electro-music.com   Dedicated to experimental electro-acoustic
and electronic music
 
    Front Page  |  Articles  |  Radio
 |  Media  |  Forum  |  Wiki  |  Links  |  Store
Forum with support of Syndicator RSS
 FAQFAQ   CalendarCalendar   SearchSearch   MemberlistMemberlist   UsergroupsUsergroups   LinksLinks
 RegisterRegister   ProfileProfile   Log in to check your private messagesLog in to check your private messages   Log inLog in  Chat RoomChat Room 
 Forum index » DIY Hardware and Software
Frac rack Banana Jack...some spec guidlines
Post new topic   Reply to topic Moderators: jksuperstar, Scott Stites, Uncle Krunkus
Page 1 of 2 [35 Posts]
View unread posts
View new posts in the last week
Mark the topic unread :: View previous topic :: View next topic
Goto page: 1, 2 Next
Author Message
peng



Joined: Feb 23, 2006
Posts: 109
Location: Chicago
Audio files: 2

PostPosted: Mon Mar 09, 2009 11:27 pm    Post subject: Frac rack Banana Jack...some spec guidlines Reply with quote  Mark this post and the followings unread

Let me start by stating who I am.

I am MegaOhm Audio and run these two websites:

www.megaohmaudio.com
www.fracanana.com

There's nothing on the fracanana site yet.

So, I started out doing small module runs a few years ago in MOTM format. This led to some custom modules done in Modcan A format. I fell in love with bananas!

Last Nov I made a pcb for a Delta VCF and did a batch of five MOTM format and a few Modcan A format. It turns out this was a no-no. One said No outright and the other gave me the impression that permission may be conditional. No problem. To each his own.

So I have abandoned both formats. If it's not FULLY open then I'm not interested.

For 1/4" format I have settled on Moog/Synthesizers.com format. There are many benefits to this form factor but that's for another post.

For banana jack format I settled on Frac Rack. Racks ard power supply are easy to get and are priced reasonably. Also, the smaller form lends itself to live rigs which is very much an interest of mine.

While waiting for my panels to arrive, I saw that BugBrand put out a line of cool modules in banana frac format. I was VERY happy. The more people doing this format the better. Also, Metalbox does versions of their CGS modules in banana jack. Very cool.

So, I'm not here to dictate the standards. I'm not that presumptuous. This topic is an effort to establish some rough guidelines for DIYers and/or companies that are interested in this format so that a variety of modules from a variety of places can play together happily.

Jack colors.
I think one of our members, Neandrewthal, is on the same page here (please chime in).

Green - audio input
Yellow - audio output
Blue - CV input

That's all I have for now. My first module was a Delta VCF and that is all it needed. I went with green for audio input because that seems the standard for old analog computers (and because I really like the color green!). Yellow, for some reason, seemed intuitive. Maybe it is from the Modcan A modules I made? Blue because Serge and Buchla use it and it seems like the standard.

I am a little biased here because I will be using colored knobs. The most populous jacks on most modules will be audio in and CV in. The jacks and knobs that I like the most on a black panel are blue and green. So...there's my logic!

If we can accept the above, then what about the remaining colors and functions?

Red - Logic? Input or output...or both?
Brown - System ground?

Any more functions that need colors? How about CV outputs?


For electrical standards I propose...actually going with the common standards:

audio signals - +/-5V or 10Vp-p

CV signal - 0-5V (for example: an envelope output)

Gate,Trigger, Pulses - I'm going with 0-5V but higher signal here shouldn't matter much. How about threshold voltage? Anything above 1V equals on/high?

Power: +/- 15V

I'm sure I am forgetting some things.

Give your opinions and suggestions. I think this format is really going to take off for a variety of reasons. My thought is it would be best to have some rough standards so that modules from a variety of different sources will patch and play well together. Looking forward to some feedback.

