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Post subject: Symposium: Creating a Superior High Pass Circuit
Posted: Sun Sep 07, 2014 4:48 pm
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Rock Star
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Ironically, I don't use high pass circuits myself but due to their immense popularity, admittedly, I have become intrigued. Who knows? If we can get it right, maybe I'll reconsider. To wit:

I've been analyzing for the last couple of hours if there is such a thing as a 'perfect' high pass circuit (popularly and erroneously called a treble bleed circuit). My aim is to find some sort of happy medium where the tone pot doesn't typically interact as an AUDIBLE volume pot when the volume pot itself is lowered and, where the volume pot doesn't taper erratically once such a circuit is installed.

My conclusions at this point is that perfection (or super close to it) cannot be achieved. However, I'm somewhat satisfied with my findings in the sense that a nominal amount of incursion can be realized. As of this typing, I have concluded that essentially, a modest output single coil pickup doesn't need, nor does it gain anything by inserting a high pass circuit. For those circuits where 250K alpha pots are appropriate, if you must, a 125K resistor (or as close to it as realistically possible) and a cap within a range of .001uF to .002 uF (or as close as realistically possible), wired in series is the most efficient. Where 500K alpha pots are concerned, a 250K resistor (or as close to it as realistically possible) and a cap within the same range as above wired in series is the most efficient. Notice in both cases, the resistors' value is half the value of the pot. I arrived at these numbers independently and coincidentally.

Of note: IMO, 1000K ohm or megohm pots should not be in a guitar's circuit at all; nor do I see any reason for 300K ones either. Consequently, I haven't 'gone there'. YMMV.

For those of you who have HANDS ON experience in this area, I'd really like to have your input. Please avoid using the so called, "50s Wiring" and/or one type of cap construction vs. another as universal 'cure-alls'. Surely, they are not and both are intrinsically irrelevant to this symposium. This is strictly about trying to create superior high pass circuits which won't make the rest of the circuit they are in audibly suffer.

Discuss!

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Post subject: Re: Symposium: Creating a Superior High Pass Circuit
Posted: Thu Jun 01, 2017 4:39 am
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Amateur
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Joined: Thu Mar 23, 2017 9:30 pm
Posts: 112
What r u talking about anyway ?

250 kOhm for single coils,
500 for HB's, no mystery.

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Post subject: Re: Symposium: Creating a Superior High Pass Circuit
Posted: Thu Jun 01, 2017 6:18 am
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Rock Star
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Location: New York
A little more information:

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