iant412
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Post by iant412 on Jun 7, 2010 22:35:25 GMT -5
So here is the general idea: I have a double neck Carvin bass/guitar. It has 2 outputs & a 2 way selector to switch between the bass & guitar. The current 2-way switch has 6 terminals on it. It is wired such that on the guitar 1 wire goes to the pickup selector & 1 to the output jack. Same with the bass. I want to be able to select either the guitar, the bass, or both. They each have volume controls for each pickup, tone control + coil splits. Do I simply need a DTDP On/On/On switch? Stock info on the guitar is here: www.carvinmuseum.com/decade/images/80-dn640.htmlWiring info here: www.carvinmuseum.com/decade/images/80-controls.htmlAs far as I know, and from what I can tell, no mods have been made to it...yet.
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Post by wolf on Jun 7, 2010 22:54:12 GMT -5
I'd say what you need is just a single-pole double throw center on switch. This is the switch found on the millions of Gibson Les Paul's and SG's but I wouldn't use the official Gibson switch. It is huge and requires a lot of wood to be removed from the guitar body.
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iant412
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Post by iant412 on Jun 8, 2010 20:13:16 GMT -5
Are you sure about that? There is a DPDT On/On in there now. Guitar On/Bass On. A single pole would only have 3 terminals. 4 terminals are being used right now. 1 wire from each volume control (bass & guitar) and 1 wire to each output jack (bass & guitar). Don't I need a DPDT On/On/On? I wire Bass volume to top right terminal, Guitar volume to bottom left terminal. Bass to jack middle right, Guitar to jack middle right. Thus I am not using the top left or bottom right terminals. Should this not give me what I'm looking for? Up position - Bass Middle position - Bass + Guitar Down position - Guitar
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Post by wolf on Jun 8, 2010 21:27:40 GMT -5
iant412Here's how to do this with a SPDT center-on switch: and since I previously mentioned the Gibson type of switch, here is how that works:
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Post by newey on Jun 8, 2010 21:40:41 GMT -5
I think you mean "guitar to jack, middle left" I'm a bit unclear on what you intend here, and the Carvin diagram doesn't help matters much, it's more stylized than informative. As I understand it, you currently have 2 separate output jacks, one for the bass and one for the guitar. Currently a DPDT switch selects either the bass output or the guitar output, but not both at once. Correct me if I'm wrong, but you want a 3-position switch to allow both outputs to be active at once. Presumably, you want to do this so you can be a-bassin', and just move over to guitarin' without flippin' a switch. You should consider that, with both outputs active at once, sympathetic vibrations from the bass will likely induce a signal through your guitar pickups, which will also be active in the mid position. And vice versa, if you're on the guitar- although the bass is probably more likely to cause an issue. I'm not sure the resulting effect is going to be to your liking. I suspect Carvin had a good reason for the either/or setup they used. But, to answer your question, and assuming I'm right about what you want here, you are correct, you need 2 poles to feed 2 separate output jacks. Wolf's way of using a SPDT center-on would result in the guitar and bass outputs being combined (and going to both jacks at once); I don't think he understood you were talking separate outputs.
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iant412
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Post by iant412 on Jul 17, 2010 19:48:08 GMT -5
Newey...I think you are right.
Christian from El Ten Eleven modified his Carvin in a similar way. I talked to him about it, but he didn't do it himself so he didn't have specifics.
I put in the DPDT switch, however only one pickup each seem to work on both the bass & guitar and tone control doesn't work. I'm going to diagram out the wire routing that they had. Perhaps that will help.
Stay tuned.
Ian
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iant412
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Post by iant412 on Jul 17, 2010 20:36:40 GMT -5
Can anyone post a picture of the diagram that I drew? Does it have to be hosted somewhere & linked to?
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Post by newey on Jul 17, 2010 20:38:45 GMT -5
Inserting the new guitar/bass selector shouldn't have affected any of these things. If your wiring of the new switch were a problem, you'd either get no output at all in one or more positions, or not get the output you wanted at a particular setting. Does the new switch work as intended? Sounds like you may have joggled a connection (or a couple of connections) loose in the modding process. And, yes, a diagram would be a good start . . . EDIT:Iant- We cross-posted. To post images: Image Posting
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