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sneakthief
Joined: Jul 24, 2006
Posts: 569
Location: Berlin
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 Posted: Wed Oct 11, 2006 8:57 am Post subject:
My twin SN-Voice |
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Hi DIY-folks!
I'm just finishing up a modular rack which includes two Henry/Stites SN-Voices.
I just finished wiring up the first one:
RATS NEST! haha - I've got no experience in etching so I did it the old-fashioned point-to-point way. I used a couple of BCD code switches to control the on-board mixing. They're hooked up to a 556 timer 
And here's the panel-design:
(including a CGS Bi-N-Tic, CGS Synthacon & Polivoks)
Cheers,
michel
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sneakthief
Joined: Jul 24, 2006
Posts: 569
Location: Berlin
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| Posted: Wed Oct 11, 2006 9:19 am Post subject:
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oh by the way, a big thanks to Thomas Henry & Scott Stites for this lovely project. I tested it and everything seemed to work fine
I'll have samples soon.
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Scott Stites
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Joined: Dec 23, 2005
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Location: Mount Hope, KS USA
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| Posted: Wed Oct 11, 2006 10:12 am Post subject:
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Wow - pretty cool stuff!! I'd love to hear sample of it, especially with your mods. I'll point Thomas to this, he'll probably get a kick out of it.
Cheers,
Scott |
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sneakthief
Joined: Jul 24, 2006
Posts: 569
Location: Berlin
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| Posted: Wed Oct 11, 2006 11:18 am Post subject:
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Samples tomorrow, I promise
Re. 556 Mixer - the switch that's labelled 555 on the top will have three settings:
left position - 1/2 of 556 controls 5 volt on/off pulses to envelope mixer
middle position - no 556 control
right position - both 556's in action
should be fun!
background: the SN-76477 has 8 different possible mixing modes that are controlled by 3 pins on the mixer:
And I stole the idea from here:
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questionable
Joined: Aug 27, 2006
Posts: 42
Location: southern california
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| Posted: Wed Oct 11, 2006 5:59 pm Post subject:
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Very cool. Look forward to some samples.
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State Machine
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Location: New York
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| Posted: Thu Oct 12, 2006 6:50 am Post subject:
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Very nice work. I really like the front panel work. Who is the manufacturer name and what are the part numbers of the pots you use? Also, who is your source for the knobs?
I do have a suggestion for your breadboard. You can commit them to to PCB's fairly cheaply if you use "Express PCB" prototype services. You can get (3) 2.5" x 3.8" double sided boards for $51.00 bucks plus shipping. I know you are in Berlin so I don't know how much that would be.
http://www.expresspcb.com/ExpressPCBHtm/Costs.htm
Look forward to your sound samples !
Bill |
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questionable
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sneakthief
Joined: Jul 24, 2006
Posts: 569
Location: Berlin
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| Posted: Thu Oct 12, 2006 10:39 am Post subject:
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Re. Pots - they're 16mm Alpha's from Futurlec.com - $0.50 each but cheaper when you buy over 50 or 100. They have a beautiful stiff fluid feel, but probably only have tolerances of ~10% - in the worst case scenario, a 100k pot may only go up to 90k.
Re. Knobs - oh I love 'em! Questionable is corect - they're the soft-touch Rean knobs that Blacet uses, but with a shinier surface. I got mine from http://www.rapidonline.com/ in the UK for 9p apiece ($0.17US).
Re. PCB's - I mainly make a living from music so I have more time than money *lol* So making my own PCB is fun - besides, I also don't have any circuit layout experience! So in the end it was quicker for me to solder it point-to-point.
Re. Front panel - thanks for the nice words, State Machine! Once again I'm using some ghetto-ass embossed Dymo for labelling. Not exactly purty, but certainly old-school 
Samples coming later on today, I promise. I haven't done the v/oct calibration yet, so it'll sound a wee bit atonal
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State Machine
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| Posted: Thu Oct 12, 2006 11:10 am Post subject:
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Hey thanks guys (Questionable and Sneakthief) for your replies! Yes, I enquired about those knobs because they really did look like the Blacet ones! Thanks for the info on those!
| Quote: | | Re. Front panel - thanks for the nice words, State Machine! Once again I'm using some ghetto-ass embossed Dymo for labelling. Not exactly purty, but certainly old-school |
The black finish is very striking AND the knobs are all in "straight lines"! I love it! I am a bit compulsive about those sorts of things  Thats OK about the labels, I have three SSM2164 VCA based prototypes I am building and those front panels are done with my Brother P-Touch label machine ... GRIN ....
| Quote: | | Re. PCB's - I mainly make a living from music so I have more time than money *lol* So making my own PCB is fun - besides, I also don't have any circuit layout experience! So in the end it was quicker for me to solder it point-to-point. |
I understand, sure. I have wire wrapped and did P2P for a great many years if the frequency of operation justified just such a method. Perfectly valid my friend! Higher frequencies and more "sensitive" type circuits required a copper clad board for a ground plane and I then used "dead bug" soldering techniques (IC's on their backs with wiring soldered directly to the IC pins). The ultimate was the use of a PCB.
