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Post subject: Re: Kong's Sherwood Green Tele Build (FInished)
Posted: Sun Jan 23, 2011 1:46 pm
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Kong wrote:
Andy, 1 big question. I ran down to radio shack and they have the 270K resistors in 1/8, 1/4 and 1/2 watt options. Which would be correct for a guitar circuit? I have no idea.

Here is a link to the diagram I am using as a model. I am only really using this diagram for the resistor and the ground wire, otherwise I'm still following your original diagram but changing to 500K pots.

http://support.fender.com/service_diagr ... A_SISD.pdf

I'm very interested in your thoughts on this, Andy.

thanks
~Kong

Howdy!

For your resistor the 1/8 watt would be best. There's such a small amount of current generated in a guitar so no need for the big ones (though they do look cooler!)

Quite jealous at the mo! Really wish I had a Telecaster as I quite fancy trying out a few things myself!

Good luck! :D

Andy

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Post subject: Re: Kong's Sherwood Green Tele Build (FInished)
Posted: Sun Jan 23, 2011 2:07 pm
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Kong wrote:
... They are all using 500K pots. They also show a 270K resistor from the switch where the bridge pickup wire is connected to the volume pot, and a ground wire from the volume pot to a lug in the bottom of the control cavity. I'm thinking of changing the pots to 500K, adding the resistor and the ground wire...

~Kong


If I may interject here, Kong, this is what I was explaining to you when I saw you for your Strat. The exception being, I said to use a 470K resistor where any wattage is fine but the higher the rated wattage, chances are, the better made the resistor.

Again, what's going on with the resistor is this: With the subject circuit you've referenced, that resistor makes the bridge pickup 'see' a 192.5K ohm volume pot instead of a 500K one. If you remember, I stated that a 470K resistor is the closest commercially available which when wired as your subject diagram has it, will make your bridge pickup 'see' a 245K pot which is best all around for the single coil as it is closest to a 250K and that .05K deficit is virtually undetectable.

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Post subject: Re: Kong's Sherwood Green Tele Build (FInished)
Posted: Sun Jan 23, 2011 2:14 pm
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Thanks again Andy. I'll make the changes this week and see if there is any positive effect. By the way with your woodworking skills as evident in you Big Hairy Tone-Caster, you could route out a nice Tele in no time. As I said earlier in this thread I'm thinking of doing a natural Tele in Pine from scratch. For my first scratch build, I really am shying away from a strat with all those contours.

Also, just wanted to say thanks again to all the kind words from everyone who took the time to post. I really appreciate the compliments and nice comments. I'm looking forward to sharing more projects with this group as I learn. It is only through what I've mostly learned here that I could even attempt any of this stuff.

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Post subject: Re: Kong's Sherwood Green Tele Build (FInished)
Posted: Sun Jan 23, 2011 2:26 pm
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Martian wrote:
Kong wrote:
... They are all using 500K pots. They also show a 270K resistor from the switch where the bridge pickup wire is connected to the volume pot, and a ground wire from the volume pot to a lug in the bottom of the control cavity. I'm thinking of changing the pots to 500K, adding the resistor and the ground wire...

~Kong


If I may interject here, Kong, this is what I was explaining to you when I saw you for your Strat. The exception being, I said to use a 470K resistor where any wattage is fine but the higher the rated wattage, chances are, the better made the resistor.

Again, what's going on with the resistor is this: With the subject circuit you've referenced, that resistor makes the bridge pickup 'see' a 192.5K ohm volume pot instead of a 500K one. If you remember, I stated that a 470K resistor is the closest commercially available which when wired as your subject diagram has it, will make your bridge pickup 'see' a 245K pot which is best all around for the single coil as it is closest to a 250K and that .05K deficit is virtually undetectable.


Great information Martian, thanks again! I will definitely use a 470K resistor based on your excellent explanation. When I saw the diagram I referenced, I reasoned that it was close to what you were explaining to me a few months ago. I am a neophyte when it comes to electonics and circuits, but I don't feel that learning will be as hopeless as I once thought. Any conjecture why Fender wouldn't just use a 470K resistor as a stock option since it gets you so close to a virtual 250K pot value? Also if it is not too complicated, can you share the formula where a 470K resistor gets your bridge pickup to see a 245K pot and a 270K resistor gives you a 192.5K pot? I'd love to be able to figure some of this stuff out!

