360 degree phase switch

Puffin · 10th April 2006, 03:24 PM

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 ?

runebivrin · 10th April 2006, 03:33 PM

Since 360 degrees is equivalent to 0 degrees, I'm not sure what you want. Did you mean a 180 degrees switch?

Rune

sivan_and · 10th April 2006, 03:35 PM

perhaps he meant a continously variable 0 to 360 degrees....

Puffin · 10th April 2006, 06:38 PM

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 ?

xplod1236 · 10th April 2006, 07:56 PM

Yes, this is 180 degrees.

simon5 · 10th April 2006, 08:51 PM

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.

Khron · 11th April 2006, 05:58 AM

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

lndm · 11th April 2006, 11:56 AM

Varying from 0 to 180 then swapping the cable polarity and again varying from 0 to 180 - gives all the possibilities.

runebivrin · 11th April 2006, 02:50 PM

I see.

Have a look at this: Rod Elliott phase controller

Rune

bob123 · 17th April 2006, 02:11 AM

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.

10th April 2006, 03:24 PM	#1
Puffin diyAudio Member Join Date: Feb 2006 Location: U.K	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 ?

10th April 2006, 03:33 PM	#2
runebivrin diyAudio Member Join Date: Jul 2003 Location: Huddinge, Sweden	Since 360 degrees is equivalent to 0 degrees, I'm not sure what you want. Did you mean a 180 degrees switch? Rune __________________ Do wizards use spell checkers?

10th April 2006, 03:35 PM	#3
sivan_and diyAudio Member Join Date: Dec 2004 Location: Dxb / India	perhaps he meant a continously variable 0 to 360 degrees.... __________________ SivanandBalan

10th April 2006, 08:51 PM	#6
simon5 diyAudio Member Join Date: Nov 2004 Location: Québec, Québec	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. __________________ DIYaudio for President !

11th April 2006, 02:50 PM	#9
runebivrin diyAudio Member Join Date: Jul 2003 Location: Huddinge, Sweden	I see. Have a look at this: Rod Elliott phase controller Rune __________________ Do wizards use spell checkers?


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10th April 2006, 06:38 PM	#4
Puffin diyAudio Member Join Date: Feb 2006 Location: U.K	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 ?

10th April 2006, 07:56 PM	#5
xplod1236 diyAudio Member Join Date: Dec 2003 Location: On the couch	Yes, this is 180 degrees.

11th April 2006, 05:58 AM	#7
Khron diyAudio Member Join Date: Jul 2005 Location: Finland	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

11th April 2006, 11:56 AM	#8
lndm diyAudio Member Join Date: Mar 2006 Location: nsw	Varying from 0 to 180 then swapping the cable polarity and again varying from 0 to 180 - gives all the possibilities.

17th April 2006, 02:11 AM	#10
bob123 diyAudio Member Join Date: Jun 2004 Location: Southampton UK	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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