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Post by ChrisK on Dec 31, 2008 15:01:14 GMT -5
Yep.
I'll look at your new design later. I have New Year Eve family stuff to do and I also have to write and publish a technology position paper today (I'd said that I'd do it by the end of the year).
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Post by ChrisK on Dec 31, 2008 14:57:39 GMT -5
Oh, sorry, I wasn't aware that the Tri Tone Switch was an additional coil split switch.
I'd assumed that it was your name for the 3-way pickup selector switch.
You could still use it with the SD pickups if they are 4-wire.
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Post by ChrisK on Dec 31, 2008 12:20:47 GMT -5
The 3-way pickup selector toggle switch has its output contact(s) connected to the output jack tip terminal. Its mechanical frame is connected to the output jack ring terminal, which is the wiring ground. It does not switch the ground, only the pickup output signals. The 3-way pickup selector toggle switch has its input contacts connected to the output terminals from each volume pot. Good job! What lawsuit situation? If it's related to the copying of designs by the Japanese many years ago, no one cares today. If it's related to a possible safety lawsuit, I don't understand what you are saying. ""....and connected the bridge pickup straight to the volume pot Hot to Hot and Ground to the back of the Pot, just like the bridge pickup."" Yep, standard wiring practice. Yes, but you have to make sure that you connect EVERYTHING wrong. ;D ;D No, a passive electric guitar develops 1 volt AC maximum. The guitar in and of itself won't shock anything (well, maybe a little if you stick the other end of the cord in your mouth, play real hard, and do the "9 volt battery tongue test"). Oh, come on, every kid tested 9 volt batteries this way. As newey mentions, the potential shock hazard comes from an amp that has an internal failure that places high voltage on its input lead (rare), or has its chassis and hence the guitar cable shield elevated to mains potential. The latter can occur when the wiring in the building outlets is defective. Many amps from the 50's, 60's, and perhaps later had a two terminal line (mains) cord. One wire in a U.S. outlet is at neutral potential, but the other is at full line potential. Neither should be connected to the amp chassis, but the neutral side might be thru a polarized cord (who knows who did what when). What was often the practice was to have a switch on the amp that connected either line cord conductor to the amp chassis thru a capacitor to reduce hum. Some amps had a capacitor from both leads to the chassis. If that capacitor(s) has failed or is excessively leaky, mains potential could be applied to the chassis, to the shield, and to your body. One can prevent such issue by using RF (wireless). Only lightning can jump that big of a gap. ;D ;D But, don't depend on RF to protect you in a lightning storm, use a #1 iron. Even God can't hit a #1 iron............ The best approach is to buy an outlet tester that will indicate if there are any problems. Test every outlet before you plug in to it. After all, you don't know where its been or who its been with. Yeah, I also get a lot of requests when I sing.
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Post by ChrisK on Dec 31, 2008 2:04:27 GMT -5
The design that I have in "Fun with Switches Take 1" is a series override switch. It puts both pickups in series regardless of the 3-way switch position. This means that you can have one pickup phase reversed while using them individually, with no apparent difference in sound of the one compared to when it is not out of phase, but when in series override, they are then out of phase. Series out of phase (soop) is much more interesting sounding that parallel out of phase (poop). When in parallel, both volumes work only on their respective pickup. When in series, one is a master volume and the other is a pickup shunt. Both pickups can also be shunted by their respective tone controls. This has an interesting effect in that if one pickup's tone is turned down in series, the other pickup is made brighter. Since you want the bridge volume to be the master, it will be pickup "B" and the neck will be pickup "A". This means that the bridge will be the elevated pickup in series and the neck will be ground referenced in either mode. Having the shunting on the neck will allow you to dial in or out varying amounts of fundamental frequencies from the neck (which has fewer harmonics that the bridge) that are subtracted from the bridge in soop mode. It will also be good that the series/parallel switch will be on the bridge/master volume; your hand will already be on the appropriate volume control.