I find though when doing wire wrap style prototyping, I like to use component carriers (16 PIN DIP TYPE) and solder resistors, caps, diodes, etc .. onto them, put those in WW sockets and then wire wrap them as if they were IC's. This will produce a much tighter fitting board.
After my current project, I have two SN76477's to build up a nice dual SN voice also! I plan a PCB for it also.
I also have a "Speak Jet" chip I have been wanting to do a design with complete with MIDI control: (I really think this is cool !!!)
http://www.speechchips.com/downloads/speakjetusermanual.pdf
http://www.speechchips.com/shop/item.asp?itemid=5&gclid=CLOmsrGQ9IcCFSGtYAod7BEkfg
Chat soon,
Bill |
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sneakthief
Joined: Jul 24, 2006
Posts: 569
Location: Berlin
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| Posted: Thu Oct 12, 2006 11:36 am Post subject:
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Bill, before you run off and layout a PCB, you may be interested in the following: I was chatting to Tim aka Servo at Magic Smoke: he designed a PCB and was testing it last I heard from him. I may be able to twist his rubber arm and see if he'll share it.
Re. knobs - on Blacet's tech page (http://blacet.com/tech.html), he lists his knobs:
Rean knobs (Mouser 550-67002)
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sneakthief
Joined: Jul 24, 2006
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Location: Berlin
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| Posted: Thu Oct 12, 2006 11:42 am Post subject:
Noise CV output mod? |
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Scott - do you think the following DSC2000 Noise Clock output mod is possible for the SN-Voice? (as seen on the Cynthia DSC)
It seems to be grabbing a CV-output signal from pin 16 & buffering it. Would this disturb the delicate PWM setup the you guys designed?
| Quote: |
Mod 3: Bring out the filtered noise clock as a separate CV output.
This mod is my personal favorite, allowing you to use the Dark Star's noise clock and filter circuits to modulate external VCOs instead of the internal one, to modulate filters, or as its own audio source.
USE THE FOLLOWING PROCEDURE IF YOUR BOARD IS MARKED REV 0 (old issue):
Parts required: hookup wire, either one jack or one SPDT switch. You'll need a sharp X-Acto knife to cut one trace.
Find IC4 on the pcb (look to the lower left, with the board oriented so you can read the CHAOS logo.) It's a quad opamp, but only 3 of the 4 amps are currently used. We are going to use the 4th opamp to buffer pin 16 of IC9, the main sound generator IC. This signal gives you the output of the noise clock and clock filter. The output of the opamp can go to either its own dedicated jack, or a SPDT switch (shown next to the output jack above) which you wire to switch the output jack between this signal and the normal output signal. You will be working on the solder side of the pcb. First you must cut a trace from pin 10 to pin 12 of IC4, which grounds the (previously) unused input to the opamp. See here for the correct location to cut. Solder a hookup wire from pin 12 of IC4 to pin 16 of IC9. Remember that the board is upside down, so don't get your pin numbers confused. Then solder a hookup wire from pin 14 of IC4 to either your output jack or your output switch. Remember that the clocked noise signal will run continuously, since you have tapped in before the built in VCA. Also, only the CLOCK and FILTER pots will have any effect on the sound when using this output.
USE THE FOLLOWING PROCEDURE IF YOUR BOARD IS MARKED REV A (courtesy John Blacet):
Parts required: hookup wire, 0.1uF mylar cap, 1M resistor, 100 ohm resistor. You'll need a sharp X-Acto knife to cut one trace.
Locate IC4 and cut the trace going to pin 12 on the component side of the PCB (you need to do this before board assembly.) Assemble the rest of the board in normal fashion, then wire the 0.1uF cap from pin 12 of U4 to pin 6 of U8. Wire the 1M resistor from pin 12 of U4 to common. Connect pin 14 of U4 thru the 100 ohm resistor to the CLK OUT front panel jack.
What we are doing here is using a spare opamp section to buffer the output of the noise filter. The cap is used to center the signal around ground; it normally has a +V bias. The 1M resistor is used as a current source for the opamp section, and the 100 ohm resistor is for opamp output protection.
Note that this output will always be on, regardless of the GATE signal.
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http://www.hotrodmotm.com/ds_mods.htm
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Scott Stites
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| Posted: Thu Oct 12, 2006 2:16 pm Post subject:
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I think if it's buffered, it really shouldn't affect anything - it's something I've thought about doing meself.
