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 Forum index » DIY Hardware and Software » Thomas Henry designs
An Analog Synthesizer for the 21st Century
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Thomas Henry



Joined: Mar 25, 2007
Posts: 298
Location: Southern Minnesota
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PostPosted: Wed Sep 05, 2007 7:39 am    Post subject: Re: 8038 LFO Reply with quote  Mark this post and the followings unread

THeff wrote:

I really didn't think about it being desirable to have it swing to the rails, but I see what you mean, I will leave the Coarse control the way it is.


No, it's not desirable. And that's the point of have the large range; you can always adjust the pot to keep away from swinging to the top or bottom.

Thomas Henry
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v-un-v
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PostPosted: Wed Sep 05, 2007 2:27 pm    Post subject: Reply with quote  Mark this post and the followings unread

Scott Stites wrote:

I never did a press'n'peel of the XR-VCO (or any circuit for that matter). There's a layout Thomas did for it on my site, and another one Tom Bugs did on the Bugbrand site.


No- I know you didn't! Laughing
I was suggesting doing a press n peel from the layout on your site.

I'm a big fan of LFO's too- I agree with Chris Carter (SOS, TG etc)- "you can't have to many of them". A PCB of the LFO?? Sure thing! Very Happy

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Blue Hell
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PostPosted: Wed Sep 05, 2007 3:39 pm    Post subject: Reply with quote  Mark this post and the followings unread

Chris Carter (SOS, TG etc) wrote:
"you can't have to many of them"


Yes, it's the development of a sound that makes it interesting.

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also .. could someone please turn down the thermostat a bit.
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fonik



Joined: Jun 07, 2006
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PostPosted: Wed Sep 05, 2007 11:22 pm    Post subject: Reply with quote  Mark this post and the followings unread

Keysandslots wrote:
I paid for the download version but didn't get to do the download. I'm at work and used my home email address, I'm hoping they've sent me a link.

Randy

you don't need a link. just login to your account and browse to your download section (lower left). klick on the item to download...

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cheers,
matthias
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Keysandslots



Joined: Aug 18, 2006
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PostPosted: Thu Sep 06, 2007 9:34 am    Post subject: Reply with quote  Mark this post and the followings unread

Thanks. The email message was waiting for me when I got home, no problems after that. I am clueless when it comes to this DIY stuff but I figured this book was too good an investment to pass up. Maybe someday I'll be able to afford either the time to figure it out myself or the money to hire someone to build it.

Randy
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StephenGiles



Joined: Apr 17, 2006
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PostPosted: Sat Sep 08, 2007 12:30 pm    Post subject: Reply with quote  Mark this post and the followings unread

Thomas, we are currently on holiday in Spain on the Costa Blanca. I read the book yesterday morning whilst my wife did her daily sun bathing - absolutely superb stuff! It's great to be in proper summer weather - currently 30C after our terrible summer in the UK.
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THeff



Joined: Sep 01, 2006
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PostPosted: Sun Sep 16, 2007 2:13 pm    Post subject: Thomas Henry Stuff! Reply with quote  Mark this post and the followings unread

All,

Here are some recent additions to my synth from the Thomas Henry family. They are very well behaved and get along well with the other modules. Laughing

THANKS THOMAS! Very Happy Very Happy Very Happy

Regards,

Tim

Last edited by THeff on Sun Dec 02, 2007 6:47 pm; edited 1 time in total
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Thomas Henry



Joined: Mar 25, 2007
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PostPosted: Sun Sep 16, 2007 10:45 pm    Post subject: Reply with quote  Mark this post and the followings unread

Hi all,

StephenGiles wrote:
Thomas, we are currently on holiday in Spain on the Costa Blanca. I read the book yesterday morning whilst my wife did her daily sun bathing - absolutely superb stuff! It's great to be in proper summer weather - currently 30C after our terrible summer in the UK.


Many thanks for your kind comments. I think I'd rather be on the beach watching the sunbathers, but I can completely understand the allure of a shapely schematic in lieu. As for summers, well, what can I say.? Our president tells us that global warming is a fiction created only by bad science, and he ought to know!

Thomas Henry
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Thomas Henry



Joined: Mar 25, 2007
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PostPosted: Sun Sep 16, 2007 10:49 pm    Post subject: Re: Thomas Henry Stuff! Reply with quote  Mark this post and the followings unread

Hi again,

THeff wrote:

Here are some recent additions to my synth from the Thomas Henry family. They are very well behaved and get along well with the other modules. Laughing


Absolutely beautiful work! I think you may be among the first to have built some of these guys, after Scott and me. Tell us, what do you think of the noise generator and the mega-LFO?

Good job! I love seeing what you guys are doing with these designs. (It's great not having to depend on doing this stuff to make house payments anymore.)