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Post by ChrisK on Dec 31, 2008 1:45:51 GMT -5
P-90. Yep, only one rail per pickup. Maybe they call it P-Rails 'cuz they want folks to buy them in sets (two rails per set of two). Or, maybe they expect them to be selling like hot cakes (Ya, them P-Rail's be going oot the door in droves, you betcha'). Or, maybe they don't understand the difference since all the other rail pickups had 'em in twos (and, there IS marketing involved). They are somewhat costly. However, I'm of the opinion that the P-Rail is the first humbucker pickup design that is actually meaningful to use with most complex coil splitting/selecting wiring schemes. Disparity is. And, may the tones be known. Select the "videos" link. This is the thread I started on the P-Rail pickup. P-Rails (or not)The only spec that most pickup makers state is the resistance, which is just one component of impedance. It only absolutely tells one the resistance of the coil winding. That being said, a lipstick is a low output voltage pickup and a rails type generally is a high output voltage pickup. They may well not mix well. How are you going to fit a lipstick into the neck humbucker cavity? Is it a dual coil/tube lipstick? The SD JB is a higher output voltage pickup and the SD Jazz is a lower output voltage pickup, but these do mix well. If the guitar has a volume and tone for each pickup, use them! I use audio taper for both.
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Post by ChrisK on Dec 30, 2008 22:11:35 GMT -5
Welcome a'board. That's why we're all here. In lieu of emailing, one can feel free to post one's queries here for all to see and learn from.
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Post by ChrisK on Dec 30, 2008 22:07:56 GMT -5
There are several problems with your design.
Before I correct them I need to know what you want the volume controls to do in series.
As I had mentioned, if you look in "Fun with switches, take 1", section "E" for LP usage, you'll see how the reversed (from your perspective) LP volume wiring can be used to good effect.
Volume pot "B" remains as a master ratiometric volume pot for the series chain, but volume pot "A" just shunts (gradually shorts out) the "A" pickup.
It's difficult to do anything else without requiring the 3-way switch to also be in a specific position for series.
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Post by ChrisK on Dec 30, 2008 12:03:45 GMT -5
The "Everything Axe" is kept hidden along with the 65 mpg automobile. God forbid that anyone would think that one guitar could do "everything". ;D After all, no one would then need wiring help with anything......
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Post by ChrisK on Dec 29, 2008 18:20:26 GMT -5
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Post by ChrisK on Dec 29, 2008 17:56:19 GMT -5
Series_Parallel Blend Pot w/ DPDT switch
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Post by ChrisK on Dec 29, 2008 17:51:42 GMT -5
No, but to me it's half way to where it should be for series. I have seen it many places. It's called the "reverse LP wiring" and is effected to prevent widespread confusion amongst the feeble-minded during 3-way switch positioning. It is also used to reduce the product warranty returns from those that are convinced that "something" is defective (something is). I am of the opinion that normal volume pot usage is to be avoided during series connection of two pickups in guitars with individual volume pots. This is because, if the volume pot is turned down, regardless of the wiper or end termanal connection to the selector, substantial series resistance is introduced into the signal chain. I prefer to use volume pots in a ratiometric manner (3 terminal) in parallel and in a rheostatic manner (two terminal) in series. See Series_Parallel Blend Pot w/ DPDT switch. If you look in Fun with switches, take 1, section "E" for LP usage, you'll see how the reversed (from your perspective) LP volume wiring can be used to good effect. Volume pot "B" remains as a master ratiometric volume pot for the series chain, but volume pot "A" just shunts (gradually shorts out) the "A" pickup.
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Post by ChrisK on Dec 29, 2008 17:27:59 GMT -5
In this case, this pic is worth two words; "star topology" it is. The reason that I asked about the brick power supply is because in the electronics industry, these are what are known as brick power supplies; www.coselusa.com/
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Post by ChrisK on Dec 29, 2008 17:25:42 GMT -5
Rail pickups such as the SD Hot Rails are dual rail humbucking pickups and as such, have no polarity or phase to be concerned about unless spilt. And the thin ones are most excellent as tight jar lid removers.