Thanks,
p.


deltafrac.jpg
 Description:
Fracanana / MegaOhm Audio Delta VCF
 Filesize:  229.19 KB
 Viewed:  113 Time(s)
This image has been reduced to fit the page. Click on it to enlarge.

deltafrac.jpg


Back to top
View user's profile Send private message
The Bad Producer



Joined: Mar 08, 2009
Posts: 255
Location: The Manhole

PostPosted: Tue Mar 10, 2009 5:28 am    Post subject: Reply with quote  Mark this post and the followings unread

Hi Peng,

Very interesting, I have started making Banana Frac panels for myself, after starting on bananas with an enormous 16 sequencer project (I was led to bananas by cost, each sequencer had 64 sockets, and I could get non-ROHS bananas from Rapid here in the UK for next to nothing).

I have a Eurorack rig and was tempted to continue in the format but continually failing 3.5mm sockets kind of did my head in, and the cost of the racks is too much, and a bit fiddly somehow DIY fashion.

I have thought about colour coding, and done a bit of research, I found out that there are several Forum members who have also thought about this:

Rykaard:

Audio out = orange
Audio in = purple
CV out = yellow
CV in = blue
Digital / Clock in = black
Digital / Clock out = white
ADSR trig / gate = grey
multiples = green / white

Neandrewthal:

Logic In: Red
Logic Out: Orange
CV In: Blue
CV Out: Pink
Audio In: Green
Audio Out: Yellow

Bugbrand:

· Blue = Control Signal Input
· Red = Control Signal Output
· Yellow = Audio Signal Input
· Green = Audio Signal Output

It seems a good idea to set a rough kind of standard, but AFAIK I would not be able to get my hands on the more esoteric coloured bananas from the UK, Rapid seem to only sell Red, Green, Yellow, Blue, White and Black.

I will also be making lots of effects in Frac format (mainly Haible clones etc) and I'll probably put 1/4" ins and outs on these (alongside the bananas) for ease of patching to my samplers and mixer...


Charlie
Back to top
View user's profile Send private message Visit poster's website
peng



Joined: Feb 23, 2006
Posts: 109
Location: Chicago
Audio files: 2

PostPosted: Tue Mar 10, 2009 7:53 am    Post subject: Reply with quote  Mark this post and the followings unread

Hmm... this might be harder than I thought it would be. I guess bananas lend themselves to a greater variety which is good and bad I suppose.

Everybody has Blue as CV inputs. It seems we came to a consensus naturally for that one.

Upon futher thought, I like red for Logic inputs. Logic being any On/Off or two state signals (i.e.: gate and trigger inputs, Boolean type functions, start stop, etc.)

I have no problem assigning the most populace jacks with the easily available colors that you listed.

What i have in mind so far:

Blue = CV in
???? = CV out
Green = Audio In
Yellow = audio out
Red = trigger/gate/logic,etc. input


I also have another agenda. I am trying to mate colored knobs with the relevant jacks. I don't really like how the grey knobs look, so I'm not looking to use grey jacks (unless it is some function that doesn't require an attenuator).

I don't know where to get pink jacks.
The blue jacks that BugBrand uses look a lot darker than the jacks I have. I like them darker (better matches the knob).

I suppose panel color would make a difference in what jack colors to use. For instance, black jacks on a black panel is not to my taste, but black jacks on a silver panel look great.

It could be that my idea for a standard (even a rough one) is not appealing to all. Hopefully others will jump in and tell us what they like and why.

p.
Back to top
View user's profile Send private message
creatorlars



Joined: Nov 26, 2007
Posts: 524
Location: Denton, TX
Audio files: 4

PostPosted: Tue Mar 10, 2009 8:24 am    Post subject: Reply with quote  Mark this post and the followings unread

This is a great thread -- I am also using banana jacks and matching colored knobs. Generally my standard is...

CV/Audio input = Colored jack w/Colored knob for attenuator
CV/Audio output = Black jack
Any digital/logic input or output = White jack

The "color" varies from module to module, which I preferred to settling on a color standard from the beginning. This way I can color-code types of modules, or use it as a dating system to remember when I made certain modules. I started with yellow, but moved to orange recently. I use input attenuators where ever possible, and they always use colored knobs connected via a line to the appropriate jack (like your panel.) I have used a couple white knobs for threshold-based controls such as trigger sensitivity.

