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Sine
Joined: Sep 10, 2007 Posts: 111 Location: Netherlands
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Posted: Mon Jul 27, 2009 12:32 pm Post subject:
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The placement of R7 looks like it could be a tempco ? |
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Tim Servo
Joined: Jul 16, 2006 Posts: 924 Location: Silicon Valley
Audio files: 11
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Posted: Mon Jul 27, 2009 2:16 pm Post subject:
Subject description: ready to go! |
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Okay Boys and Girls,
They're here and they're ready to go! The prices are:
PCB $20 ea
XR2206 chip $6.50 ea
2K Tempco $3.50 ea, less if you buy 2 or more.
Give us a shout at Magic Smoke and we'll give you more info!
Tim (bleeping and blooping with my new toy) Servo |
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Tim Servo
Joined: Jul 16, 2006 Posts: 924 Location: Silicon Valley
Audio files: 11
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Posted: Mon Jul 27, 2009 2:34 pm Post subject:
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And yes, R7 is a 2K tempco I've left the leads long on mine and have it perched on top of the LM394 transistor package. Since I've got the LM394 in a socket, I think I may actually try putting the tempco under the 394 (socket / tempco / dab of heat sink compound / LM394).
Tim (recovering from an all night XR build) Servo |
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stevenclements
Joined: Nov 16, 2005 Posts: 74 Location: Edmonton, Alberta
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Posted: Mon Jul 27, 2009 2:37 pm Post subject:
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Tim Servo wrote: | And yes, R7 is a 2K tempco I've left the leads long on mine and have it perched on top of the LM394 transistor package. Since I've got the LM394 in a socket, I think I may actually try putting the tempco under the 394 (socket / tempco / dab of heat sink compound / LM394).
Tim (recovering from an all night XR build) Servo |
...pictures of said build at 11?
_________________ http://soundcloud.com/pilfermusic
http://www.gearjunkies-userstudios.com/studio.php?stid=221
life is a treasure... dig it! |
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Tim Servo
Joined: Jul 16, 2006 Posts: 924 Location: Silicon Valley
Audio files: 11
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Posted: Mon Jul 27, 2009 3:24 pm Post subject:
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I'm going to try to post a pic tonight, but I think he's going off the "Parts Layout" image I posted on page 1 of this thread for the location and orientation of R7.
Tim (now where's that pesky digital camera?) Servo |
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CJ Miller
Joined: Jan 07, 2007 Posts: 368 Location: 127.0.0.1
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Posted: Tue Jul 28, 2009 7:08 am Post subject:
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Besides 2k tempco, 1.87k probably works as well.
I can hardly wait! |
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State Machine
Janitor
Joined: Apr 17, 2006 Posts: 2809 Location: New York
Audio files: 24
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Posted: Wed Jul 29, 2009 7:04 am Post subject:
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Hmm, now this board sounds good. I will most likely purchase some myself to ... Thanks for doing this Tim !!
Bill |
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Tim Servo
Joined: Jul 16, 2006 Posts: 924 Location: Silicon Valley
Audio files: 11
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Posted: Wed Jul 29, 2009 11:30 pm Post subject:
XR-VCO PCBs. |
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Hi Everybody,
The bad news is the first batch of XR VCO boards is sold out! The good news is that I'm going to order more. I've sent messages to everyone that I'm holding boards for, so make sure you let me know if you really don't want them. Thanks to everyone who snagged one up. The next batch should be here in about two weeks. I'm also ordering more of our other boards, as we're sold out of a couple different items.
As far as subbing a 1.87K Tempco for the 2K, that should work, but it may throw off the V/Oct circuit. I would probably compensate by changing the input resistors by an equal percentage. Right now, the circuit is set up with 100k for most inputs, and 2k for the feedback R. Just keep the ratio the same if you change the feedback R. Still, I'd say a 2K tempco is going to be easier to find than a 1.87K
Tim (got my Purchasing Dept hat on) Servo |
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fluxmonkey
Joined: Jun 24, 2005 Posts: 708 Location: cleve
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Posted: Thu Jul 30, 2009 7:56 am Post subject:
Re: XR-VCO PCBs. |
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will the next batch fix the kludge w/ the 2 resistors?
are those of us who tried to contact you but missed out, on a waiting list? (i had emailed you via the magicsmoke addy and PMed, but never heard).
thx!
bbob
Tim Servo wrote: | Hi Everybody,
The bad news is the first batch of XR VCO boards is sold out! The good news is that I'm going to order more. I've sent messages to everyone that I'm holding boards for, so make sure you let me know if you really don't want them. Thanks to everyone who snagged one up. The next batch should be here in about two weeks. I'm also ordering more of our other boards, as we're sold out of a couple different items.
