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Rynoi5e
Joined: Feb 29, 2012 Posts: 5 Location: Little Beirut
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Posted: Mon Mar 02, 2015 5:24 pm Post subject:
Why banana jacks? |
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I've noticed that pretty much all the Lunetta style projects use banana jacks. Why is that? Would it be possible to use 3.5 mm jacks instead, so as to interface with Eurorack gear? |
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commathe
Joined: Jul 26, 2013 Posts: 153 Location: Beijing
Audio files: 5
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Posted: Mon Mar 02, 2015 9:48 pm Post subject:
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You could, but you'd need to be extra careful about protection. 3.5mm connectors short to ground as you plug them in so CMOS chips could blow if they don't have some sort of current limiting on the output. Similarly, euro outputs could easily exceed the rails on a lunneta circuit so you need to protect against that too.
If patching freely is an absolute necessity you will either have to add clamps to every lunneta input and other protection to both inputs and outputs. Otherwise, you can create a "breakout" module which can just be a passive connection between two jack with this protection between them.
However, what if someone who doesn't know uses you modular and fries your lunneta modules by plugging a euro output in to one? |
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Rynoi5e
Joined: Feb 29, 2012 Posts: 5 Location: Little Beirut
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Posted: Mon Mar 02, 2015 10:19 pm Post subject:
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Just the kind of response I wanted, thanks! So, could this be accomplished by merely using resistors to limit the current? |
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commathe
Joined: Jul 26, 2013 Posts: 153 Location: Beijing
Audio files: 5
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Posted: Mon Mar 02, 2015 10:27 pm Post subject:
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That's just one of the things you have to do. You also have to limit the voltage to within the rails that the CMOS chips are powered by. Look up "diode clamps"
Personally, I prefer to use banana jacks to keep things separate and stop me accidentally plugging things into unprotected inputs. It's a physical fail safe |
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okelk
Joined: May 08, 2014 Posts: 71 Location: Vienna
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Posted: Tue Mar 03, 2015 2:50 pm Post subject:
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I simply chose bananas because I want my lunetta-projects to be simple and cheap and cheap chinese bananas are the cheapest 'real' connectors I could find.
Also I wouldn't feel comfortable having the same jacks as on my other modular equipment without any protection against negative voltages etc...
...but I will add banana to 3,5mm adapters to my lunetta soon to make it easier to interface with my other synth.. |
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PHOBoS
Joined: Jan 14, 2010 Posts: 5591 Location: Moon Base
Audio files: 705
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Rynoi5e
Joined: Feb 29, 2012 Posts: 5 Location: Little Beirut
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Posted: Tue Mar 03, 2015 8:51 pm Post subject:
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Hmmm... well banana jacks it is, haha. At least until I acquire more electronics knowledge...
Thanks, everyone! |
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DUBmatze
Joined: Feb 18, 2013 Posts: 150 Location: south Germaica (schwabilon)
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Posted: Fri Mar 06, 2015 3:36 pm Post subject:
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i also use bananajacks. my breadboard got some of them so i can connect direct to the breadboard and a bonus is i can use aligatorclips direct in a banana jack.... |
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droffset
Joined: Feb 02, 2009 Posts: 515 Location: London area
Audio files: 2
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commathe
Joined: Jul 26, 2013 Posts: 153 Location: Beijing
Audio files: 5
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Posted: Thu Mar 19, 2015 6:32 pm Post subject:
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Those are the ones I use too! I have a supplier here in China that does them in lots of colours (even purple and brown!). I particularly like that you can route higher frequency signals through your skin by touching two points! |
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