Analog Noob Question

  • Anyone know of a clear cut, beginner's level explanation, anywhere on the web that could explain how to solder together some kind of converter cable to convert between euro rack and banana style plugs?
    (Actually what I need is not so much euro rack, but rather how to go from a dc-coupled interface like my motu ultra lite into banana jacks... For example, to use stretta's 'beap'(sp? ...forgot what it's actually called :p) or something similar with a banana-plug based synth... But euro rack would be more pertinent here for all the aleph users(I think?) and if I got the explanation for eurorack2banana, I'm sure I could figure it out for regular dc-coupled 1/4-inch or XLR... I'm mainly confused about proper grounding ;p)

  • This may be a good start
    http://www.muffwiggler.com/forum/viewtopic.php?t=96739&highlight=banana+cable

    beyond that, I'd do an Advanced search on muffwiggler.com for topic titles in the Music Tech/DIY subforum that contain: banana, 1/4"

  • i realize you want to diy, but here are some options for purchase from low-gain:

    http://foxtonemusic.com/manufacture/low-gain-electronics/low-gain-electronics-utl-1-utility-box.html
    http://foxtonemusic.com/manufacture/low-gain-electronics/low-gain-utl2.html

    They seem robust and have a grounding jack to connect to your banana system

  • a couple really simple pointers:
    - patching between devices with separate power needs a common ground. you'll need to add a 'ground' point to the banana system if there isn't one available.
    - bananas are super simple — 1 conductor. that's it.
    - dc-coupled just refers to signal being able to maintain a non-zero voltage
    - ac-coupled refers to signals that wrap around zero-volts (most audio signals)

    for the adaptor cables from euro (3.5mm) to my banana modular, i've made 3 cables that are just a normal banana jack with the connector cut off one end and a 3.5mm jack on the other connected to the 'tip'. the 'sleeve' remains unconnected.

    then i made 1 special cable which has 2 banana cables coming from a single 3.5mm jack. one connected to signal, and the other to ground (mark this one!). then i plug the ground into the ground jack on my modular and everything works fine.

    if you don't have a 'ground' jack on your banana box, you just need to find some exposed metal to attach a ground conductor to (don't use aluminium as it won't conduct due to oxidised outer layer).

  • I also read somewhere that if you connect your two systems to a common mixer then they will have a common ground. But don't blame me if your studio blows up :)

  • http://hellospiral.tumblr.com/diyresources

    also if you want a box similar to what @drtung posted...repeater makes them

  • I'm probably mistaken but I thought plumbutters came with a grounding jack? It would be the only black one on it. But if there was you probably wouldn't be asking the question :)

    Here is a post about adding a nana ground jack to a cocoquantus. Should be a similar procedure for the PB:

    http://pugix.com/synth/cocoquantus-battery-clip-and-ground-jak/

    Once you have the jack, just make a cable that's banana on one end connected to the ground lug of an 1/8" jack for euro, or 1/4" for your motu and connect to an unused plug on whatever system you are connecting the PB to.

    It's also been confirmed that if you connect the 1/4" audio outs from the PB to the same mixer as any other system you are trying to interface with, that will ground it as well.

    This is all going off of the ridiculous amount of time I've been spending lately researching the cocoquantus. Can't decide whether to go for that or an aleph - first world problems fo sho.

  • mannn the goats are gonna be pissed!!

  • mannn the monome employee is gonna be pissed!!

    j/k raj

  • @karaokaze interested to see what you produce with the plumbutter!

  • Haha, thanks again all! Employees and goats alike :D

  • think i'm just jealous :-D