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 ?
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 ?
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?
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
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
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).
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.
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.
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.
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.
Hi everybody
Thanks for any sugestion I have found The schematic that I looking for from rolls, PT102 thats exactly that I looking for
Thanks for any sugestion I have found The schematic that I looking for from rolls, PT102 thats exactly that I looking for
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
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
I use a battery but one needs to bear in mind that some drivers (some JBLpro and Tannoys for example) move inwards when faced with a positive voltage connected to the positive terminal.
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