Thomas Henry
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THeff



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PostPosted: Mon Sep 17, 2007 9:37 am    Post subject:  Two Cool modules that are just too cool!!! Reply with quote  Mark this post and the followings unread

Quote:
Tell us, what do you think of the noise generator and the mega-LFO?


Hi Thomas,

Thanks for the compliments. I am very excited about the mega-LFO and noise generator. The perfboard that I built the LFO on started out to be the 76477 super controller but I actually removed the 76477 and rebuilt it as the Mega-LFO. The 8038 design has every base covered and I love the range with one sweep!

The VC noise generator is great also. I perfboarded the Ken Stone design several years ago and always liked it. Your new design with the longer shift sequence and smooth CV control is really nice.

Man, with the Mega-LFO and VC Noise together it makes a "Swiss Army Knife" of synthesizer controllers. I built a clone of the Roland M-182 sequencer clock to control my Klee sequencer, but I think your Mega-LFO would have served the purpose just as well.

I hope with all the interest in your old books, new books, and cool designs that you will keep them coming! Laughing

Regards,

Tim
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philpeery



Joined: Nov 08, 2006
Posts: 137
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PostPosted: Mon Sep 17, 2007 9:59 am    Post subject: AS21C lfo and vca Reply with quote  Mark this post and the followings unread

Hi all,

Great stuff Tim! Glad to see some of these circuits get put behind panels! Nice job!

I have been trying to get a single sided pcb design done for both the lfo and a dual vca from the AS21C book. Has anyone made any progress on this? I plan on sharing my designs, but it might be a while. Too many projects, not enough time...!

Regards,
Phil
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numbernone



Joined: Aug 16, 2006
Posts: 477
Location: new york city

PostPosted: Mon Sep 17, 2007 11:18 am    Post subject: Reply with quote  Mark this post and the followings unread

I have a few layouts done from the book. I am not a self etch type, so I have thus far used Express PCB, its the only small run service I have found for my personal stuff. The only catch is the predetermined and small board size (3.8" x 2.5"), which has made it very fun trying to cram it all on there! I usually end up with lots of vertical resistors and ugly stuff like that. I need to fine tooth them one last time before ordering, but I have finished the LM 13700 VCO. The ADSR is so compact I have managed to fit 3 of them on a single tiny board, this is very exciting as i want TONS of EGs. I did a take on Tom Bugs XR layout some months ago, this is a killer VCO! The LFO will be next, but it is certainly intimidating. Then the VC noise, and then...

I will gladly share any of my layouts once they are tested, the big caveat being that these are bare bones boards, no silkscreen, soldermask etc. And all of my part placement/wiring is done with a pencil on old fashioned paper Embarassed Im sure Magic Smoke will come thru with the goods for lots of these, but that will require time, and most of us want it NOW.

I love laying out PCBs, its like creating and solving a maze puzzle all at the same time.
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23isgood



Joined: Nov 18, 2006
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PostPosted: Mon Sep 17, 2007 12:55 pm    Post subject: Reply with quote  Mark this post and the followings unread

Very nice job Tim! Man you are on fire building all these SDIY projects. I was impressed enough with your Klee. Once every year, I go through a building frenzy, and build a bunch of stuff. I build three TH XRVCO's like this. This year I built a drum box. You can see it in the AH bay area pics.

pete

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THeff



Joined: Sep 01, 2006
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PostPosted: Mon Sep 17, 2007 4:41 pm    Post subject: Reply with quote  Mark this post and the followings unread

Thanks Phil, numberone, and Pete.

Building stuff on perfboard works well for me if I am only building one of something. It allows me to test new circuits quickly and make changes if necessary. I have also made lots of PCBs over the years using internet and magazine art work, and Eagle CAD for my own designs. I think you can't beat the prices for PCB supplies from Circuit Specialists.

Pete, you are right I have been on quite a SDIY building spree this year. I find that building stuff like this is a great escape for me and provides a lot of satisfaction that I am doing something useful with my time. My biggest problem right now is that my synth cabinet is full. I really need to add another tier to the top. I am embarrassed to tell you how big it already is. I will just say that I wouldn't want it to fall on me! Laughing

Regards,

Tim
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philpeery



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PostPosted: Mon Sep 17, 2007 4:52 pm    Post subject: hmmm jpeg's.... Reply with quote  Mark this post and the followings unread

Tim,

Pics! We must ave pics! Of the whole she-bang!

Phil
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THeff



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PostPosted: Mon Sep 17, 2007 8:03 pm    Post subject:  Stuff to scare your neighbors with... Reply with quote  Mark this post and the followings unread

OK Phil, You asked for it!

Actually I needed an excuse to take some recent photos of my setup, so I took these tonight. The synth case is made from artifical woodgrain shelving boards as suggested on the Synth Dot Com web sight. The horizontal boards are 48", so you can see why I wouldn't want it to fall on me. Shocked

Regards,

Tim

Last edited by THeff on Wed Sep 19, 2007 2:54 pm; edited 1 time in total
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Adam-V



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PostPosted: Mon Sep 17, 2007 10:34 pm    Post subject: Reply with quote  Mark this post and the followings unread

That's a really sweet set-up Tim.

