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Scirocco
Joined: Dec 11, 2005 Posts: 22 Location: Barcelona/Catalunya
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Posted: Sun Jan 22, 2006 10:13 am Post subject:
Theremin PCB Layouts, schematics.... |
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I´ve decided to build my own theremin.I´m thinking about a Theremax or Etherwave type theremins or something similar.
I´ve been sending mails several times to Paia asking for some payment details for his kit with no response (some friends have been doing too with the same success).
I´ve downloaded the Paia manual and schematics but I found PCB layout a litle unclear for me
Anybody knows a cool source for Theremin PCB layouts,info ,etc etc ?
Thank you very much _________________ Have a nice day
http://www.flickr.com/photos/monocapa/ |
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deknow
Joined: Sep 15, 2004 Posts: 1307 Location: Leominster, MA (USA)
G2 patch files: 15
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Posted: Sun Jan 22, 2006 3:16 pm Post subject:
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paia is likely going through a transition, as john was killed a motorcycle accident a few months ago.
i think they are a fantastic company which fills the gaps between the expensive stuff (motm and the like) and the informally supported stuff (like soundlab), and are worth supporting for what they do. i would try another email, or perhaps even a phone call.
i've built the tmax, and it's a great kit.
deknow |
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elektro80
Site Admin
Joined: Mar 25, 2003 Posts: 21959 Location: Norway
Audio files: 14
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Posted: Mon Jan 23, 2006 12:35 am Post subject:
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The Theremax is an excellent kit. I am all in favour of supporting Paia. _________________ A Charity Pantomime in aid of Paranoid Schizophrenics descended into chaos yesterday when someone shouted, "He's behind you!"
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Scirocco
Joined: Dec 11, 2005 Posts: 22 Location: Barcelona/Catalunya
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Posted: Mon Jan 23, 2006 12:04 pm Post subject:
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Thanks for your opinion ,I´ve sent another mail to PAIA to see what happens.I totally agree with PAIA´s philosophy and I think that they´ve been doing fine all this years...but I hope to recieve any response...
By the way, one of the things that are unclear for me is which kit I have to pick if I want to manage myself to make a nice box, in the site appears 3 kits... 1-circuit and components 2- wooden case kit and 3 - hardware.
in the 1 kit description appears a "less case" .. Does it means that this kit are including antenae and front pannel etc etc?.
I though that If you want to make your own case you must purchase kit 1 and 3 but not sure... anybody knows it ?
Thank you very much again for your opinion _________________ Have a nice day
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Scirocco
Joined: Dec 11, 2005 Posts: 22 Location: Barcelona/Catalunya
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Posted: Mon Jan 23, 2006 1:53 pm Post subject:
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I´ve just received answer from PAIA
All doubts clear , I think I´m gonna order one just now !! _________________ Have a nice day
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deknow
Joined: Sep 15, 2004 Posts: 1307 Location: Leominster, MA (USA)
G2 patch files: 15
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Posted: Mon Jan 23, 2006 2:37 pm Post subject:
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great! i'm glad to hear that paia has responded. my first kit was the tmax, and i've also built the fatman, the vocoder, and several of craig andertons "electronic projects for musicians" kits. the vocoder would be a lot more useful with some mods, but everything else is really usable, and really cheap for what you get (that anderton "super tone control" is really nice sounding).
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krkr
Joined: Jul 25, 2005 Posts: 37 Location: Morrisville PA
Audio files: 6
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Scirocco
Joined: Dec 11, 2005 Posts: 22 Location: Barcelona/Catalunya
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Posted: Thu Feb 16, 2006 7:47 pm Post subject:
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Thanks,absolutely nice links and some unknown for me ,thank you.
My Theremax has arrived and I´ve built it.
I´m sad to say that It doesn´t work properly.. . Let me expalin:
The picht section works really fine, nice sound, well adjusted range, timbre ,controls etc etc..
The trouble is at the volume section...
No reasonable response from the volume antenna.It only worls ,when I make an incorrect adjust of the L1 and L4 coils ,then appears some kind of another pitch line sounding not as louder as natural timbre sound and making strange-radio-tuning sounds...
