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Old 10th April 2006, 03:24 PM   #1
Puffin is offline Puffin  United Kingdom
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Default 360 degree phase switch

Can you buy a 360 degree phase switch for a subwoofer or do you have to make them ? How would you make such a switch ?
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Old 10th April 2006, 03:33 PM   #2
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Since 360 degrees is equivalent to 0 degrees, I'm not sure what you want. Did you mean a 180 degrees switch?

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Old 10th April 2006, 03:35 PM   #3
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perhaps he meant a continously variable 0 to 360 degrees....
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Old 10th April 2006, 06:38 PM   #4
Puffin is offline Puffin  United Kingdom
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Sorry, perhaps I used the wrong terminology. Basically I want a variable phase switch, a sweep from, in phase to out of phase, is this 180 ?
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Old 10th April 2006, 07:56 PM   #5
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Yes, this is 180 degrees.
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Old 10th April 2006, 08:51 PM   #6
simon5 is offline simon5  Canada
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Hi Puffin, the easy way out is to purchase a plate amplifier for your subwoofer. Some of them got a switch between 0 and 180 degrees and others got a knob for continously variable phase between 0 and 180 degrees.
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Old 11th April 2006, 05:58 AM   #7
Khron is offline Khron  Romania
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I'd also be interested in DIY-ing such a continuously variable phase adjustment. Buyout plate amps aren't really my "thing" (i was thinking of a BPA300 with 6xLM3886), so a separate schematic or circuit diagram would be real nice
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Old 11th April 2006, 11:56 AM   #8
lndm is offline lndm  Australia
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Varying from 0 to 180 then swapping the cable polarity and again varying from 0 to 180 - gives all the possibilities.
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Old 11th April 2006, 02:50 PM   #9
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I see.

Have a look at this: Rod Elliott phase controller

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Old 17th April 2006, 02:11 AM   #10
bob123 is offline bob123  United Kingdom
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In order to have vairable phase you need to have an in phase signal and the same signal 180 degrees out of phase. You then use a potentiometer and a capacitor as a potential divider between the signals. The output from the pot div will vairy between 0 and 180 degrees depending on the variable resistor.

This can be done using transistors or opamps, Transistors are probaly easier as you would only need the one.
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