SynthModules

Gary Chang wrote to me with some very useful suggestions to improve
the musical usefuless of the analog shift register program that I
posted a couple of days ago. I incorporated his ideas in a complete
rewrite which I've just posted as gc-sah-sr-qua.bas. Basically, it's
now a 16-stage delay line with four variable taps. I had wanted to be
able to change the taps interactively, but it turned out to be very
diffcult to set them accurately. So for now, you just change some
constants in the program source and click the 'program' button.

Give it a clock pulse on the START input and a varying voltage on IN-1
and out come four semi-tone quantized outputs at different delay
times. The AUX output is pulsed synchronously with the incoming clock,
but it needs to be buffered to be useful; I couldn't get my 2600 EGs
or the DSC to trigger on it.

Many thanks to Gary for making his suggestions!

Woody

--- In SynthModules@yahoogroups.com, "john mahoney" <jmahoney@g...> wrote:
> Good point -- I couldn't get a Moogerfooger LFO output to trigger
the PSIM's
> Start input, but I forgot about that when I posted my happy little
review a
> few minutes ago (to AH and SDIY).
> 
> How much voltage is needed at the Start input?

Brice is the one who could give a definitive answer, but from looking
at the schematic, I'd say 5V ought to do it. Were you using a square
wave from the Moogerfooger? I think it wants to see a sharp rising edge.

----- Original Message ----- 

From: "Woody Wall" <woody_wall@hotmail.com>

> times. The AUX output is pulsed synchronously with the incoming clock,
> but it needs to be buffered to be useful; I couldn't get my 2600 EGs
> or the DSC to trigger on it.

Good point -- I couldn't get a Moogerfooger LFO output to trigger the PSIM's
Start input, but I forgot about that when I posted my happy little review a
few minutes ago (to AH and SDIY).

How much voltage is needed at the Start input?

Thanks to you guys who have built the existing PSIM code base: Brice, Grant,
Dr. Mabuse, and Woody. I hope I'm not leaving anyone out.
--
john

Anything above TTL levels will (should) trigger the START on the PSIM-1.
All you're doing is using an external signal instead of pushing the button
which sends 5V to the I/O pin on the BasicATOMPRO.  It "should" see anything
above a couple volts as HIGH.  I just measured (not very scientifically by
the way) by using a joystick controller and increasing the voltage until the
thing triggered.  I then measured the output of the joystick controller.  It
was right at 3V.

Try using either a short pulse wave or a triangle wave to trigger the
Start/Stop inputs.  I just loaded Woody's gc-sah-sr-qua.bas (GREAT program
by the way!) and I can trigger the PSIM-1's START on mine successfully using
the following:

- VC Wave Output (Blacet VCO)
- Pulse Wave Output (Blacet VCO)
- Triangle Wave (Blacet VCO)
- Saw Wave (Blacet VCO)
- Sine Wave (Blacet VCO)
- Out (Ken Stone/CGS Psycho LFO)
- Clock Out (Wiard Noise Ring)
- Both Clock Outs (Blacet Binary Zone - Normal and Short Pulse)
- Normal and Inverted Outputs (Blacet EG1)
- OUT (Blacet Dark Star Chaos)
- OUT (Wiard Joystick Controller - triggers at 3V)
- OUT (Blacet/Wiard Mini-Wave - both 5V and 10V settings using TRI Input)

Well... that's just about everything I have that can produce a signal to
trigger the Start button on the PSIM-1.

As far as using the AUX out to gate or trigger things... I can use it to
gate the following:

- Blacet EG1
- Blacet Dark Star Chaos
- Blacet Final Filtre
- Blacet Binary Zone (Gate Reset)

The AUX jack doesn't put out enough voltage to work my Blacet VCA (since it
doesn't really start to work until it gets to just over 8V), but that's the
only thing I have that I can't get to gate.

I'm running the *exact* same buffer on the AUX output as you guys.  The AUX
output on the PSIM-1 is approximately 5V out.

I hope this helps.

- Brice
http://www.SynthModules.com


----- Original Message ----- 
From: "john mahoney" <jmahoney@gate.net>
To: <SynthModules@yahoogroups.com>
Sent: Monday, March 01, 2004 11:49 PM
Subject: Re: [SynthModules] ASR rewrite


> ----- Original Message ----- 
> From: "Woody Wall" <woody_wall@hotmail.com>
>
> > times. The AUX output is pulsed synchronously with the incoming clock,
> > but it needs to be buffered to be useful; I couldn't get my 2600 EGs
> > or the DSC to trigger on it.
>
> Good point -- I couldn't get a Moogerfooger LFO output to trigger the
PSIM's
> Start input, but I forgot about that when I posted my happy little review
a
> few minutes ago (to AH and SDIY).
>
> How much voltage is needed at the Start input?
>
> Thanks to you guys who have built the existing PSIM code base: Brice,
Grant,

> Dr. Mabuse, and Woody. I hope I'm not leaving anyone out.
> --
> john
>
>
>
>
> Be sure to check out the primary Web site at:
> http://www.SynthModules.com
>
> Yahoo! Groups Links
>
>
>
>
>

(Assuming you're using a CP51) -from the on-line manual the LFO 
output is +/-2.5V, which probably isn't enough to the PSIM.  If you 
mult the LFO out to the mixer (which is unity gain) I'd think it'd 
boost the level to +/-5V, which should trigger it (the two 
LFO 'copies' adding together in phase).  Or, if you have a DC source, 
plug that into the mixer to offset it positive so it's swinging fully 
0-5V.

Cheers,
Scott
(Who doesn't have any Moogerfooger stuff, but wouldn't mind.....)