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Post by ChrisK on Dec 29, 2008 17:16:35 GMT -5
Great article, great guitar!
Be sure to wear your safety glasses; I wouldn't want anyone to loose an eye when you fire that thing up....
BTW, your "wiring" link didn't work.
I fixed it (no "" can be used around the url http....... link).
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Post by ChrisK on Dec 29, 2008 17:12:11 GMT -5
The duncanamps links and the ax84 links will go a long way to showing how to do this.
"Schematic" is only a different language.....
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Post by ChrisK on Dec 29, 2008 17:02:19 GMT -5
I would be careful about doing so since this is (now) a vintage pickup pushing 30 years old. It's from the early days of the "boo-teak" pickup industry and will be worth far more "unbutchered" when these things become collectible. Also, the chances are that the patient will not recover from the surgery. Buy a new 4-wire pickup for the neck, the SD Jazz is nice. I will restate this in signal flow terms that the wires from the outside lug of the volume pots are going to the pick up selector. This is to avoid one volume pot set to off from shorting both pickups when the 3-way switch is in the "both" position. This is usually only an issue for folk that fail to understand that if you want one volume pot set to off (uh, that pickup is really off), use the correct switch position (which is not the middle/both one). (Now don't tell anyone, but if one has the wipers of the volume pots connected to the selector switch and wants to use only one pickup and the other pickup's volume pot IS turned fully off, the 3-way selector switch can be used as a, uh, shorting kill switch in two out of three positions. Unfortunately, if the end terminals of the volume pots are connected to the selector switch and the other pickup's volume pot IS turned fully off, the 3-way selector switch can be used as an opening kill switch in only one out of three positions.) ;D ;D
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Post by ChrisK on Dec 29, 2008 16:25:29 GMT -5
What does "no output" mean? Does it sound completely dead (circuit shorted) or do you still hear some hum (circuit open)?
Since the switch just switches in the bridge pickup regardless of the setting of the 5-way switch, it should in no way cause a loss of output signal. Something GeFooey is afoot.
Use your multi-meter* to measure the resistance at the guitar output jack. If you don't have the pick guard off, use a guitar cable and touch the leads to the unplugged other end.
Turn all pots to "10"/full on.
Record the resistance for each position of the 5-way with the push pull switch down (bridge is NOT switched in always).
Pull up the push pull pot knob (bridge IS switched in always) and record the resistance again for each position on the 5-way.
Post all 10 results. They should be around 3 to 15 K Ohms (depending on the Lace pickups used). Use the 20 K Ohm scale on your multi-meter*.
Can you post some well-focused pics of your wiring?
*If you don't have a multi-meter, go buy one. A $10 - $20 3 1/2 digit one is ok.
Working on wiring without one is akin to driving with your eyes closed; while things may go ok for a while........
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Post by ChrisK on Dec 28, 2008 18:54:56 GMT -5
Hmmm, I think that we've miscommunicated. I don't want you to describe the wiring, I want you to trace the circuit and post a schematic of the wiring. Including the caps and resistors and their values is critical to understanding the amp. Here's an example that will show the symbology for most of the components that you will find. ax84.com/static/p1/AX84_P1_080708.pdfAlso, in your description, there seems to be a lot of grounding going on. I don't understand the precedence of your descriptions.
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Post by ChrisK on Dec 25, 2008 22:56:44 GMT -5
Many. Under construction I have 7.
Most are rear-rout.
Using copper foil seems to be problematic especially in bodies that have a less than flat cavity bottom. Some painted ones have points sticking up.
I just found some 12" by 18" sheets of unetched 1/32" glass epoxy single-sided copper-clad PCB stock in my basement. I think that I'll use this for the cavity bottoms, especially on the rear-rout bodies. This will ensure a good non-tearing surface for soldering the cavity side foil to and for the pot shaft bushings, which will keep it in place.
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Post by ChrisK on Dec 25, 2008 22:41:54 GMT -5
It's not much of a choice. The only difference is whether the middle pickup is a humbucker or a single coil. It's not enough to get me even moderately interested.
