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Tim Servo
Joined: Jul 16, 2006 Posts: 924 Location: Silicon Valley
Audio files: 11
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Posted: Mon Oct 13, 2008 10:47 am Post subject:
AS21C "Super LFO" PCBs available |
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Call it the "Super LFO," call it the "TH-301," call it the "Cucamonga," call it the "LFO with the three page schematic from Thomas Henry's AS21C book," call it anything you like, but we finally have some available!
With some assistance from the ever-talented Dave Brown, we've finished shaking down the first run of PCBs for the TH-301 "Cucamonga" LFO. This is a nifty little unit with some interesting features:
*VC frequency
*Selectable Sine, Tri, Saw or Ramp output
*Gate and Trigger outputs
*Sync Input
*Built in Lag function for delayed vibrato and other similar effects
*Built in Delay (acts like a gate delay) to delay the onset of the "Lag" function
*Delay time period can be started by a keyboard gate (or other similar signal) or by an NC footswitch
*LED frequency indicator, since we all like blinky lights!
PLEASE KEEP IN MIND: These boards are Rev01. As such, they need a few tweaks for things that will be fixed on a later rev. You'll need to do two cuts, add two jumpers, and add a couple of parts. I would NOT recommend this for a first project. You really should have built a few things before this, and have an oscilloscope for tweaking the waveform trims. Still, if you've been wanting a very full-featured LFO, this just might do the trick for you. The LFO schematic in AS21C really is a three pager, so this is something you'll definitely want a PCB for. To my knowlege, Scott Stites is the only person brave enough to have attempted this circuit on a breadboard (more likely two or more breadboards). Note that you'll need an 8038 function gen chip, LM555 timer, 3080 OTA, TL074 quad op amp, 1458 dual op amp and CD4016 analog switch chips for this board.
The normal selling price for the TH-301 LFO board will be $20, but we have about ten of the Rev01 boards and since they need the tweaks mentioned above, we're selling them for $12 each. Shipping will be $3.50 in North America, and $5.50 to UK/EU/Aus. If you're interested, PayPal funds to magsmoke@gmail.com. If you need more info, either shout out here, or send us a message at the magsmoke Gmail address.
Again, I have to give a huge THANK YOU to Dave Brown for helping with this. I've got other Magic Smoke projects in the pipeline, we've just reissued two Thomas Henry books (with another on the way), and our day jobs keep John and I hopping, so there is NO way we could have gotten the TH-301 out the door this soon without some extra assistance. Dave was a great help, and as always, has made a nifty web page with some details and o-scope screen shots:
http://modularsynthesis.com/magicsmoke/as21c-lfo/lfo.htm
Other AS21C boards will follow, but I wanted to get the most complicated PCB finished first. I should have a TH-301 "Cucamonga" with a quickie DIY face panel at the AH Nor Cal show on the 25th if you want to come check it out (and you happen to be in northern California).
Cheers!
Tim (happens to be in northern California) Servo |
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bugbrand
Joined: Nov 27, 2005 Posts: 846 Location: Bristol, UK
Audio files: 1
G2 patch files: 1
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Posted: Mon Oct 13, 2008 12:28 pm Post subject:
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Looks like another great one!
...only thing being that the 8038 is kind of expensive/rare these days...
Still seems to be listed around various places, but often at over $15 or so (actually, that isn't *really* too bad, is it?!) _________________ http://www.bugbrand.co.uk
http://www.bugbrand.blogspot.com |
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bubblechamber
Joined: Nov 04, 2006 Posts: 279 Location: NYC
Audio files: 1
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Posted: Mon Oct 13, 2008 12:59 pm Post subject:
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my good deed for the week. 8038 for $3.50 each. please don't take them all...
i order from this guy all the time, small orders can be a little slow, but his prices make up for it.
http://198.170.117.30/IC/HARRIS.html _________________ You can check your anatomy all you want, and even though there may be normal variation, when it comes right down to it, this far inside the head it all looks the same. |
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Tim Servo
Joined: Jul 16, 2006 Posts: 924 Location: Silicon Valley
Audio files: 11
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numbernone
Joined: Aug 16, 2006 Posts: 477 Location: new york city
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Posted: Mon Oct 13, 2008 1:53 pm Post subject:
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Damn they are getting pricey!! I grabbed a pile of them from electronic Surplus 6 months ago for $3.50-$3.95 a piece. This is the ONE time I have gotten in on something good early rather than late.
