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Low Pass Filter by twisting pickup wires.

 
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Toleolu



Joined: 06 Apr 2011
Posts: 524
Location: Hawaii USA

PostPosted: Tue Oct 31, 2017 9:05 am    Post subject: Low Pass Filter by twisting pickup wires. Reply with quote

Since I can't really find anything on this subject online, it may very well be a moot point, but it never hurts to ask, right??

Basic electronics teaches us that when you twist two insulated wires together, you're creating a circuit (back in the day we called it a capacitive tank) that based on number of variables, will pass certain frequencies, while at the same time, blocking others.

One of those variables, and like I said, there are a number of them, is the number of twists in the wires. Is there any kind of spec or rule of thumb out there on the number of twists to put in pickup wires that will provide optimal efficiency in passing frequencies in the audio range?
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Lon



Joined: 30 Dec 2003
Posts: 6086
Location: Stephenville, TX

PostPosted: Tue Oct 31, 2017 8:29 pm    Post subject: Reply with quote

The only thing that I know when twisting pairs, is the wire length needs to equal. This decreases the hum caused by electromagnetic field in the wires, which cancels each other out. It also decreases the RF interference in single coil pickup system, which is big antenna. The use of shielded wires doesn't make much more difference than twisted pairs

The use twisted pairs were/are used in the early days in phone lines and amp building, mostly to the preamp tubes. The number of turns for given length and given frequencies passed, I don't know about those conditions. I guess testing the theories with an o-scope and equipment would be required
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Toleolu



Joined: 06 Apr 2011
Posts: 524
Location: Hawaii USA

PostPosted: Wed Nov 01, 2017 7:46 am    Post subject: Reply with quote

I think it's one of those diminished returns type of things. Looks good in theory, but just too many variables in getting it right.

Still going to keep putting twists in the pickup leads though.

Thanks
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marksound



Joined: 15 Aug 2005
Posts: 16669
Location: OKUSA

PostPosted: Wed Nov 01, 2017 1:00 pm    Post subject: Reply with quote

I doubt if it makes any difference, with the short run and minimal voltage. Leo Fender was a radio/amplifier guy, and I've never seen twisted pairs in any of the guitars he designed.
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BrightKJ



Joined: 13 Sep 2008
Posts: 342
Location: Midlothian, VA

PostPosted: Wed Nov 01, 2017 2:01 pm    Post subject: Reply with quote

As an electrical engineer, I can tell you that given the distances, voltages and currents you are talking about, twisting the wires will make no difference. The only thing twisting the wires does is make it look neater.
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