--- In SynthModules@yahoogroups.com, "john mahoney" <jmahoney@g...> 
wrote:
> ----- Original Message ----- 
> From: "Woody Wall" <woody_wall@h...>
> 
> > times. The AUX output is pulsed synchronously with the incoming 
clock,
> > but it needs to be buffered to be useful; I couldn't get my 2600 
EGs
> > or the DSC to trigger on it.
> 
> Good point -- I couldn't get a Moogerfooger LFO output to trigger 
the PSIM's
> Start input, but I forgot about that when I posted my happy little 
review a
> few minutes ago (to AH and SDIY).
> 
> How much voltage is needed at the Start input?
> 
> Thanks to you guys who have built the existing PSIM code base: 
Brice, Grant,

> Dr. Mabuse, and Woody. I hope I'm not leaving anyone out.
> --
> john

Thanks, Scott, offset is definitely the way to go. The CP-251 mixer section
has an offset voltage knob, so I'll try it.
--
john


----- Original Message ----- 

From: "youdono2001" <scottnoanh@peoplepc.com>
To: <SynthModules@yahoogroups.com>
Sent: Tuesday, March 02, 2004 5:43 PM
Subject: [SynthModules] Re: ASR rewrite


> (Assuming you're using a CP51) -from the on-line manual the LFO
> output is +/-2.5V, which probably isn't enough to the PSIM.  If you
> mult the LFO out to the mixer (which is unity gain) I'd think it'd
> boost the level to +/-5V, which should trigger it (the two
> LFO 'copies' adding together in phase).  Or, if you have a DC source,
> plug that into the mixer to offset it positive so it's swinging fully
> 0-5V.

It works: Some positive offset on the Moogerfooger LFO makes the PSIM happy.
--
john


----- Original Message ----- 
From: "john mahoney" <jmahoney@gate.net>
To: <SynthModules@yahoogroups.com>
Sent: Tuesday, March 02, 2004 6:35 PM
Subject: Re: [SynthModules] Re: ASR rewrite


> Thanks, Scott, offset is definitely the way to go. The CP-251 mixer
section

> has an offset voltage knob, so I'll try it.
> --
> john
>
>
> ----- Original Message ----- 
> From: "youdono2001" <scottnoanh@peoplepc.com>
> To: <SynthModules@yahoogroups.com>
> Sent: Tuesday, March 02, 2004 5:43 PM
> Subject: [SynthModules] Re: ASR rewrite
>
>
> > (Assuming you're using a CP51) -from the on-line manual the LFO
> > output is +/-2.5V, which probably isn't enough to the PSIM.  If you
> > mult the LFO out to the mixer (which is unity gain) I'd think it'd
> > boost the level to +/-5V, which should trigger it (the two
> > LFO 'copies' adding together in phase).  Or, if you have a DC source,
> > plug that into the mixer to offset it positive so it's swinging fully
> > 0-5V.
>

Cool!  I missed the part in the MF manual about the internal offset (I was figuring from an external source - nice to have it integral!).

Cheers,
Scott

  ----- Original Message ----- 
  From: john mahoney 
  To: SynthModules@yahoogroups.com 
  Sent: Tuesday, March 02, 2004 4:32 PM
  Subject: Re: [SynthModules] Re: ASR rewrite


  It works: Some positive offset on the Moogerfooger LFO makes the PSIM happy.
  --
  john


  ----- Original Message ----- 
  From: "john mahoney" <jmahoney@gate.net>
  To: <SynthModules@yahoogroups.com>
  Sent: Tuesday, March 02, 2004 6:35 PM
  Subject: Re: [SynthModules] Re: ASR rewrite


  > Thanks, Scott, offset is definitely the way to go. The CP-251 mixer
  section
  > has an offset voltage knob, so I'll try it.
  > --
  > john
  >
  >
  > ----- Original Message ----- 
  > From: "youdono2001" <scottnoanh@peoplepc.com>
  > To: <SynthModules@yahoogroups.com>
  > Sent: Tuesday, March 02, 2004 5:43 PM
  > Subject: [SynthModules] Re: ASR rewrite
  >
  >
  > > (Assuming you're using a CP51) -from the on-line manual the LFO
  > > output is +/-2.5V, which probably isn't enough to the PSIM.  If you
  > > mult the LFO out to the mixer (which is unity gain) I'd think it'd
  > > boost the level to +/-5V, which should trigger it (the two
  > > LFO 'copies' adding together in phase).  Or, if you have a DC source,
  > > plug that into the mixer to offset it positive so it's swinging fully
  > > 0-5V.
  >



  Be sure to check out the primary Web site at:
  http://www.SynthModules.com




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[Non-text portions of this message have been removed]

Still a couple left...

(Note: It will probably be three to six months before I do another batch of
PSIM-1 modules.  Once this batch is completed... I will be working on a few
of the add-on modules for existing customers.)

http://www.synthmodules.com/psim-1-order.htm

For those of you who have already ordered a PSIM-1... everything has been
ordered and the parts are already beginning to arrive.  The PCB's and panels
won't be in until around the 17th (if UPS delivers on time).  Then, it'll be
a mad dash to get them all built and shipped.  However... I do plan on
taking my time and doing a good job building each and every one of them.
Just ask anyone who already has one about the build quality.  So, please be
patient with me.  :-)

Also, until I get the add-on Speech module completed... if anyone is
interested in doing a little DIY and playing around with the new SpeakJet
chip, I am now an Authorized Reseller of the SpeakJet chips.  I'll be
updating the Web site in the next couple of days with additional
information.

Thanks again for all of your interest!

Best regards,

Brice D. Hornback
http://www.SynthModules.com