My twin SN-Voice

State Machine · Posted: Fri Oct 20, 2006 5:27 pm Post subject:

The SN Voice schematic diagram has been redrawn and checked against the original. Now I am ready to layout the printed circuit board. This will take a bit of time as I am not using an autorouter software package right now. That will change later this year as I will be aquiring some nice "autorouting" PCB software and schematic editor.

The board will has (3) 12-Pin connectors on it. I will be supplying a double sided, silk screened, green solder masked PCB, and, most likely connector kits, including wire, to make up the the mating connectors for the SN-Voice board. Along with this will be documentation showing the interconnects and wire diagrams to all pots and switches. I am not looking to make money on this so I will come up with a fair price for all who want boards.

More later ........

Bill

questionable · Posted: Fri Oct 20, 2006 5:29 pm Post subject:

very cool. thanks.

Scott Stites · Posted: Fri Oct 20, 2006 6:03 pm Post subject:

Spiff. Do you plan on putting any extra pads for expansion on relevant pins (like the mixer pins for example)?

Also - have you spotted any sockets that will accomodate the skinny SN76477s? I've got one that I received with my DSC2000 board from Blacet a few years back, but I haven't checked a source for them.

Sounds like it's going to be a top grade board!

Cheers,
Scott

State Machine · Posted: Sat Oct 21, 2006 4:59 am Post subject:

State Machine · Posted: Sat Oct 21, 2006 5:01 am Post subject:

State Machine · Posted: Sat Oct 21, 2006 8:19 pm Post subject:

Here is part of a prototype I have been working on that illustrates the type of connectors that will be used on the SN-Voice circuit card assembly.

These happen to be three high quality SSM2164 based VCA's prototype boards as part of a larger RISC-Controller based modulator I have been building.

Bill

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State Machine · Posted: Sun Nov 05, 2006 12:32 pm Post subject:

questionable · Posted: Sun Nov 05, 2006 1:13 pm Post subject:

sounds good, looking forward to it. hope your vacation was nice.

State Machine · Posted: Sun Nov 05, 2006 6:56 pm Post subject:

Here is the Stites/Henry SN Voice circuit card component layout! Things are moving along Very Happy

Now, time to lay in the traces and ground planes ..... nothing is real critical here...

The PC board is 2.75" x 5.00" so it will fit in most form factors ........

Bill

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sneakthief · Joined: Jul 24, 2006 Posts: 569 Location: Berlin

hot damn! that's a nice looking layout.

especially compared to this chaos:

Posted Image, might have been reduced in size. Click Image to view fullscreen.

Posted Image, might have been reduced in size. Click Image to view fullscreen.

sneakthief · Joined: Jul 24, 2006 Posts: 569 Location: Berlin

Bill - can you make sure to put solder pads for pins 25, 26 & 27? This will allow for control of the mixer circuit.

glad you put lots of room for c16 (0.47uF mylar) - the one i got is huge.

i'm shocked at how accurately this VCO tracks - i'm getting almost 7 or 8 octaves out of it. it's almost as accurate as my blacet vco.

in the next day or so i'll be posting some nutty duophonic samples using both SN-Voices together as well as the 2 pulse lfo's from each 556 modulating the mixer-logic.

State Machine · Posted: Mon Nov 06, 2006 6:06 pm Post subject:

Uncle Krunkus · Posted: Tue Nov 07, 2006 1:24 am Post subject:

You're doing some really nice looking work SM.
If I didn't have a to do list a mile long I'd build one of these.
Well, maybe one day.

sneakthief · Joined: Jul 24, 2006 Posts: 569 Location: Berlin

Bill - thanks for adding those Smile

To summarize my experience, when it comes to bang-for-the-buck, it's hard to beat the features of an SN-Voice (~$45 US for parts, not including PCB):

Voices:
- PWM VCO
- digital noise generator
- audio-rate LFO
- Triangle VCO (separate output)

CV Outputs:
- Attack/Release EG
- LFO

CV/Gate Inputs
- 1v/oct fm
- exponential fm
- linear fm
- noise sweep
- noise sweep keyboard tracking
- gate

Controls:
- Attack/Release
- adjustable AR EG curve
- envelope enable/disable
- LFO speed
- LFO range: lo/med/hi
- Noise Sweep
- Noise Filter

State Machine · Posted: Tue Nov 07, 2006 10:27 am Post subject:

Scott Stites · Posted: Tue Nov 07, 2006 11:37 am Post subject:

State Machine · Posted: Wed Nov 08, 2006 6:45 am Post subject:

State Machine · Posted: Wed Nov 08, 2006 5:08 pm Post subject:

Just got a done with the skinny footprint! I just got a few tips from tech support at expressPCB and they were very helpful. I figured I would research it since I also had to create an 80 pin PQFP package with 0.5mm pitch. Here is a partial view of the SN Voice PC board illustrating that either a skinny or wide DIP package can now be used in the board.

Bill

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Scott Stites · Posted: Wed Nov 08, 2006 7:22 pm Post subject:

Groovy!

questionable · Posted: Wed Nov 08, 2006 7:25 pm Post subject:

yeah, good solution there.

The Alison Project · Posted: Wed Nov 08, 2006 9:40 pm Post subject:

State Machine, looking forward to the boards becoming available. Thanks in advance.

State Machine · Posted: Thu Nov 09, 2006 6:53 am Post subject:

Joel · Joined: Sep 12, 2006 Posts: 97 Location: London, UK

sounds excellent! any chance those kits might find their way over to the uk?

germaniac · Posted: Thu Nov 09, 2006 11:23 am Post subject:

State Machine · Posted: Thu Nov 09, 2006 11:26 am Post subject: