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panda30y
Joined: Apr 12, 2009
Posts: 17
Location: Detroit, Michigan
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 Posted: Sun Jul 05, 2009 8:14 pm Post subject:
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| stevenclements wrote: | | panda30y wrote: | | sduck wrote: | | panda30y wrote: | | I I noticed that Thomas' bom from mouser has specified 4 vishay precision pots for the mixing sections. Are precision pots specified for a reason? Otherwise I will buy cheaper pots. Thanks. |
No, you can use just about anything. Those spectrols were expensive when they were $ each, now at 12+$ each they're ridiculous. Alphas will work fine. |
Thanks! That's what I was thinking about doing. |
Can you give us a Mouser Part # for what you're going to swap in place?
cheers
Steve |
I don't know what type of pot you want to use or what's best for your design, so it's hard for me to recommend mine. If you plan on using board mounted pots or panel mounted. I'm planning to use the alpha pots, most likely the 12mm pot with solder lugs since I'm building it for Frac format with a design inspired by the blacet binary zone. I need a pot that small to fit it on my panel and to be able to mount it in my rack. You might have more room and you might be able to use a larger pot.
Regardless just find an Alpha pot in my link that would suit you with a resistance value of 100Kohm and not indented.
http://www.mouser.com/catalog/catalogusd/638/683.pdf
You should be able to find one that suits you on that page or the next.
I would imagine that this should work for you if you want a solder lug terminal:
313-1000F-100K
but I myself will probably be using a smaller design that costs a little more just so I can fit it properly behind my face plate:
313-1210F-100K
The first I listed has a power rating of 1/8 watt and the one I intend to use is 1/12 watt. What I'm still unsure of is what is the recommended power rating for these pots? I'm sure the 1/8 watt would be fine, but my smaller pot that has a 1/12 watt power rating worries me. Can anyone answer this?[/url] |
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ericcoleridge
Joined: Jan 16, 2007
Posts: 889
Location: NYC
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| Posted: Sun Jul 05, 2009 9:56 pm Post subject:
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There was a discussion on the SDIY mailing list recently about the pots ( )Buchla used and their occassional 'shaping resistors'. I don't know if it's ok to quote directly here, but the content is easy enough to find using the searchable archive. Apparently, Buchla CV offset controls are always linear-- which isn't unusual I guess-- but they're often augmented by panel mount resistors, which I don't think are (always/ever) represented in the schematics.
Anyway, it got me wondering if an improved pot response on the LPG might be acheived by replicating the panel mount resistors used in the original module.
I haven't tested one of the TW ResLPG PCBs yet, but on my fonik LPGs, for instance, I found the offset pot needed to be relatively high in order to squeeze out any signal. I don't remember if I was used a Log or Lin pot.
Perhaps this response is both normal and true to the original, and perhaps the original pot shaping resistors are somehow accounted for in the various diy lpg designs-- although I don't immediately see so based on the schematics.
Picture of the 292 panel wiring, I can't really make out the res values:
http://www.synthtech.com/pix/buchla/b292/b292b_4.jpg |
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stevenclements
Joined: Nov 16, 2005
Posts: 74
Location: Edmonton, Alberta
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| Posted: Mon Jul 06, 2009 9:13 am Post subject:
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| panda30y wrote: | | stevenclements wrote: | | panda30y wrote: | | sduck wrote: | | panda30y wrote: | | I I noticed that Thomas' bom from mouser has specified 4 vishay precision pots for the mixing sections. Are precision pots specified for a reason? Otherwise I will buy cheaper pots. Thanks. |
No, you can use just about anything. Those spectrols were expensive when they were $ each, now at 12+$ each they're ridiculous. Alphas will work fine. |
Thanks! That's what I was thinking about doing. |
Can you give us a Mouser Part # for what you're going to swap in place?
cheers
Steve |
I don't know what type of pot you want to use or what's best for your design, so it's hard for me to recommend mine. If you plan on using board mounted pots or panel mounted. I'm planning to use the alpha pots, most likely the 12mm pot with solder lugs since I'm building it for Frac format with a design inspired by the blacet binary zone. I need a pot that small to fit it on my panel and to be able to mount it in my rack. You might have more room and you might be able to use a larger pot.
Regardless just find an Alpha pot in my link that would suit you with a resistance value of 100Kohm and not indented.
http://www.mouser.com/catalog/catalogusd/638/683.pdf
You should be able to find one that suits you on that page or the next.