I am very satisfied with this so far, the only thing that bugs me is that the black jacks and black knobs blend against the panel when viewing from afar, so the overall synth doesn't give the striking impression it could. The bad thing is that most of the jacks/knobs on the synth are black, and it would be very expensive to replace them all. If I did, maybe I'd use white knobs/jacks for all outputs, and pick something else for digital signals.

For my panels, I am using MOTM-sized panels. Typically layout is in a 0.875" x 1" grid, same spacing for jacks and knobs. For rack panels, it's a 1" x 0.75" grid, which varies a bit depending on the needs of the module.

For the video synthesizer modules I'm working on, I've decided on using frac panels, still with banana jacks. Since with modules like the color encoder, you have Red, Green and Blue inputs, there is of course no better excuse for using appropriately colored jacks and knobs for these. Smile
Back to top
View user's profile Send private message Visit poster's website AIM Address
fluxmonkey



Joined: Jun 24, 2005
Posts: 696
Location: cleve

PostPosted: Tue Mar 10, 2009 9:18 am    Post subject: Reply with quote  Mark this post and the followings unread

not as a recommendation, but you might also think about Serge:

Red is used for trigger signals
Blue for DC coupled signals
Black for AC coupled signals
Purple is used for sync.

no distinction between in/out, afaik. i think this "standard" is more of a guideline than a Law, and there is variation especially in older panels.


herding cats is a old and noble undertaking... best of luck!

b

_________________
www.fluxmonkey.com
Back to top
View user's profile Send private message
peng



Joined: Feb 23, 2006
Posts: 109
Location: Chicago
Audio files: 2

PostPosted: Tue Mar 10, 2009 9:22 am    Post subject: Reply with quote  Mark this post and the followings unread

bbob wrote:


herding cats is a old and noble undertaking... best of luck!

b


LOL!

Thanks!
Back to top
View user's profile Send private message
peng



Joined: Feb 23, 2006
Posts: 109
Location: Chicago
Audio files: 2

PostPosted: Tue Mar 10, 2009 9:38 am    Post subject: Reply with quote  Mark this post and the followings unread

creatorlars wrote:


The "color" varies from module to module, which I preferred to settling on a color standard from the beginning. This way I can color-code types of modules, or use it as a dating system to remember when I made certain modules. I started with yellow, but moved to orange recently. I use input attenuators where ever possible, and they always use colored knobs connected via a line to the appropriate jack (like your panel.) I have used a couple white knobs for threshold-based controls such as trigger sensitivity.


I can relate to your point of having different colors for different modules. At some point I will be building self contained instruments as opposed to separate modules and probably use a system like: red for VCF controls and jacks, blue for VCO A, Green for VCO B, etc.


A benefit to establishing a common color scheme is really to the end user in putting together modules from various makers and having them all work together intuitively. Another benefit is less reliance on text.
A third plus would be to the manufacturer/builder because we wouldn't need to change colors for each customer dependent on which brand of module they buy first.

For the DIYer building modules for him/herself all of this is a lessor issue.

It seems there may be as many color schemes as there are builders, so who knows.

It is very interesting to hear the perspective of others.

p.

p.
Back to top
View user's profile Send private message
neandrewthal



Joined: May 11, 2007
Posts: 672
Location: Canada

PostPosted: Tue Mar 10, 2009 10:06 am    Post subject: Reply with quote  Mark this post and the followings unread

If I could start over I would do a banana frac, but these 60 3.5 x 8.75" panels and 1300 1/4" jacks I have lying around or already in use are telling me otherwise. Maybe after I run out of those Very Happy

peng wrote:


Everybody has Blue as CV inputs. It seems we came to a consensus naturally for that one.


I actually came up with my color scheme synthaesthetically, by closing my eyes and asking myself "If I were a CV input, what color would I be?" Maybe everyone else did the same


peng wrote:


I also have another agenda. I am trying to mate colored knobs with the relevant jacks. I don't really like how the grey knobs look, so I'm not looking to use grey jacks (unless it is some function that doesn't require an attenuator).