Cheers,
Adam-V
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philpeery



Joined: Nov 08, 2006
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PostPosted: Mon Sep 17, 2007 10:55 pm    Post subject: Reply with quote  Mark this post and the followings unread

Tim,

Thanks for posting the pics! I really like the midibox stuff, and the modular gear, well I can only say I am envious! You have more modules in your group waiting to go into a cabinet than I have in my entire synth! It would be cool to hear some music from this! I'm going to have to do a LOT of soldering to catch up!

Thanks again!
Phil
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THeff



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PostPosted: Tue Sep 18, 2007 6:20 pm    Post subject: Reply with quote  Mark this post and the followings unread

Thanks Adam & Phil,

I have been working with electronic music on and off for a number years. Recently though I have really made an effort to put together a lot of the missing pieces that I was curious about. I now want to concentrate more on the music part and less on the building. The Klee sequencer has really opened a new door to creativity...thanks to Scott Stites. The TH books have come along at a perfect time as well to provide some sophisticated designs that are still beautifully simple. SDIY is great!

Tim
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Adam-V



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PostPosted: Tue Sep 18, 2007 8:33 pm    Post subject: Reply with quote  Mark this post and the followings unread

THeff wrote:
I now want to concentrate more on the music part and less on the building.


Yep, It's all too easy to spend more time acquiring and/or making equipment than actually using it. I've fallen victim to that one over the years too.

Cheers,
Adam-V
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Tim Servo



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PostPosted: Thu Sep 20, 2007 5:28 pm    Post subject: An Analog Synthesizer for the 21st Century
Subject description: LM VCO Stability
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Hi Guys and Gals,

Someone has asked me what the stability and tracking of the LM VCO is like. Anyone here have some experience with that VCO? I would assume that the short-term stability would be pretty good (especially if built with a tempco), but I don't have any first hand experience with the LM.


Tim (are you experienced?) Servo
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Scott Stites
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PostPosted: Wed Sep 26, 2007 2:53 pm    Post subject: Reply with quote  Mark this post and the followings unread

Dang, Tim (THeff that is) you are on fire. I've never seen anybody crank out the perfboard that you can. I'm perpetually amazed at that.

And not that Tim Servo isn't on fire either, he's smokin', man, smokin' Very Happy

I had the LMVCO on breadboard last summer, and, I gotta tell you it was quite stable even on breadboard. It's really a sweet VCO, and one that didn't get enough time before the BB real estate agent showed up to reposses the space.

I'll be returning to it.....

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flight



Joined: Sep 26, 2007
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PostPosted: Wed Sep 26, 2007 6:35 pm    Post subject: Thanks but... Reply with quote  Mark this post and the followings unread

I just downloaded the book and am quite impressed. The title, however, is a bit misleading. I was hoping that one of the design points in this book would be to use available ICs, instead of relying on long-obsolete components.

Please don't get me wrong, I am deeply appreciative for Thomas Henry and all he has done, yet many newcomers (like myself) are being discouraged by the lack of specialized components that are either completely evaporating or rapidly accelerating in cost.

~flight
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fluxmonkey



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PostPosted: Wed Sep 26, 2007 7:30 pm    Post subject: Re: Thanks but... Reply with quote  Mark this post and the followings unread

flight wrote:
I just downloaded the book and am quite impressed. The title, however, is a bit misleading. I was hoping that one of the design points in this book would be to use available ICs, instead of relying on long-obsolete components.

Please don't get me wrong, I am deeply appreciative for Thomas Henry and all he has done, yet many newcomers (like myself) are being discouraged by the lack of specialized components that are either completely evaporating or rapidly accelerating in cost.

~flight


well, that's always been an uphill battle for electronics hobbiests, and will continue to be. someday (sooner than you think) thru-hole parts will be as hard to come by as tubes. some of tom's previous books have relied a lot on chips that are now difficult-but-not-impossible to get (he really liked his 566s, f'rinstance), but less so in this book.

feel free to ask about specific components that you're having trouble finding... i'm pretty sure all the listed ICs are currently available from multiple suppliers.

bbob
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Scott Stites
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PostPosted: Wed Sep 26, 2007 7:31 pm    Post subject: Reply with quote  Mark this post and the followings unread

welcome flight.

The only IC I know of that has been discontinued would be the CA3080 in the Mega LFO (and it was still in production when Thomas designed that one just a couple of years ago). Even that one can be easily obtained, especially here in the States. If you'd like, I could name you any number of run-of-the-mill supply houses here that could provide you each and every part in that synth.

What parts strike you as being long obsolete?

Cheers,
Scott

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