In VCO, sawtooth wave is generate...
by adamstan
Wed Aug 22, 2007 9:32 am
Forum: General Synthesizers
Topic: Beware the storm that gathers here...
Replies: 736
Views: 132106

So is DCO in P08 the integrator synced by the pulses (like in most 80's polys)? If it is - then its certainly analog.
by adamstan
Wed Aug 15, 2007 12:50 am
Forum: General Synthesizers
Topic: Beware the storm that gathers here...
Replies: 736
Views: 132106

wow, niceee. so what sound circuitry will it be based on ? discrete, some ICS, old ICs(CEM,SSM) etc ?? will it have a porogramming panel too ? I think it may be called an "OP-AMP based" synth. It will feature two Rene Schmitz's VCO4 per voice, (one with simple flip-flop sub-osc and traingle/sine wa...
by adamstan
Wed Aug 15, 2007 12:36 am
Forum: General Synthesizers
Topic: Beware the storm that gathers here...
Replies: 736
Views: 132106

Most every synth made today is quite physically capable of handling multitimbral mode; it's just he software that limits it. That's not true for analog synths. If you want to make it multitimbral, you have to add a whole set of CV output circuits for each part. So, let's say, that you have a polysy...
by adamstan
Fri Jun 08, 2007 10:46 pm
Forum: General Synthesizers
Topic: DX7 rant: what the h**l were they thining?!?!
Replies: 36
Views: 12117

I don't know what kind of menu diving people talk abaut, are there any on later DX7 models? Mine is Mk I and there is one of the simplest user interface on one of those more complicated synths.
MkII is even better, because display is bigger - 2x40 :-)
by adamstan
Fri Jun 08, 2007 2:34 pm
Forum: General Synthesizers
Topic: Non vintage synth with those vintage sounds for under $1500
Replies: 10
Views: 3960

Huppo wrote:
Stab Frenzy wrote:Also check out the Alesis Fusion.
yeah, what he said. 6HD are getting cheaper all the time. <$500USD last I checked.
Why, oh why are they getting cheaper only in US?? In Europe they still are well over $1k in most shops...
by adamstan
Mon May 28, 2007 12:22 pm
Forum: HELP!
Topic: TMS3631 divider chip info needed (how to program it?)
Replies: 9
Views: 2914

TMS3631 divider chip info needed (how to program it?)

Hello As it looks impossible to find OS for SIEL Opera (and MIDI reception is screwed on mine), I decided to write my own, using modern ATMEGA32 uC mounted on daugtherboard. I'm going to add some features, like CC sending and reception. Parts of code responsible for voice allocation, knobs scanning ...
by adamstan
Fri May 25, 2007 10:41 am
Forum: HELP!
Topic: Siel DK600/Opera 6 ROM dump needed
Replies: 6
Views: 397

BUMP I've checked it again searching for eaten tracks, loose connections, non-working port drivers etc, and found nothing. Hardware seems to be OK. It just completely ignores NoteOff messages - and that looks like a software bug to me. So I need these rom files really badly. The only other way would...
by adamstan
Sun May 06, 2007 10:10 pm
Forum: The Listening Lounge
Topic: Creating tracks entirely with a single monosynth
Replies: 62
Views: 6854

AG - really nice track ;-)
by adamstan
Thu Apr 12, 2007 10:34 pm
Forum: HELP!
Topic: Siel DK600/Opera 6 ROM dump needed
Replies: 6
Views: 397

Siel DK600/Opera 6 ROM dump needed

Hello It looks like my Opera needs new OS. I have posted about it few months ago, but that post was so old it have disappeared. Maybe in the meantime someone had found these files somewhere? My synth does two strange things: - It doesn't respond to Note_Off via MIDI, Note_On works. - tape input does...