syddd
Meter Reader 1st Class
Posts: 59 
Likes: 9
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Post by syddd on Jul 13, 2017 5:37:19 GMT -5
Hello, Just looking to have a sanity check for the below schematic, is there anything glaringly obvious that I've overlooked here? (Truth Table at bottom of image) Wiring Diagram is 4P5T superswitch with 8PDT rotary switch. Poles marked with concentric circles.  |
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Post by JohnH on Jul 13, 2017 16:29:36 GMT -5
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Post by newey on Jul 13, 2017 21:16:27 GMT -5
sydd- I'm trying to vet your diagram, but my head is swimming.  Where do you show the signal exiting these switches? |
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Post by reTrEaD on Jul 13, 2017 23:36:17 GMT -5
sydd- I'm trying to vet your diagram, but my head is swimming. Where do you show the signal exiting these switches? My head was also swimming and I gave up. If you're in the mood to press on, look at it from this point of view: Neck (+) is always connected to hot (volume pot at the top of the diagram) Neck (-) is assigned to the upper right pole Middle (+) is assigned to the lower right pole Middle (-) is assigned to the upper left pole Bridge (+) is assigned to the lower left pole Bridge (-) is always connected to ground. There's a lot going on because the way to make a pickup connection to ground, hot, or another pickup lead is through a throw, often via the rotary switch. Also the Neck pickup is being shunted whenever it isn't used, adding to the clutter. |
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Post by JohnH on Jul 13, 2017 23:48:28 GMT -5
Hi Sydd - it looks like you have 3 out of the 4 of us who usually look at diagrams all collapse in a smoking heap! - there may be a lesson in that somewhere about simplicity...
That leaves sumgai, and to paraphrase, you don't want to make him come down there!
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Post by newey on Jul 14, 2017 5:54:28 GMT -5
I haven't (yet) collapsed in a heap, and I gave up smoking years ago.  But I'm still having problems. If the (unshown) output is through the pot, then neck + is permanently connected to output. Let's trace out what happens at Pos. #5 on the SS, with the rotary at position #1. Per your truth table, this should give the N alone. So, we have the N+ permanently to output, let's trace the neck ground to see where it gets grounded. For ease of discussion, I'm going to lable the commons of the SS as follows: A B1 1 2 2 3 3 4 4 5 5 1 1 2 2 3 3 4 4 5 5 C DAt pos 5, the neck - is connected to B, which is in turn connected via a red wire to D5- where it connects to the D common, as well as to ground via the rotary sw #6 pole. howwever, D is also connected to M +. M - is connected to pole A of the SS, which in turn gets grounded through A 5 via the rotary at pole 7. So as I see it, instead of N alone at SS position 5, rotary 1 (as per the truth table), you'll have N + (N X M). This is as far as I got so far, but I see problems already. |
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Post by sumgai on Jul 14, 2017 9:11:47 GMT -5
Call me the "men in white coats..."
And yes, I am coming down there, and it's not gonna be pretty.
syddd,
You've been a Nutz for more than 20 minutes, you should've remembered that Mike Richardson has already done this. Well, with 9 of the 10 combo choices, anyway. Please, for the love of the environment (no more smoke-spewing heads!), just implement either of Mike's lash-ups, and be done with it. Time tested by many, many players, I don't think you're gonna be sorry.
That's all I'm gonna say on the subject, this time I'm on a connection of varying quality (from bad to worse  ), so I probably won't be checking back in until sometime Friday night or Saturday morning. (For those of you on the other side of the date line, advance one day for calculation purposes.)
sumgai
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Post by Yogi B on Jul 17, 2017 23:47:40 GMT -5
it looks like you have 3 out of the 4 of us who usually look at diagrams all collapse in a smoking heap! : It is at times such as this I've been turning to 'Secret Project Q', my attempt to alleviate myself (and maybe one day, others) from that prospect, and instead place burdens of this kind on computers -- and in the process I sincerely hope I've also eliminated the chance of collapsing into smoking heaps. I've vaguely hinted at this before, but on and off over the past few years (although mostly off), I've been prototyping a program that can takes a guitar wiring scheme as input and outputs a switching truth table, plus diagrams of what elements are connected, for debugging flawed wiring schemes. It's also set up that some level of frequency analysis should be easy to include, though I'm not trying to rival your excellent GuitarFreak. In it's current basic state it is usable and I've found it reliable enough at it's primary objective, which is probably the reason it's stagnated -- now that it 'works' enough for my personal use, I've lost motivation to improve it further. Hopefully though, mentioning it now should be enough to spur me on a bit... we'll see.
syddd : If sumgai is the "men in white coats", then in this instance I'm the 'enabler'... Anyway, after looking over your diagram myself, and confirming it with the aforementioned program, I'm pretty confident that it does achieve the switching as outlined in the truth table. Since I've stated that the diagram is correct, that implies newey's thinking on the neck only position must be incorrect, so I'll aim to counter that here: At pos 5, the neck- is connected to B, which is in turn connected via a red wire to D5- where it connects to the D common, as well as to ground via the rotary sw #6 pole. however, D is also connected to M+. M- is connected to pole A of the SS, which in turn gets grounded through A5... I've highlighted (well emboldened actually) the important bits, to hopefully make it evident that the middle pickup is shorted across ground, thus we only have neck pickup selected. Nevertheless, I'll also agree with the general consensus that you should consider the simpler schemes out there, but I'll tentatively state that there might be room for some simplification whilst still retaining the same function, but whether it's enough to allow for the use of a 4pdt instead of the rotary I'll leave for some other time. |
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Post by JohnH on Jul 18, 2017 6:18:13 GMT -5
yogi - your Projeect Q sounds cool. I hope youll tell us more about it!
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Where do you show the signal exiting these switches?
But I'm still having problems.
), so I probably won't be checking back in until sometime Friday night or Saturday morning. (For those of you on the other side of the date line, advance one day for calculation purposes.)
