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#1 |
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diyAudio Member
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Hello everybody,
In multi speaker situation sometimes we can made a mistake to place a loudspeaker wire. I have seen some people use a pulse based polarity checker system but I have search around without a result. any body have idea how to build this checker ? |
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#2 |
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diyAudio Member
Join Date: Sep 2005
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How about a low voltage low current source like a watch battery connected between the terminals, then note if the cone moves forward or backwards?
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#3 | |
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diyAudio Member
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Quote:
I use a 1.5V or 9V battery. |
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#4 |
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diyAudio Member
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How about a low voltage low current source like a watch battery connected between the terminals, then note if the cone moves forward or backwards?
Thats not a problem if you can see the driver but if you cant see it like in bandpass or horn. thats procedure will gets dificulties |
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#5 |
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diyAudio Member
Join Date: Feb 2004
Location: Stockholm
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Run my tone generator with a sawtooth wave and record the sound with a microphone and look at it with my spectrum analyzer (which also shows the waveform).
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#6 |
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diyAudio Moderator
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The sawtooth wave is a most excellent method to check polarity. I use it all the time.
The pulse checkers you are talking about are common in pro sound. You should ask at a music or PA store. I've never seen one in kit form, but there might be one.
__________________
Take the Speaker Voltage Test! |
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#7 |
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diyAudio Member
Join Date: May 2004
Location: Vancouver Island
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Elektor Magazine published plans for such a thing, "Phase Check for Audio System", probably in #11 1990. It's also in the book"Build Your Own High-End Audio Equipment".
There's a transmitter box that generates pulses (line and mic level, and audible (if you add a little speaker), and a detector box that works with a built-in microphone or line inputs. I built a set, and it worked. You could probably generate the pulses using an audio editor and burn a CD, which could save building the transmitter box. It might be on one of the Elektor audio project CD-ROMs, or if you ask a librarian nicely you might be able to get the book through an inter-library loan, or a copy of the magazine article. |
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#8 |
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diyAudio Member
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Thanks for any sugestion I have found The schematic that I looking for from rolls, PT102 thats exactly that I looking for
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#9 |
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diyAudio Member
Join Date: Feb 2010
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#10 |
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diyAudio Member
Join Date: Nov 2005
Location: Norway
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Hi,
If you also want to check the polarity of your mic, have a look here: Build a Microphone Polarity Tester I am using the circuit in fig 2. I guess this circuit also can be used for checking the polarity on a driver. best, Paal |
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