Cheers,
Scott |
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sneakthief
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sneakthief
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| Posted: Thu Oct 12, 2006 3:15 pm Post subject:
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btw, the 556 mixer isn't ready yet - samples for that are forthcoming. actually, i'm just gonna call it a "555" from now on. it sounds better. i don't care that it isn't  
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Last edited by sneakthief on Thu Oct 12, 2006 5:16 pm; edited 1 time in total |
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questionable
Joined: Aug 27, 2006
Posts: 42
Location: southern california
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| Posted: Thu Oct 12, 2006 5:00 pm Post subject:
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thanks for the sounds, sneak. good variety of sounds from that little project. adding it to my to-do list right now.
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State Machine
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| Posted: Thu Oct 12, 2006 7:14 pm Post subject:
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| Quote: | | Bill, before you run off and layout a PCB, you may be interested in the following: I was chatting to Tim aka Servo at Magic Smoke: he designed a PCB and was testing it last I heard from him. I may be able to twist his rubber arm and see if he'll share it. |
Sure, that would save time! I will purchase a PCB or two from him if he is willing. Let me know, or, should I contact him myself and say "Sneakthief" sent me?
Thanks for the cool sounds BTW !!!! |
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sneakthief
Joined: Jul 24, 2006
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| Posted: Fri Oct 13, 2006 12:21 am Post subject:
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| State Machine wrote: | should I contact him myself and say "Sneakthief" sent me?
Thanks for the cool sounds BTW !!!! |
No prob - after posting all those pics, I think I might be lynched if I didn't 
I have no idea if he's going to make pcb's - I e-mailed Tim and am awaiting his response. At the very least I think I can twist his arm for a layout.
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questionable
Joined: Aug 27, 2006
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| Posted: Fri Oct 13, 2006 1:13 pm Post subject:
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If Tim is reading this, I'd be interested in a PCB as well if he goes that direction.
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Scott Stites
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| Posted: Fri Oct 13, 2006 2:55 pm Post subject:
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Oh, dang - how did I miss these samples yesterday?
Great work, Sneakthief! I'm going to have to link to this thread from the SN-Voice page.
Cheers,
Scott |
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State Machine
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| Posted: Sun Oct 15, 2006 8:28 am Post subject:
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| Quote: | | If Tim is reading this, I'd be interested in a PCB as well if he goes that direction. |
Well, If he does not, I will, so I will make extras. I will have to keep track of this sort of thread because this type of subject has come up before where some people want PCB's that others have done. Maybe a another topic area called "DIY PCB CHAT" or something ... ??
For now, If I make a PCB available for a project, I will just post an announcement in the DIY area so keep your eyes open for them ... . For the past few months I have been doing a large project for myself and that has taken up large amounts of my time. When thats done, I can try and serve the DIY community more often.
Bill |
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sneakthief
Joined: Jul 24, 2006
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| Posted: Sun Oct 15, 2006 2:57 pm Post subject:
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I haven't heard back from Tim yet, so I'll assume that he's busy with Magic Smoke-related items and doesn't have time.
Bill, I think that would be fantastic if you made PCB's! I would definitely buy a couple from you
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questionable
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| Posted: Sun Oct 15, 2006 5:59 pm Post subject:
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Yeah, I'll keep my eyes peeled for your announcement.
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State Machine
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| Posted: Wed Oct 18, 2006 7:36 am Post subject:
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| Quote: | | Bill, I think that would be fantastic if you made PCB's! I would definitely buy a couple from you |
I just wanted you guys to know what I plan for this PCB. I am not a big fan of "flying leads" off my boards so I plan to use 0.1" spaced MOLEX "KK" series vertical locking headers on the board so that a proper connector housing can be connected to the board. I will supply all the part numbers from the "Mouser" catalog for the mates. This will include housing and terminal part numbers. They are very inexpensive. No need for a crimper since soldering does a nice job.
I will also be using the 8-Pin DIP package for the "super matched" transistor pair.
The board will be designed for the SN76477 0.6" WIDE DIP package. If I get enough requests, I will also accommodate the "skinny" package also. I will just have to get the dimensions and make a custom printed circuit "footprint" for the skinny device.
I also plan to place an on-board 5 volt regulator to eliminate the requirement of a 5 VDC input.
I am in the midst of entering the SN-Voice schematic into the layout software.
I will be on vacation next week but will pick up on this when I get back.
Bill |
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questionable
Joined: Aug 27, 2006
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| Posted: Wed Oct 18, 2006 7:40 am Post subject:
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Sounds great. Thanks!
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State Machine
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| Posted: Wed Oct 18, 2006 10:53 am Post subject:
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| Quote: | | Sounds great. Thanks! |
Your welcome! Just got done making a custom library component in the schematic editor for the SN76477 IC since I had none in my library. The schematic is coming along.
Bill |
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