As far as subbing a 1.87K Tempco for the 2K, that should work, but it may throw off the V/Oct circuit. I would probably compensate by changing the input resistors by an equal percentage. Right now, the circuit is set up with 100k for most inputs, and 2k for the feedback R. Just keep the ratio the same if you change the feedback R. Still, I'd say a 2K tempco is going to be easier to find than a 1.87K
Tim (got my Purchasing Dept hat on) Servo |
_________________ www.fluxmonkey.com |
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hway23
Joined: Jul 23, 2008 Posts: 61 Location: ks
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Posted: Mon Aug 03, 2009 2:20 pm Post subject:
Re: XR-VCO PCBs. |
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Tim Servo wrote: | Hi Everybody,
The bad news is the first batch of XR VCO boards is sold out! |
? I though it was going to be on the magic smoke website |
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reve
Joined: Feb 23, 2008 Posts: 149 Location: USA
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Posted: Fri Aug 14, 2009 10:48 am Post subject:
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Boards arrived in California yesterday. I'm assuming for Resistors and Caps with part numbers under 100 we use Scott's values?
I know docs are in process, but... it's hard to resist stuffing. |
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Tim Servo
Joined: Jul 16, 2006 Posts: 924 Location: Silicon Valley
Audio files: 11
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Posted: Fri Aug 14, 2009 11:56 am Post subject:
XR-VCO PCBs. Subject description: Parts List |
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Hi Everyone,
I've been slow to respond to people lately, as I've just been swamped with all sorts of stuff. Sorry about that. Yes, the TH-102 docs are in process, but I have attached a preliminary parts list here. It's missing a few Mouser part numbers, but it should be enough to get you started. Please check it carefully and let me know if I goofed up anything, or if there's something that doesn't make sense.
The parts numbers come from the XR-VCO schematic in Thomas' AS21C book, so those may or may not jive with the listing on Scott's site. Part numbers over 100 are parts that I added to the original schematic. Anyway, the full doc package will follow for people who have purchased boards, and the next batch of boards has been ordered and should be here on or before the 20th (according to the board house). The response on this one has been pretty big, so thanks to everyone who has purchased boards!
Tim (missing a few Mouser part numbers his self) Servo
Updated 2009-Aug-16, fixed value of C8
Description: |
TH-102 "El Cerrito" XR VCO Parts List - Updated 2009-Aug-16 |
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TH-102-02b Parts List.pdf |
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74.17 KB |
Downloaded: |
356 Time(s) |
Last edited by Tim Servo on Sun Aug 16, 2009 12:21 pm; edited 1 time in total |
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Tim Servo
Joined: Jul 16, 2006 Posts: 924 Location: Silicon Valley
Audio files: 11
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Posted: Fri Aug 14, 2009 12:07 pm Post subject:
XR-VCO PCBs. |
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A couple of additional notes:
This board will be a normal stock item for us, so we don't update the Magic Smoke site with in stock/out of stock status. Generally, if we run out of one of our boards, we order a new batch and have them in 2 - 3 weeks or less.
The new batch of boards is a Rev 02 (TH-102-02) and this will fix the problem with the two resistors going to -V instead of +V. The parts list above will work for both Rev 01 and Rev 02 boards. People should be receiving their boards in the next week or so (if they haven't already). If you've ordered boards and haven't received them, or if we haven't given you some sort of confirmation about your order status, give me a shout at Magic Smoke and tell me to get off my duff!
Thanks again to everyone!