I will be having the next revision for sure. |
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Tim Servo
Joined: Jul 16, 2006 Posts: 924 Location: Silicon Valley
Audio files: 11
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Posted: Tue Oct 14, 2008 9:05 am Post subject:
AS21C "Super LFO" PCBs available |
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Only two Rev01 boards left (I actually had 13, but they've been going quickly).
Rev02 boards SHOULD be available in 4 - 6 weeks. I'm a little busy getting ready for the AH Nor Cal show on the 25th, but at least I'm just tweaking the board rather than starting from scratch. This was easily the busiest board I've ever done, so it was a bit of a challenge. BTW, if you're in the market for a good FREE PCB layout program, try KiCAD. I've used it for all the Magic Smoke stuff so far, in addition to a couple of contract projects for a friend of mine (non music related).
Thanks to everyone who has purchased boards so far, and a special thanks to Thomas and Scott Stites for helping us create Magic Smoke in the first place.
Tim (getting my soldering iron warmed up) Servo |
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davebr
Joined: Jun 09, 2007 Posts: 198 Location: portland, or
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Posted: Tue Oct 14, 2008 8:29 pm Post subject:
Corrected link for Super LFO Subject description: Corrected link for Super LFO |
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I had modified my website and the link was different from what you published. To make it easy, I just modified my website so that link now functions. Sorry for any confusion. - Dave
As posted in the original message, photos, information, tips, and a front panel design are at:
http://modularsynthesis.com/magicsmoke/as21c-lfo/lfo.htm |
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RF
Joined: Mar 23, 2007 Posts: 1502 Location: Northern Minnesota, USA
Audio files: 28
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Posted: Tue Oct 14, 2008 9:10 pm Post subject:
Re: AS21C "Super LFO" PCBs available |
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Tim Servo wrote: | Only two Rev01 boards left |
Still got one of these Tim?
If so - I'll take it!
bruce |
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Tim Servo
Joined: Jul 16, 2006 Posts: 924 Location: Silicon Valley
Audio files: 11
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Posted: Tue Oct 14, 2008 10:35 pm Post subject:
AS21C "Super LFO" PCBs available |
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Hey Bruce,
Yes, we still have just two Rev01 boards left. They went pretty quick
If you want one, PayPal funds to magsmoke@gmail.com and you'll be set.
Hey Dave,
Thanks for tweaking the link / site.
Tim (shipping a bunch of boards this weekend) Servo |
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RF
Joined: Mar 23, 2007 Posts: 1502 Location: Northern Minnesota, USA
Audio files: 28
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Posted: Wed Oct 15, 2008 5:12 am Post subject:
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Thanks -
Payment sent!
bruce |
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davebr
Joined: Jun 09, 2007 Posts: 198 Location: portland, or
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Posted: Wed Oct 15, 2008 9:27 pm Post subject:
Modifications to Rev1 PCB Subject description: Description of required and optional modifications |
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I went ahead and documented my PCB images indicating the various required and optional modifications for the Rev1 boards. I put them on a separate page with a link from the main LFO page.
There are two required modifications consisting of three runs to cut and jumper.
I listed 6 optional modifications that are various enhancements and I also listed a hint on calibration.
The link is http://modularsynthesis.com/magicsmoke/as21c-lfo/lfo_mods.htm
Dave |
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RF
Joined: Mar 23, 2007 Posts: 1502 Location: Northern Minnesota, USA
Audio files: 28
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Posted: Thu Oct 16, 2008 6:08 am Post subject:
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Nice job of documenting those davebr - Thanx
bruce |
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fluxmonkey
Joined: Jun 24, 2005 Posts: 708 Location: cleve
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Posted: Thu Oct 16, 2008 7:54 am Post subject:
Re: Modifications to Rev1 PCB Subject description: Description of required and optional modifications |
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davebr wrote: | I went ahead and documented my PCB images indicating the various required and optional modifications for the Rev1 boards. I put them on a separate page with a link from the main LFO page.
There are two required modifications consisting of three runs to cut and jumper.
I listed 6 optional modifications that are various enhancements and I also listed a hint on calibration.
