Anyone has the Seymour Duncan and Dimarzio circuit diagrams of their active pups?
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Anyone know the circuits in the Seymour Duncan and Dimarzio active pups?
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It would be possible to describe everything scientifically, but it would make no sense; it would be without meaning, as if you described a Beethoven symphony as a variation of wave pressure. — Albert Einstein
http://coneyislandguitars.com
www.soundcloud.com/davidravenmoon
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Originally posted by David Schwab View PostDiMarzio doesn't make any active pickups. I have no idea what's in the Duncans, but this is supposed to be an EMG 81.
[ATTACH=CONFIG]15971[/ATTACH]
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Our preamp is not like the EMG. If you want ours though, you can buy the Blackouts Modular Preamp. It essentially contains our neck and bridge preamp. The Blackouts Modular Preamp
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Originally posted by frankfalbo View PostOur preamp is not like the EMG. If you want ours though, you can buy the Blackouts Modular Preamp. It essentially contains our neck and bridge preamp. The Blackouts Modular Preamp
T"If Hitler invaded Hell, I would make at least a favourable reference of the Devil in the House of Commons." Winston Churchill
Terry
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Originally posted by frankfalbo View PostYeah of course. The pot has it's own dedicated terminal for in and out. It doesn't prewire the signal into the pot. So you just jump one preamp out directly into the volume pot, and the other over to the other volume pot.
So I would like to try one with some vintage type Strat coils.
I run 5.8k, 6.1k, and 6.5k, N,M,B.
Do you have any sound clips similar to that?
To me that makes a lot more sense to incorp. with the blackout than just the plain ol Liberator.
T"If Hitler invaded Hell, I would make at least a favourable reference of the Devil in the House of Commons." Winston Churchill
Terry
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Bear in mind the preamp is intended to act like a humbucker in itself. The signal from one coil comes in out of phase and is inverted when summed, thus cancelling more hum. A single coil wired into one half of the preamp will hum. Also one of the coils is loaded. So pretend one coil has a low value pot on it. It's darker sounding than the other one. Together it makes up the expected sound, but separately only one of the coils (represented by the white wire in our schematic) is "flat" sounding.
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Originally posted by frankfalbo View PostBear in mind the preamp is intended to act like a humbucker in itself. The signal from one coil comes in out of phase and is inverted when summed, thus cancelling more hum. A single coil wired into one half of the preamp will hum. Also one of the coils is loaded. So pretend one coil has a low value pot on it. It's darker sounding than the other one. Together it makes up the expected sound, but separately only one of the coils (represented by the white wire in our schematic) is "flat" sounding.
I know Nothing on the Subject.
Sorry
T"If Hitler invaded Hell, I would make at least a favourable reference of the Devil in the House of Commons." Winston Churchill
Terry
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Originally posted by frankfalbo View PostOur preamp is not like the EMG. If you want ours though, you can buy the Blackouts Modular Preamp. It essentially contains our neck and bridge preamp. The Blackouts Modular Preamp
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Originally posted by frankfalbo View PostBear in mind the preamp is intended to act like a humbucker in itself. The signal from one coil comes in out of phase and is inverted when summed, thus cancelling more hum. A single coil wired into one half of the preamp will hum. Also one of the coils is loaded. So pretend one coil has a low value pot on it. It's darker sounding than the other one. Together it makes up the expected sound, but separately only one of the coils (represented by the white wire in our schematic) is "flat" sounding.
But for single coil Blackout, you only have one coil, there will be no cancelling no matter how you play with the preamp. It that true then that the single coil Blackout has hum like any other single coil?
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Originally posted by frankfalbo View PostBear in mind the preamp is intended to act like a humbucker in itself. The signal from one coil comes in out of phase and is inverted when summed, thus cancelling more hum. A single coil wired into one half of the preamp will hum. Also one of the coils is loaded. So pretend one coil has a low value pot on it. It's darker sounding than the other one. Together it makes up the expected sound, but separately only one of the coils (represented by the white wire in our schematic) is "flat" sounding.
When you load the two coils differently, you lose the cancellation of the higher harmonics. In environments with a lot of buzzing from, for example, high current switching such as light dimmers, this can be a problem. I have been surprised that designers are willing to lose some hum rejection, especially when active circuits are involved, since it seems just a matter of frequency response that can be achieved easily by other means in an active circuit. However, when you consider the string sampling issue, altering the gain of one coil at the higher frequencies can partially prevent the cancellation of higher string harmonics on the wrapped strings. This could be part of the reason for the popularity of making the coils with different responses.
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Originally posted by Alan0354 View Post...for single coil Blackout, you only have one coil, there will be no cancelling no matter how you play with the preamp. It that true then that the single coil Blackout has hum like any other single coil?
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Originally posted by Mike Sulzer View PostThis is somewhat confusing. "Humbucker" implies the cancellation of magnetic fields, mostly of electrical power line origin, thus 60 Hz and harmonics. A preamp does not do that; coils that detect the interfering fields with opposite polarity are required. However, you can in addition cancel hum from electrical fields by using a differential amplifier. I assume that this is what you are doing, as I believe EMG does.
Originally posted by Mike Sulzer View PostWhen you load the two coils differently, you lose the cancellation of the higher harmonics. In environments with a lot of buzzing from, for example, high current switching such as light dimmers, this can be a problem. I have been surprised that designers are willing to lose some hum rejection, especially when active circuits are involved, since it seems just a matter of frequency response that can be achieved easily by other means in an active circuit. However, when you consider the string sampling issue, altering the gain of one coil at the higher frequencies can partially prevent the cancellation of higher string harmonics on the wrapped strings. This could be part of the reason for the popularity of making the coils with different responses.
The preamp is quiet. The resonant peak of a coil is pretty narrow, and narrowest at the peak. The at rest noise received within the peak area is not proportionately reduced by the amount the dB reduction the peak undergoes in the loaded coil. One way to think of this is that if the resonant peak of a coil was responsible for substantially more noise than the surrounding frequencies, the self noise of a single coil would be dominated by peak frequency of the coil. That's not how we hear it. In other words, you'd see a meaningful spike in noise at the peak frequency. It's just not really an issue. You don't "lose the cancellation of higher harmonics" as you say. You may affect it, but you do not lose it. That's where I say it is not proportionate. An 8dB flattening of the peak does not equal an 8dB increase in noise in the shape of the gap between the two peaks.
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EMG say they also load each coil differently.It would be possible to describe everything scientifically, but it would make no sense; it would be without meaning, as if you described a Beethoven symphony as a variation of wave pressure. — Albert Einstein
http://coneyislandguitars.com
www.soundcloud.com/davidravenmoon
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