[sdiy] Something On Topic

[JH.]

> I see you have specific modes set up for the phase shifter - are these
> pre-selected 'favorite' stage/resonance settings?

Yes. I haven't decided yet which ones I'll choose - that's why I just put
numbers on the switch positions.

> What did you base your phase shifter off of (OTA, LDR, FET, XSTR?)

Good question. Not yet decided on this.
Probably not OTA. What is "XSTR" ?

I'll either go LDR (Vactrol), or I'll use a method without lag, and put a
single Vactrol in the CV path, for some modes to have that LDR feeling,
and others to allow audio rate modulation.

If I do the latter, it may either be FETs or Diode Strings (like the HiFli
had).


> What BBD did you select for your BBD section?

The Panasonic 4096-stage (MN3005, I think) for the long range,
and a 512-stage (probably TDA1022) for the short range.

> Will you be posting schemos on this?

Yes. I've already started.
Look around in the directory:
http://www.oldcrows.net/~jhaible/matrix_fx/
I'll ad more, each time a new board is finished.

I'm not yet sure how to handle the EMS parts of the circuits.
The trapezoid (it's already posted) is far enough from the
EMS original that I can share it without a bad conscience.

Same will go for the Oscillators. 

For the filter, I'll probably black out the diode ladder and
the unique EMS recovery amplifier, but will post the HPF
section and the overall routing.

> Beautiful work.

Thank you.

JH.

 
> ----- Original Message -----
> From: "JH." <jhaible at debitel.net>
> To: <synth-diy at dropmix.xs4all.nl>
> Sent: Friday, March 10, 2006 9:42 PM
> Subject: [sdiy] Something On Topic
> 
> 
> > Here's some pictures of what I've been doing recently, which
> > you might fin interesting:
> >
> > http://www.oldcrows.net/~jhaible/matrix_fx/matrix_fx_in_progress_1.jpg
> >
> > http://www.oldcrows.net/~jhaible/matrix_fx/matrix_fx_in_progress_2.jpg
> >
> > http://www.oldcrows.net/~jhaible/matrix_fx/matrix_fx_in_progress_3.jpg
> >
> > http://www.oldcrows.net/~jhaible/matrix_fx/matrix_fx_in_progress_4.jpg
> >
> > http://www.oldcrows.net/~jhaible/matrix_fx/matrix_fx_in_progress_5.jpg
> >
> > JH.
> 
>