The link is http://modularsynthesis.com/magicsmoke/as21c-lfo/lfo_mods.htm
Dave |
i wish my kludges looked as tidy as yours... nice work. _________________ www.fluxmonkey.com |
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Danno Gee Ray
Joined: Sep 25, 2005 Posts: 1351 Location: Telford, PA USA
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Posted: Mon Nov 10, 2008 4:27 pm Post subject:
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Tim,
Got my board today. Thank you very much. |
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etaoin
Joined: Jun 30, 2005 Posts: 761 Location: Utrecht, NL
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Posted: Tue Nov 11, 2008 5:45 am Post subject:
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"Illudium PU-32 space modulator"?
My board is in as well... _________________ http://www.casia.org/modular/ |
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Tim Servo
Joined: Jul 16, 2006 Posts: 924 Location: Silicon Valley
Audio files: 11
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fluxmonkey
Joined: Jun 24, 2005 Posts: 708 Location: cleve
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Posted: Tue Nov 11, 2008 2:47 pm Post subject:
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Etaoin wrote: | "Illudium PU-32 space modulator"? |
if i had one of those, i'd crank the think wide open so there'd be enuf space in the workshop for all these projects....
b _________________ www.fluxmonkey.com |
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Tallhobbit
Joined: Aug 10, 2007 Posts: 15 Location: Kirkland, WA USA
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Posted: Tue Feb 03, 2009 8:30 pm Post subject:
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OK, since I managed to score the last Rev 01 board from Tim, I was wondering if anyone had a preference of the EXAR chip vs the Intersil chip. For this application I don't think that there would be much difference. The reason that I ask is because I was thinking of building an 8038 based VCO from TH's VCO Chip Cookbook as well. I've read that the EXAR chip is "slightly improved" over the Intersil part and was wondering if anyone had an opinion on this or if the improvements were small enough to make little or no detectable difference at audio frequencies. Your thoughts please?
James |
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fluxmonkey
Joined: Jun 24, 2005 Posts: 708 Location: cleve
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Posted: Thu Feb 12, 2009 12:07 pm Post subject:
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any update on release of rev 2 boards?
b _________________ www.fluxmonkey.com |
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Tim Servo
Joined: Jul 16, 2006 Posts: 924 Location: Silicon Valley
Audio files: 11
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Posted: Sun May 03, 2009 12:56 am Post subject:
AS21C "Super LFO" PCBs available |
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Just a quick note: I've FINALLY finished the Rev02 update / re-spin of the AS21C LFO (also known as the TH-301 "Cucamonga"). I've added the tweaks suggested by Dave Brown, and the boards have been ordered. They should be here in a week or so, and then I'll slap one together to make sure they behave. Thanks for the patience of everyone who has asked about the update to these boards - we should be up and running on these VERY soon.
Tim (then I'm off to the NEXT project) Servo |
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CJ Miller
Joined: Jan 07, 2007 Posts: 368 Location: 127.0.0.1
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Posted: Sun May 17, 2009 2:49 pm Post subject:
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Ooh, I missed Rev1 when I was away over the wintertime. I am definately down for a few of these, and will check back to see when they are ready. I saw the PCB pics on Dave's site, they are gorgeous. I can hardly wait, but it gives me something to look forward to while I am cleaning the toilet! |
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Tim Servo
Joined: Jul 16, 2006 Posts: 924 Location: Silicon Valley
Audio files: 11
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Krelnarb
Joined: Dec 04, 2007 Posts: 23 Location: Richmond, CA
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Posted: Tue Jun 02, 2009 11:50 am Post subject:
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Quote: | trying to think of a city to name the next project after |
May I suggest El Cerrito, located in the SF Bay Area. |
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johans121
Joined: Jun 19, 2007 Posts: 178 Location: Huntsville, AL (USA)
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Posted: Tue Jun 02, 2009 1:23 pm Post subject:
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Krelnarb wrote: | Quote: | trying to think of a city to name the next project after |
May I suggest El Cerrito, located in the SF Bay Area. |
I think Memphis deserves a board named after it.....
But I've digressed.
I am supercalifragelous expialadocous-ly excited about these LFO's. I'm ordering 5 of them! _________________ Don't feed me Indian, you WILL regret it!
-Jim |
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Junk Rhythm
Joined: Jan 07, 2008 Posts: 81 Location: San Francisco, CA
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