I don't know where to get pink jacks.
The blue jacks that BugBrand uses look a lot darker than the jacks I have. I like them darker (better matches the knob).



I'm trying to do the matching thing too, but I wasn't planning on it before I made my color scheme. Luckily the CV inputs and audio ins/outs are easy to match up with knobs, but I don't know what to do about pink knobs for pots that are associated with CV outputs.

_________________
" I went through quite a few trannies til I found one I liked" - Wild Zebra
Back to top
View user's profile Send private message
numbernone



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

PostPosted: Tue Mar 10, 2009 6:18 pm    Post subject: Reply with quote  Mark this post and the followings unread

I feel like the bad guys in 1984 or something...

All inputs-GRAY
Out (primarily audio)-WHITE
Out (primarily control)- BLACK

DUUUUULL DULL DULL DULL
But they do look nice against solid colored unlabeled panels.
Back to top
View user's profile Send private message
Luka



Joined: Jun 29, 2007
Posts: 1002
Location: Melb.

PostPosted: Tue Mar 10, 2009 6:30 pm    Post subject: Reply with quote  Mark this post and the followings unread

yup same here

out - blue
in - white

_________________
problemchild
melbourne australia
http://cycleofproblems.blogspot.com/
http://www.last.fm/user/prblmchild
Back to top
View user's profile Send private message
oscilloclast



Joined: Sep 29, 2005
Posts: 49
Location: VA

PostPosted: Tue Mar 10, 2009 8:05 pm    Post subject: Reply with quote  Mark this post and the followings unread

I've also been agonizing over this issue as I convert my 1/8 jack fracs to banana jacks. One of the big issues I have with separating audio and CV into different colors is that it seems like a false distinction. Except for signal that goes into a filter (which tends to be in the audio range) most other places that "traditionally" accept a CV signal can accept an audio signal and visa versa. In my mind the reason to go to banana plugs is to break out of the traditionally dictated rules about what types of signals should go where and really start exploring the full potential of a system. I'm leaning towards a separate color for:

AC signal in
AC signal out
DC signal in
DC signal out
Logic in
Logic out
sync
ground
etc.

In reality this kind of follows the Serge distinctions (separating AC and DC signals) (oops I seem to be getting back some traditionally dictated rules...._) which in my mind seems to be the only real concrete distinction you can make between signals (not including sync, triggers, gates etc). I think its worth giving some thought to the idea of forcing oneself to see the ways modules can interact in a different way then you are used too. For myself just going through the process of trying to figure out the banana jack color scheme has really opened my eyes to how I've pigeon holed myself into seeing module interaction in certain ways.

On a side note I really can't explain why but don't want to buy the Pomona cords (cost probably but I also don't like not being able to adjust the length of on my cords) so I've been looking everywhere for good quality, rear stackable (side stackable seems like a nightmare on a frac panel) cheap banana plugs that come in different colors. The best I've been able to come up with so far is the "quality banana plugs" at futurlec (http://www.futurlec.com/Banana-BananaPlugs.shtml), they come in five different colors, use a set screw (not solder), are rock solid, gold plated, rear stackable and are only 95 cents a piece. I also tried out the "stackable type banana plugs" from futurlec and they are absolute junk. Anyone else come up with a good source for banana plugs?
Back to top
View user's profile Send private message Visit poster's website
BananaPlug



Joined: Jul 04, 2007
Posts: 302
Location: Philly
Audio files: 5

PostPosted: Wed Mar 11, 2009 1:50 pm    Post subject: Reply with quote  Mark this post and the followings unread

I've bananafied an assortment of frac and euro and went with the Serge color scheme because I was already used to it.