I would imagine that this should work for you if you want a solder lug terminal:
313-1000F-100K
but I myself will probably be using a smaller design that costs a little more just so I can fit it properly behind my face plate:
313-1210F-100K
The first I listed has a power rating of 1/8 watt and the one I intend to use is 1/12 watt. What I'm still unsure of is what is the recommended power rating for these pots? I'm sure the 1/8 watt would be fine, but my smaller pot that has a 1/12 watt power rating worries me. Can anyone answer this?[/url] |
Thanks for the quick reply.... I'm going to build in a MOTM/Synth.com style format... I'll take a peak at what's on some of the commercial modals I have and get an idea from them... I'm just starting the modular DIY addiction 
Steve
_________________
http://soundcloud.com/pilfermusic
http://www.gearjunkies-userstudios.com/studio.php?stid=221
life is a treasure... dig it! |
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loopcycle
Joined: Nov 06, 2006
Posts: 101
Location: California
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| Posted: Mon Jul 06, 2009 3:48 pm Post subject:
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sorry, this answer didnt seem obvious to me:
when S1,S2 and S5,S6 are connected on two poles, is the AMP mode engaged (or is it FILTER)?
EDIT: answer on page 12 from fonik
| Quote: | if you think of the switches toggle position:
switch up would connect S5 to S6 (lowpass),
switch down would connect S1 to S2 and S3 to S4 (gate).
middle position means no connection (both mode).
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Last edited by loopcycle on Fri Jul 10, 2009 11:24 am; edited 1 time in total |
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gwaidan
Joined: Mar 07, 2009
Posts: 53
Location: Sydney, Australia
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| Posted: Mon Jul 06, 2009 6:52 pm Post subject:
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| boards arrived safely in Sydney today, thanks! |
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DGTom
Joined: Dec 08, 2008
Posts: 211
Location: Adelaide
Audio files: 3
G2 patch files: 1
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| Posted: Mon Jul 06, 2009 7:07 pm Post subject:
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 hopefully mine arn't to far from Adelaide then! |
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stevenclements
Joined: Nov 16, 2005
Posts: 74
Location: Edmonton, Alberta
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jmejia
Joined: Mar 12, 2009
Posts: 114
Location: portland
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| Posted: Mon Jul 06, 2009 11:23 pm Post subject:
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I ordered one a few days ago... now I'm actually thinking maybe I should've ordered 2. What's current stock look like? Do you even have enough for the one order I made?  |
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djthomaswhite
Joined: Nov 22, 2007
Posts: 140
Location: Orange, CA
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| Posted: Tue Jul 07, 2009 8:09 am Post subject:
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Hey guys,
Im down to about 25 pcbs left for sale. They're first come first serve so order what you like. If I run out I'll refund via PayPal. I will keep 4 or so for myself to build out.
Shipping for all unshipped orders is in process. I hope to get everything out by the end of this week. Thanks!
Thomas
_________________
Thomas
www.naturalrhythmmusic.com/diy.html |
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jmejia
Joined: Mar 12, 2009
Posts: 114
Location: portland
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| Posted: Tue Jul 07, 2009 8:16 am Post subject:
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| Nice! I just placed an order for a second one. Hopefully you haven't shipped the first one out already! |
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adambee7
Joined: Apr 04, 2009
Posts: 420
Location: united kingdom
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| Posted: Tue Jul 07, 2009 9:23 am Post subject:
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| I haven't recieved mine yet. eeeeek |
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LetterBeacon
Joined: Mar 18, 2008
Posts: 454
Location: London, UK
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| Posted: Tue Jul 07, 2009 2:00 pm Post subject:
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| Really stupid question alert: Is the jack labelled CV(-) the inverted CV out? |
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djthomaswhite
Joined: Nov 22, 2007
Posts: 140
Location: Orange, CA
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| Posted: Tue Jul 07, 2009 5:13 pm Post subject:
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Adambee7...
don't worry! UK had the worst delivery times of all countries due to customs last time around. 1 order took 4 weeks to get through. Strange as some get boards quick and others not so quick even living only 1 town apart. Usps first class mail does not have a specified delivery time but that allowed for free shipping due to a lower cost. There has only been 1 actual order lost in over 250 so hang tight! Boards are surely in the mail and shipped to the marlow bottom location.