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Post by ChrisK on Dec 25, 2008 22:12:20 GMT -5
Somebody once asked Cheech if he liked country music.
He asked "which country?"
I don't like today's country music, but I do like the real old stuff and bluegrass.
I got Brad Paisley's album "Play" (primarily instrumental) for Christmas. I haven't fully listened to it yet, but I do like what I hear so far.
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Post by ChrisK on Dec 24, 2008 22:49:52 GMT -5
StewMac makes a wood block for this. Trilogy vibrato cavity filler blockTo find this on their web site one has to know EXACTLY where it is (after stumbling across it). I don't know whose cavity it fits exactly (and neither do they).
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Post by ChrisK on Dec 24, 2008 22:38:51 GMT -5
This would be disconcerting if it had been posted by someone that had relocated based on the availability of alfalfa (for farm animals).
Just wait, you're next. ;D ;D ;D
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Post by ChrisK on Dec 24, 2008 22:34:11 GMT -5
angelodp, You're confusing the stuffing out of me. Didn't we just have this whole dang series conversation here? 1457 new build wiring helpHowever, if you're just checking, then yes, you are "seriously" correct.
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Post by ChrisK on Dec 24, 2008 12:57:11 GMT -5
Hmmm, maybe it's because the Tremo'Leo-No is actually a Vibrato-No. If it is as described in the forum that Cyn linked to, maybe you should just block the vibrato and return the Tremol-No or wait for the functioning version thereof.
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Post by ChrisK on Dec 24, 2008 12:36:15 GMT -5
Finally!
You will be concerned to know that, at one time I was in the Army, stationed with the Air Force, and often wore civilian clothes. I also carried a concealed side arm (in theory to commit suicide in the event of capture) and had access to the suite of nuclear battle plans (you really DON'T want to know).
Area 51 was just small beer.
Remember,
Aerospace engineers make weapon systems,
Civil engineers make targets.
Merry Christmas to all.
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Post by ChrisK on Dec 24, 2008 10:34:54 GMT -5
Oh man, I gots to agree with Cyn.
My wife's BD is the 19th of Dec. and it's a struggle to differentiate it into a separate event of its own import (which it is).
It's a somewhat somber event in that she's just a few/several/many/ain't/gonna/tell weeks older than me.
I never say it, but it's always in the air.
Have a great one (or two if'n you can swing it). And tell your wife that ChrisK sez that you definitely NEED another guitar.
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Post by ChrisK on Dec 23, 2008 19:56:08 GMT -5
It looks fine.
You don't need to short both the output jack tip and the pickups in "kill". Just the signal at the jack tip will do (SPST).
I didn't check the MR wiring, that's your responsibility.
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Post by ChrisK on Dec 23, 2008 19:48:53 GMT -5
They have those pesky little detail things inside like a circuit breaker and transient/over voltage protectors.
What does "a brick power supply" mean? Is the "brick method" a star topology (I know what a daisy chain topology is)?
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Post by ChrisK on Dec 23, 2008 19:41:47 GMT -5
That depends on the output level, impedance, and the input requirements of the "another" amp. Since the preamp has a master volume as the last element in its structure (which seems to imply that the output can be turned down to zero), likely the answer is yes.
Uh, well, a cathode follower section. This is a tube stage where the output is taken from the cathode rather than the plate (essentially across the cathode resistor which is usually grounded on one end). Its main characteristics are a non-inverting gain of one (the cathode is a'followin' the grid) and a low output impedance (that low valued cathode resistor) which means that the "stuff" downstream doesn't affect its output signal nearly as much.
I would suggest (see your last sentence in your last post), as part of this "very educational experience", that you trace the circuit. Then you could post it and we all could see things.
Yeppers! Make sure that the amp has been turned off for at least an hour (you don't want me to start calling you "Sparky").
Remember, something (or someone) is always the fuse.
Heh, heh, another victim, er, uh, ok, yeah victim caught "in the web", eh Boris? ;D ;D ;D ;D
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