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Post subject: Re: Kong's Sherwood Green Tele Build (FInished)
Posted: Sun Jan 23, 2011 5:53 pm
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Kong wrote:
Great information Martian, thanks again! I will definitely use a 470K resistor based on your excellent explanation. When I saw the diagram I referenced, I reasoned that it was close to what you were explaining to me a few months ago. I am a neophyte when it comes to electonics and circuits, but I don't feel that learning will be as hopeless as I once thought. Any conjecture why Fender wouldn't just use a 470K resistor as a stock option since it gets you so close to a virtual 250K pot value? Also if it is not too complicated, can you share the formula where a 470K resistor gets your bridge pickup to see a 245K pot and a 270K resistor gives you a 192.5K pot? I'd love to be able to figure some of this stuff out!


You're welcome.

I'm answering your questions in reverse as it will answer them more logically.

With most components wired in series, you add the total value of the components in the load. For example, if you have two pickups wired in series where each pickup's DC resistance value is 6.20K ohms each, you wind up with a total ohm load of 12.40K. If they were wired in parallel, again, a typical guitar's circuit, you take the total sum of the load (in this case, 12.40K and divide it by 4, thus, the parallel load is 3.10K.

Now, look at a 500K ohms volume pot load. Inserting a 470K ohm resistor (again too, the closest value readily available) in parallel with the volume pot gives you a load of 242.5K ohms. Right here you are in the 'ballpark' of 250K ohms where the resistance difference is negligible and in accordance with what is right and proper for a single coil Tele bridge pickup.

I honestly can't figure out Fender's logic aside from them wanting the bridge pickup to 'see' a really low resistance reading on the volume pot which would make the pickup sound quite gritty by ramping up its midrange which in turn, would give it some 'teeth' in an effort to make it better hold its own with a full sized HB.

You may say, "What about the tone pot's resistance in the circuit?". Oversimplified, the way a tone pot is wired in a typical guitar's circuit, its inherent resistance in the circuit while on '10' is marginal until you start dialing down on it and even at this, the progressive resistance in team with the capacitor affects the tonal coloring of the pickup moreso than any perceived shift in the inherent frequency properties of the pickup itself.

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Post subject: Re: Kong's Sherwood Green Tele Build (FInished)
Posted: Mon Jan 24, 2011 8:22 pm
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Based on the latest info from Martian and Andy I was able to sort out quite a bit on the Tele tonight. It sounds and plays amazingly now. I know I still need to put up a sound clip or two and I'll get those up this week.

Anyhow, when Martian mentioned strange vibrations in the bridge assembly during the wax potting discussion I thought I'd better go back and check the bridge screws. I think there was a minute amount of play in the bridge and I tightened the screws as tightly as possible. When I plugged the guitar in I noticed that the sympathetic vibrations were a lot less pronounced than before.

I still was not thrilled with the sound after just tightening the bridge screws even though there had been some improvement. The humbucker was just stuck in the muck so to speak. So I went ahead with the plan to re-wire the guitar with the 500K pots the 470K resistor. I also fixed it so that the 'bucker's coil is tapped when the switch is pulled. I made the changes and buttoned everything back up and WOW. The humbucker sounds amazing on its own now. When I select both pickups, it sounds very nice with a bit of grit, but when I split the coil it sounds amazing on a clean setting. The bridge pickup on its own is clear and bright and twangs like a Tele should. I have a feeling this is going to be my favorite guitar in time.

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Post subject: Re: Kong's Sherwood Green Tele Build (FInished)
Posted: Mon Jan 24, 2011 8:28 pm
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Got it all fixed Kong? That's great news! I little bit of perseverance has paid off!

Can't wait to hear this one in action (and maybe it's matching brother? :D). I'm thinking something along the lines of this:

http://www.youtube.com/watch?v=uAJjyQU2tcM

"When a man loves a sherwood green coloured tele...."

Dan

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Post subject: Re: Kong's Sherwood Green Tele Build (FInished)
Posted: Mon Jan 24, 2011 8:44 pm
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Impulse7 wrote:
Got it all fixed Kong? That's great news! I little bit of perseverance has paid off!

Can't wait to hear this one in action (and maybe it's matching brother? :D). I'm thinking something along the lines of this:

http://www.youtube.com/watch?v=uAJjyQU2tcM

"When a man loves a sherwood green coloured tele...."

Dan


Hey Dan, that sounded good, we'll just have to line up Arlen Roth to play my Tele, because I don't think I could pull that one off.

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Post subject: Re: Kong's Sherwood Green Tele Build (FInished)
Posted: Tue Jan 25, 2011 5:23 pm
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Hi Kong,

Glad everything worked out in the end! Some top stuff from Martian there. :D

Rock on!

Andy

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Post subject: Re: Kong's Sherwood Green Tele Build (FInished)
Posted: Tue Jan 25, 2011 7:20 pm
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Andybighair wrote:
Hi Kong,

Glad everything worked out in the end! Some top stuff from Martian there. :D

Rock on!

Andy


Thanks, Andy!

Kong, I'm glad you're now satisfied. Enjoy!

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