Thomas
inverted CV out is simply an inverted version of whatever cv you run into that section. A simple inverter is all for inverting signals if needed
_________________
Thomas
www.naturalrhythmmusic.com/diy.html |
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adambee7
Joined: Apr 04, 2009
Posts: 420
Location: united kingdom
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| Posted: Tue Jul 07, 2009 6:45 pm Post subject:
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| cheers thomas. I had a similar wait last time when I ordered something from Elby in Australia. Our country is slack to say the least. |
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jaidee
Joined: Oct 28, 2007
Posts: 44
Location: Newcastle upon Tyne, UK
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| Posted: Wed Jul 08, 2009 10:49 am Post subject:
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Hi Thomas
Just to confirm that I received my board here in the UK a few days ago.
Thanks for all your time and trouble! |
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billy pilgrim
Joined: Feb 12, 2008
Posts: 36
Location: nyc
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| Posted: Thu Jul 09, 2009 10:01 am Post subject:
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Weird indeed, mine just arrived today, thanks Thomas.
Postage is WEIRD! Almost all domestic boards shipped one one day. The late domestic orders shipped with the international boards 3 days later (last Friday). In batch 1, Euro orders also made it to people before some US ones. If boards are not the in 2 more weeks I'll work something out for each of you. So far only 1 package has come back that I need to send back out from Hanz Muns. They're coming guys! |
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lexvortex
Joined: May 14, 2008
Posts: 155
Location: Toronto
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| Posted: Thu Jul 09, 2009 12:47 pm Post subject:
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Hi Thomas,
I just got my 4 boards here in Canada!
Cheers,
Dave |
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reve
Joined: Feb 23, 2008
Posts: 149
Location: USA
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| Posted: Fri Jul 10, 2009 3:58 pm Post subject:
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| Has anyone tried two different types of (dual) vactrols and a multi-pole switch? Any reason why that wouldn't work due to the length of the wire runs or anything? |
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adambee7
Joined: Apr 04, 2009
Posts: 420
Location: united kingdom
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| Posted: Sat Jul 11, 2009 7:11 am Post subject:
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| I'm a happy man. If I could buy you a drink Thomas I would. My boards arrived today and the stuffing has commenced. Cheers chap. |
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fonik
Joined: Jun 07, 2006
Posts: 3950
Location: Germany
Audio files: 23
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Posted: Sun Jul 12, 2009 6:35 am Post subject:
Subject description: EXPANSION BOARD? |
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| loopcycle wrote: | sorry, this answer didnt seem obvious to me:
when S1,S2 and S5,S6 are connected on two poles, is the AMP mode engaged (or is it FILTER)?
EDIT: answer on page 12 from fonik
| Quote: | if you think of the switches toggle position:
switch up would connect S5 to S6 (lowpass),
switch down would connect S1 to S2 and S3 to S4 (gate).
middle position means no connection (both mode).
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since i have had no version with resonance, i eventually built one of thomas PCBs myself yesterday. worked from 1st power up, sounds great. thank you, thomas. (BTW all pads had become white, but that did nothing to the soldering)
but that's not all.
i became more interested in logic/control lately, so i am currently working on an expansion PCB for thomas LPG PCB. it will interconnect with his board via the switch mode connector. it will allow gate controlled mode selection (which can be overwritten by manual setting). to enable the 'both'-mode one would need two gates though.
i am thinking of
Lo/Lo = gate
Lo/Hi = lopass
Hi/Lo = both
Hi/Hi = both
i lined it out on paper already and will breadboard and test it this week. i will keep you posted, and could do a PCB run if there is enough interest.
_________________
cheers,
matthias
____________
Big Boss at fonitronik
Tech Buddy at Random*Source |
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adambee7
Joined: Apr 04, 2009
Posts: 420
Location: united kingdom
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| Posted: Sun Jul 12, 2009 9:30 am Post subject:
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| That sounds great Fonik. I'm up for one. |
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ericcoleridge
Joined: Jan 16, 2007
Posts: 889
Location: NYC
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| Posted: Sun Jul 12, 2009 12:34 pm Post subject:
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| I'd be up for some of these also. Perhaps 2 or 4 of these circuits could fit into the TW LPG PCB footprint? |
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numbertalk
Joined: May 05, 2008
Posts: 992
Location: Austin, TX
Audio files: 5
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| Posted: Sun Jul 12, 2009 1:14 pm Post subject:
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| Definitely interested! |
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bf
Joined: Feb 28, 2009
Posts: 22
Location: mid-west
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| Posted: Sun Jul 12, 2009 1:31 pm Post subject:
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| interested as well |
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djthomaswhite
Joined: Nov 22, 2007
Posts: 140
Location: Orange, CA
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