Following step-by-step the manual, first I adjust the L1 and L4 coils and then the L2 to set the pitch range, and (whith L1,L2,L4 ok) when I´m gonna adjust the volume control range I notice no response from the L3 coil...
My multimeter says that the 4 oscilators are taking a good meal (8.2 V).Testing the pitch control voltage line
at the circuit I see a variation using the antenna but volume control voltage is stucked at 5,6V...
The NPN trannies seem to be good ,and I think that L3 could be the trouble...
I think I´ll have enough time this weekend to make it all clear and I´ll send this questions to paia, but I´m posting this here too know if anyone could have a quick response or suggestion and if it could be a common trouble etc etc...
I think that´s all for the moment ,thank you very much for reading it and sorry for my low level language _________________ Have a nice day
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krkr
Joined: Jul 25, 2005 Posts: 37 Location: Morrisville PA
Audio files: 6
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Posted: Fri Feb 17, 2006 6:38 am Post subject:
YOUR THEREMAX Subject description: What Might Be Wrong |
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Hi:
Sounds like you're encountering almost the same problem I had when I finished. My volume did work, but it was weak -- I could tell I wasn't getting the full effect.
Calling the tech guys at PAIA is a good idea -- I did, and they offered me an explanation that turned out to be IT:
The problem turned out to be a miniscule spatter of solder that adhered to one of the copper "pathways" (sorry, I don't know the correct technical term) on the circuit board. It took ages to find it going over everything with a magnifying glass, but once the little speck was removed, I had full power and response. |
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Scirocco
Joined: Dec 11, 2005 Posts: 22 Location: Barcelona/Catalunya
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Posted: Fri Feb 17, 2006 11:05 am Post subject:
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I´m going on , testing my ill Theremax and I´ve notice this:
All Q´s voltages seem to be correct, like troubleshooting tells, but .... whem I´m testing voltage on Pin 1 of the Lm339 only gives me a correct lecture the first 4 or 5 sec after power on the unit, then I can hear a very little "pop" and the voltage falls from about 8V to 0.....
Then, looking at my poor LM I can see that his surface is suspiciously obscured.....and the theremax sound are practically the same with or without this LM comparator...
It seems that the trouble is located at the VCA ( )
Now I´m gonna rush to the parts shop to pick some LM´s to see what happens..
Call Paia guys is a nice idea but I´m located in Spain and my English skills is quite poor to have a non-surrealistic conversation... but I´ll have to do it if it is necessary.
The miniscule spatter of solder on a cooper track making a shortcut theory seems to be more present while I´m testing the unit but taking a look at the pcb, soldering points seems to be really correct and this solder spatters are really small and I can´t see any shortcut at this time...
That´s all at the moment and really thanks again _________________ Have a nice day
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Scirocco
Joined: Dec 11, 2005 Posts: 22 Location: Barcelona/Catalunya
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Posted: Mon Feb 20, 2006 1:16 pm Post subject:
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Theremin working fine now ....Last night Mr Q6 was declared guilty.... and of course condemned ....
Thanks to all _________________ Have a nice day
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Sintetizadorman
Joined: Dec 28, 2006 Posts: 2 Location: Mexico
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Posted: Thu Dec 28, 2006 10:28 am Post subject:
Off topic just a little Subject description: Vocoder |
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Hey Im sorry for asking this, but here in Mexico I cant find any vocoder machine, I have been looking for it like one year, Im tired and I want to build my own voco, do you know about any web site were I can find the schematic of any conventional vocoder? |
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Scirocco
Joined: Dec 11, 2005 Posts: 22 Location: Barcelona/Catalunya
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Sintetizadorman
Joined: Dec 28, 2006 Posts: 2 Location: Mexico
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Posted: Fri Dec 29, 2006 11:04 pm Post subject:
Thanks |
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Hey thank you but that is not an schematic, they just tell me how the vocoder works but they dont have anything that tells you where the resistors or caps go, obviously they wont do it... there must be another way, hey please Im also looking for DPDT switches, tried to buy via eBay but the boy did not send me anything, any idea? THANK YOU = ) |
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