FYI: Pomona's at less than $5 each here.


converted.jpg
 Description:
 Filesize:  22.68 KB
 Viewed:  7615 Time(s)

converted.jpg


Back to top
View user's profile Send private message Visit poster's website
frijitz



Joined: May 04, 2007
Posts: 1712
Location: NM USA
Audio files: 54

PostPosted: Wed Mar 11, 2009 3:09 pm    Post subject: Reply with quote  Mark this post and the followings unread

oscilloclast wrote:
One of the big issues I have with separating audio and CV into different colors is that it seems like a false distinction.

Agreed. I don't find that color coding helps at all with setting up a patch, anyway. I just use whatever colors I have on hand. Laughing

Quote:
On a side note I really can't explain why but don't want to buy the Pomona cords (cost probably but I also don't like not being able to adjust the length of on my cords) so I've been looking everywhere for good quality, rear stackable (side stackable seems like a nightmare on a frac panel) cheap banana plugs that come in different colors.

I've been using these lately:
http://emersonnetworkpower.com/webapp/wcs/stores/servlet/ESC/resources/1081083001.pdf
Available from Mouser as 530-108-1082-1 etc.

These guys also have a good selection, including nice colored cords.
http://www.testpath.com/Categories/Banana-Jacks-Banana-Plugs-2900.htm
http://www.testpath.com/Categories/Cal-Test-Test-Lead-Wire-23080.htm

Very Happy

Ian
Back to top
View user's profile Send private message
oscilloclast



Joined: Sep 29, 2005
Posts: 49
Location: VA

PostPosted: Thu Mar 12, 2009 8:37 am    Post subject: Reply with quote  Mark this post and the followings unread

Thanks for the lead on the colored test lead wire, looks like good stuff!

David
Back to top
View user's profile Send private message Visit poster's website
zthee



Joined: Feb 20, 2008
Posts: 413
Location: Stockholm

PostPosted: Thu Mar 12, 2009 2:24 pm    Post subject: Reply with quote  Mark this post and the followings unread

bbob wrote:
Red is used for trigger signals
Blue for DC coupled signals
Black for AC coupled signals
Purple is used for sync.


That's what I'm using. And by trying to be in the true nature of the Serge spirit - I'm breaking the rules as often as I can....

BananaPlug wrote:
FYI: Pomona's at less than $5 each here.


Thank you!!
Back to top
View user's profile Send private message
creatorlars



Joined: Nov 26, 2007
Posts: 524
Location: Denton, TX
Audio files: 4

PostPosted: Thu Mar 12, 2009 2:51 pm    Post subject: Reply with quote  Mark this post and the followings unread

I can vouch for Testpath -- ordered over 30 cables from them and they always ship really fast, and all the cables come individually wrapped!
Back to top
View user's profile Send private message Visit poster's website AIM Address
BananaPlug



Joined: Jul 04, 2007
Posts: 302
Location: Philly
Audio files: 5

PostPosted: Thu Mar 12, 2009 2:57 pm    Post subject: Reply with quote  Mark this post and the followings unread

Quote:
Red is used for trigger signals
Blue for DC coupled signals
Black for AC coupled signals
Purple is used for sync.

You can count on Red, Black, Blue. All the other colors are bit inconsistent over the years. My '80s stuff has grey sync jacks, a '90s panel has purple for the SSG coupler jacks and yellow for ADSR trigger inputs. Stuff I've converted or built uses Red, Black, Blue, Grey.

The Modcan A color code would be another established standard to look at. The logic stuff is red there too. I think this is all there is to it:
Red - Gates, Trigger, etc.
White - CV in
Grey - Signal in
Yellow - Any out that wouldn't be red
To me the white/grey distinction is vague and not as useful as the Serge blue/black. On the other hand the Modcan system ins and outs are never mistaken for each other, which is not true of the Serge.

The nice thing about standards is that there are so many to choose from.
Back to top
View user's profile Send private message Visit poster's website
peng



Joined: Feb 23, 2006
Posts: 109
Location: Chicago
Audio files: 2

PostPosted: Sun Mar 15, 2009 10:47 am    Post subject: Reply with quote  Mark this post and the followings unread

[quote="BananaPlug"]
Quote:

The Modcan A color code would be another established standard to look at.


