“SN Voice” PCB's for SALE

RobotDad · Joined: Apr 04, 2010 Posts: 9 Location: Washington

Boards still available?

State Machine · Posted: Sat Aug 28, 2010 8:18 am Post subject:

RSFC · Joined: Sep 02, 2010 Posts: 54 Location: space lab

Out of stock?

hanley · Joined: May 24, 2006 Posts: 31 Location: London

nearly finished wiring up my front panel and have a question about building the connectors from the front panel to the boards, do the wires need to be soldered onto the connectors that go into the connector or is stripping them back a bit and crimping the in enough??

cheers

State Machine · Posted: Wed Sep 29, 2010 11:13 am Post subject:

State Machine · Posted: Wed Sep 29, 2010 11:17 am Post subject:

schmidtc · Joined: May 16, 2009 Posts: 28 Location: Boston

Just picked up 3 of these. That should keep me busy. Thanks!

State Machine · Posted: Sat Oct 02, 2010 7:18 pm Post subject:

State Machine · Posted: Mon Oct 25, 2010 11:12 am Post subject:

Looks like BG Micro has lowered the price on this chip for a really nice deal !!

http://www.bgmicro.com/search.aspx?find=SN76477

I still have SN Voice boards in stock ....

Bill

jumunius · Posted: Mon Nov 08, 2010 9:01 am Post subject:

Hi, I'm finishing up my SN Voice, and I'm to the wiring part. Conveniently I have documentation on wiring from both Bill/SMS and Scott Stites, but unfortunately the pot orientations sometimes disagree. For example, the LFO rate, Attack, and Release. In rear view, does the ground go to the left/center pins of the LFO pot, and the right/center pins of Attack and Release (Scott's way)? Or the reverse (Bill's way)?

(I'm assuming neither Bill nor Scott believe in some alternate universe pot orientation where envelopes get faster at CW, while LFOs get faster at CCW. Perhaps where pitch tracks from right to left even?)

Additionally, I'd love to know what the standard is for reading pot orientation from a schematic. If a pot schematic is viewed so that the arrow is pointing upwards, are you viewing the "rear view" or "front view" of the pot? (I tried to figure this out myself, but I seemed to get conflicting results from two schematics, so better to just ask the question.)

Anyways, I know that all this is done in spare time without copy-editing staffs, and I'm always psyched to have all these diagrams to refer to. (Not to mention nicely-made PCBs.) But I'm still pretty new at this and get mixed up easily, and it's no fun to flip my pot wirings after each build. Embarassed

State Machine · Posted: Mon Nov 08, 2010 1:35 pm Post subject:

Hi

See if this helps. It all looks OK to me and follows convention. For example, LFO CCW, lower frequency. On the diagram, LFO RATE is R56. If the potentiometer is turned fully CCW, it yields the maximum resistance and thus the lowest rate.

Bill

pot_wiring.pdf

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State Machine · Posted: Mon Nov 08, 2010 1:45 pm Post subject:

jumunius · Posted: Mon Nov 08, 2010 3:58 pm Post subject:

arsonus · Joined: Apr 17, 2011 Posts: 14 Location: Slovakia

Hi,

Do you have SN Voice boards in stock? I would be interested to one PCB.

Thanks

State Machine · Posted: Tue Apr 26, 2011 7:04 pm Post subject:

Sure do, I have plenty of boards in stock

Thanks
Bill

tehskull · Posted: Wed Jun 22, 2011 2:24 pm Post subject:

Hey there. I would like to buy 1 PCB please Very Happy

State Machine · Posted: Thu Jun 23, 2011 4:07 am Post subject:

loydb · Joined: Feb 04, 2010 Posts: 290 Location: Austin, TX

Do you also sell the TI chips? I saw reference to it in some earlier posts, but no mention in post #1. I want to get two boards with chips if possible.

Thanks!

williamlee · Joined: Jun 23, 2011 Posts: 1 Location: Connecticut, USA

I am getting ready to build my SN-Voice and am very excited, but am still kind of confused over the pot wiring. I have the PDF that spells it out pretty clearly, but have a beginner question. Some of the pots list connections on J1 to +15/-15 (J1-8,J1-9). I understand that part, but others just show +15/-15, and there are a lot of connections to ground. I'm just wondering the best way to wire up these other ones. Where do people recommend I bring all the grounds together or am I wiring the ground on all of the pots to each other and then one final one to the J1-10 ground, etc.

Sorry if this is a rookie question, but I want to avoid mistakes, and the only other thing I've built with a fair number of pots on a panel is a Weird Sound Generator.

Thanks in advance!

mark_olson · Joined: Oct 26, 2006 Posts: 178 Location: Lawrence, Kansas

, williamlee!

It's been a long time since I built my SN Voice so I'm not positive how I did it. But I probably did what I usually do when there isn't a designated board connection, which is to connect to the nearest panel component iteration of whatever it is that's called for. So, if I need +15V and it is present on a lug of a nearby pot or jack, I'll just hook up to that. Mind the schematic, though, to be sure the point you connect to will always have what's called for, that is, don't connect to a point that, because of the position of some other pot or switch, will sometimes present something other than the desired value. When doing panel wiring I would not take all ground connections to a single point, but instead connect to wherever ground is nearest. I have no idea if this violates any "best practices" but so far it's always worked for me.

Good luck!

Mark

jumunius · Posted: Fri Jun 24, 2011 12:23 pm Post subject:

In my (limited) experience it seems wise to add some redundancy into your power wiring, especially the ground. So if 8 pots require a connection to ground, rather than just daisy chaining them in series, you should add a loop point or two. That way if one connection is bad or intermittent, it won't cause bugs in half your pots, but hopefully only a single pot (or none at all). Easier to isolate in troubleshooting.

I'm not sure what the official best practice is, but again, this has worked for me.

(That said, I have yet to wire my SN-Voice and now am probably going to wait a while as my current case is getting full. Sad, but it will be one of the first in my next case I'm sure.)

State Machine · Posted: Mon Jun 27, 2011 5:50 am Post subject:

State Machine · Posted: Mon Jun 27, 2011 6:05 am Post subject:

As far as common grounds and bus voltages, we are not talking any significant current carrying wires here so it's quite OK to daisy chain where possible along the front panel, ground as example, then bring it to a common point to the PC board. The 15 volt supplies can also be daisy chained since they are only biasing potentiometers of fairly high value so no high currents are flowing through those either.

Daisy chaining, however, is usually not recommended when the wires carry higher currents. For example, power supply lines. It is then prudent to run a unique wire to each circuit being powered along with it's return.

Bill