Tim (Duff Man) Servo |
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Sound
Joined: Jun 06, 2006 Posts: 842
Audio files: 1
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Posted: Fri Aug 14, 2009 12:11 pm Post subject:
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I can see my dual "El Cerrito" Oeoeoeoee! |
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hway23
Joined: Jul 23, 2008 Posts: 61 Location: ks
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Posted: Fri Aug 14, 2009 6:01 pm Post subject:
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will there be an updated schematic for the new features? |
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Tim Servo
Joined: Jul 16, 2006 Posts: 924 Location: Silicon Valley
Audio files: 11
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Posted: Sat Aug 15, 2009 12:13 am Post subject:
XR-VCO PCBs |
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Yes, the TH-102 doc package includes a schematic with the new additions highlighted.
By the way, I've been fiddling with mine, and I've figured that it is possible to get three octaves of tones from it. If you turn the Skew control all the way up, the Tri / Sine output will sound +1 octave up from the 'fundamental' note. Since the Pulse wave is derived from the Tri/Sine, it will be one octave up also. The Rampoid and Square waves will be at the "fundamental" tone, and so will the Pulse suboctave. And then finally, the Square suboctave will be one octave below the fundamental tone. The Tri / Sine and the Pulse will change octaves depending on the setting of the Skew control, as will the Pulse suboctave. All sorts of fun
Tim (one octave up) Servo |
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reve
Joined: Feb 23, 2008 Posts: 149 Location: USA
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Posted: Sun Aug 16, 2009 11:42 am Post subject:
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Tim, the parts list you posted has C8 as a 0.022uf cap. I believe the schematics have 0.22uf listed as the value, so I thought it'd be wise to ask for a verification.
Thanks! |
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Tim Servo
Joined: Jul 16, 2006 Posts: 924 Location: Silicon Valley
Audio files: 11
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Posted: Sun Aug 16, 2009 12:27 pm Post subject:
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reve wrote: | Tim, the parts list you posted has C8 as a 0.022uf cap. I believe the schematics have 0.22uf listed as the value, so I thought it'd be wise to ask for a verification.
Thanks! |
Ah, good catch! I have corrected this and posted a new Parts List. Thanks for that.
Tim (playing catch) Servo |
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johans121
Joined: Jun 19, 2007 Posts: 178 Location: Huntsville, AL (USA)
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Posted: Sun Aug 16, 2009 7:06 pm Post subject:
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Any news when these will be back in stock? I never heard back from you after you released the first batch, and I don't want to miss out on this second one... _________________ Don't feed me Indian, you WILL regret it!
-Jim |
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Tim Servo
Joined: Jul 16, 2006 Posts: 924 Location: Silicon Valley
Audio files: 11
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Posted: Sun Aug 16, 2009 7:34 pm Post subject:
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Hi Johan,
The next batch o' boards are supposed to be here around the 20th (according to the board house). I apologize if I haven't gotten back to everyone who has asked about these boards, but I'll shout out here when they arrive.
Tim (soldering, typing, and watching The Fifth Element) Servo |
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jojjelito
Joined: Jun 27, 2007 Posts: 50 Location: Stockholm, Sweden
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Posted: Mon Aug 17, 2009 12:27 pm Post subject:
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Got my boards today. They certainly look the business! Thank you Tim |
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jwilsey
Joined: Feb 24, 2009 Posts: 31 Location: Taichung City
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Posted: Wed Aug 19, 2009 10:21 pm Post subject:
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Just got mine today- Thanks |
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loopcycle
Joined: Nov 06, 2006 Posts: 101 Location: California
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Posted: Fri Aug 21, 2009 9:56 am Post subject:
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im watching this space for when the new boards are available too. |
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reve
Joined: Feb 23, 2008 Posts: 149 Location: USA
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Posted: Mon Aug 24, 2009 9:29 am Post subject:
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Quote: | there are two resistors where you only solder in one end, and tie the other end to +V |
Say Tim, I know you're still working on the docs, but just for the sake of being deadly sure that I'm tying the right resistors to V+ on these Rev. 1 boards could you verify the part numbers?
Thanks! |
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Tim Servo
Joined: Jul 16, 2006 Posts: 924 Location: Silicon Valley
Audio files: 11
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