My ladyfriend doesn't like the bright colors look (I do!). She thinks the Modcan A color scheme is more tasteful. Thing is, I want to build modules to sell (along with pcbs for SDIY). Modcan states that he doesn't want anybody else building in that format. I only want to build in 'open' formats (even for my own personal system). Plus, the color scheme looks bad with my colored knob plans. Grey Davies are not so nice.

p.
Back to top
View user's profile Send private message
bugbrand



Joined: Nov 27, 2005
Posts: 842
Location: Bristol, UK
Audio files: 1
G2 patch files: 1

PostPosted: Mon Mar 16, 2009 2:36 am    Post subject: Reply with quote  Mark this post and the followings unread

Heya Peng -- yeah, I saw your VCF design recently and it really caught my eye -- this is really fantastic to see more banana based Frac designs.

My choices (as written above) did come from semi-conscious-ways! Coupled with availability of parts -- sourcing of decent banana plugs & sockets really influenced the choice of colours as, as mentioned above, Rapid only do certain colours. Their ones are, in my experience, very good value and quality - the bum is that Rapid are not good for people outside UK. (though if you wanted some purchased and sent to you I'd be very happy to help)

I did think it important to highlight differences between inputs and outputs. Differentiating between audio & control signals, though, is quite a fuzzy line for sure - I think that as long as modules are well documented, people will quickly learn how things work. As noted, colours really do help give a quite instant recognition of function.

Its funny you went for green as audio input! Opposite to me.. Oh well.. (this comes, I guess in part, from my long standing use of coloured hookup wires - I always went for yellow on inputs and orange on outputs, so when it came to choosing banana colours..)

I had wondered about other colours for clocking / etc signals, but feel that they can fit very happily into the normal control signal family -- I think its a good design practice to have clock inputs with a low threshold level (say 1v) and polarity protected so you don't have to be too careful about the type of clocking signals used.

I haven't used black other than for system ground (between PSUs) and white is not in any use so far..

Oh - one thing - I've gone for keeping all my modules very shallow (max 3.5") to fit into custom 4" deep cases - I always thought Fracs were wasting a load of space.

Great stuff!

_________________
http://www.bugbrand.co.uk
http://www.bugbrand.blogspot.com
Back to top
View user's profile Send private message Visit poster's website
peng



Joined: Feb 23, 2006
Posts: 109
Location: Chicago
Audio files: 2

PostPosted: Sun Mar 22, 2009 6:23 pm    Post subject: Reply with quote  Mark this post and the followings unread

bugbrand wrote:
I think that as long as modules are well documented, people will quickly learn how things work.


Good point. Umm...gotta go write out that Delta VCF doc! Very Happy



bugbrand wrote:
I think its a good design practice to have clock inputs with a low threshold level (say 1v) and polarity protected so you don't have to be too careful about the type of clocking signals used.


Agreed.



bugbrand wrote:
Oh - one thing - I've gone for keeping all my modules very shallow (max 3.5") to fit into custom 4" deep cases - I always thought Fracs were wasting a load of space.


Ohh! My Delta VCF pcb is 5" x 3.5". Frac needs to be mounted the long way so I actually use up all the space in a 6" depth! Sad
This is because I use the same pcb for my Fracanana modules and my large 1/4" jack format. This may change in the future so I will definitely keep the 3.5" depth in mind if I decide to do different pcbs for frac and large format.

Thanks for getting in on this conversation and best of luck with the modules. I hope they are selling well.

P.
Back to top
View user's profile Send private message
creatorlars



Joined: Nov 26, 2007
Posts: 524
Location: Denton, TX
Audio files: 4

PostPosted: Tue Mar 24, 2009 8:08 am    Post subject: Reply with quote  Mark this post and the followings unread

While we're on the topic of specs for Banana jack SDIY, what about tackling the issue of modules designed to use switched jacks, and converting them for bananas?

I run into this quite often -- I generally add a toggle switch, extra jack, a push/pull pot, etc. as works with the module, but I wonder if any of you have any other ideas or suggestions? For example, does a simple signal detecting circuit exist that could trigger an electronic switch for this kind of purpose?
Back to top
View user's profile Send private message Visit poster's website AIM Address
peng



Joined: Feb 23, 2006
Posts: 109
Location: Chicago
Audio files: 2

PostPosted: Tue Mar 24, 2009 9:48 am    Post subject: Reply with quote  Mark this post and the followings unread

creatorlars wrote:
While we're on the topic of specs for Banana jack SDIY, what about tackling the issue of modules designed to use switched jacks, and converting them for bananas?


I've used shorting double plugs on a lot of modules. The frac version of the Delta VCF can also use a shorting plug between the VCF out jack and the VCA in jack. The jacks have to be spaced 0.750" apart. I have always thought these would be great in stand alone type instruments and the Buchla Music Easel uses them to great effect.

The other way I've done it is with toggle switches but, for me, a switch is the most expensive panel component so I try to be conservative with how many I use (!). On the other hand, a switch is playable and can be used to good effect.

As far as a special circuit goes...I'm not having any great ideas. Maybe a comparator(s) to sense if the input signal deviates from 0V which turn on the jack input and turn off the 'normalled' input?

p.


blue delta shorting plugfront.jpg
 Description:
 Filesize:  49.26 KB
 Viewed:  7167 Time(s)

blue delta shorting plugfront.jpg



blue delta shorting plug.jpg
 Description:
 Filesize:  131.51 KB
 Viewed:  111 Time(s)
This image has been reduced to fit the page. Click on it to enlarge.

blue delta shorting plug.jpg


Back to top
View user's profile Send private message
peng



Joined: Feb 23, 2006
Posts: 109
Location: Chicago
Audio files: 2

PostPosted: Tue Mar 24, 2009 9:51 am    Post subject: Reply with quote  Mark this post and the followings unread

peng wrote:

Maybe a comparator(s) to sense if the input signal deviates from 0V which turn on the jack input and turn off the 'normalled' input?


I should have added: Turn on and off an analog IC switch.
Back to top
View user's profile Send private message
loss1234



Joined: Jul 24, 2007
Posts: 1535
Location: nyc
Audio files: 41

PostPosted: Sat Mar 28, 2009 4:11 pm    Post subject: Reply with quote  Mark this post and the followings unread

wow

this is a very inspiring thread!

now that i know pomonas are cheap...can anyone recommend a properly sized Jack and a good supplier?

thanks

_________________
-------------------------------------------- check out various dan music at: http://www.myspace.com/lossnyc
http://www.myspace.com/snazelle
http://www.soundclick.com/lossnyc.htm http://www.indie911.com/dan-snazelle
Back to top
View user's profile Send private message
creatorlars



Joined: Nov 26, 2007
Posts: 524
Location: Denton, TX
Audio files: 4

PostPosted: Sat Mar 28, 2009 4:44 pm    Post subject: Reply with quote  Mark this post and the followings unread

I use Pomona cables and the Johnson/Emerson jacks and purchase them from Mouser:
http://www.mouser.com/Search/ProductDetail.aspx?R=108-0903-001virtualkey53000000virtualkey530-108-0903-1

They come in several colors and work great! Can anyone confirm that Serge/Buchla use these jacks too? Pretty sure Serge systems do...
Back to top
View user's profile Send private message Visit poster's website AIM Address
Display posts from previous:   
Post new topic   Reply to topic Moderators: jksuperstar, Scott Stites, Uncle Krunkus
Page 1 of 2 [35 Posts]
View unread posts
View new posts in the last week
Goto page: 1, 2 Next
Mark the topic unread :: View previous topic :: View next topic
 Forum index » DIY Hardware and Software
Jump to:  

You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You can download files in this forum
e-m mkii

Please support our site. If you click through and buy from
our affiliate partners, we earn a small commission.


Forum with support of Syndicator RSS
Powered by phpBB © 2001, 2005 phpBB Group
Copyright © 2003 through 2009 by electro-music.com - Conditions Of Use