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Inductor coils?

How would one go about determining the milihenries value of an inductor coil pulled from an amplifier, well different ones I have found. And living up to it's standards, google has found me no information but what an inductor coil is and it's function, but no information on how to find inductance rating.

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Big Bwana9 years ago
Is it physically damaged, like run in with a naughty wire cutter coming to collect money and it refused to pay up, so leg got cut off here and there ?? It's rare to damage them and if it's the inductor I'm thinking it is ?? it's on the output side and you could just by pass it with a jumper wire if it is broke... (( got pic of it ?? ))
Punkguyta (author)  Big Bwana9 years ago
I cut them off right at the solder joints, I know I probably should have unsoldered it, but unfortunately my 30W soldering pencil sucks. Picture above.
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Is this off a 12 Volt amp ?? because that looks like a switched mode transformer is more then likely is very amplifier specific and altering them will have huge effects on an amp, it controls the input voltage, output voltage and some also set the oscillation of the whole circuit... So I would only use the one for your amp and it's not common for them to fail and if they do your almost better to rewind it exactly like it was wound (( They can be pain to buy )) If your having a problem soldering or de-soldering them try using a propane torch with a small flame and keep it moving around all the pins so you don't burn the board, and hold the PCB upside down and it should just drop out when ready.......
Punkguyta (author)  Big Bwana9 years ago
>Is this off a 12 Volt amp ?? because that looks like a switched mode transformer is more then likely is very amplifier specific and altering them will have huge effects on an amp, it controls the input voltage, output voltage and some also set the oscillation of the whole circuit... . Yea it's off a dead car amplifier I was given, I'm not really looking to fix the amp itself, but was rather looking to see if it was the right kind of coil to connect in line with my subwoofer to a normal 2 channel stereo I have here for short term fix until I get a new amp for the sub. I just need a crossover point of around 30-40hz
Punkguyta (author)  Punkguyta9 years ago
Oh yeah, forgot you can make notes on the pics in a reply. You'll see there that theres a pair of two strands in the first picture, they wrap around a few times and in the other pictures you'll see the single pair of wires that are seperate, they seem to wrap around a few more times but it's very difficult to tell because the separate strands overlap each other's paths so I can't even count it.
Sandisk1duo9 years ago
well, you can get multimeter that measures inductance

or if you hav ean ociliscope, you can go to this website

oh, if you just need an inductor, for a project, here is a link for FREE samples, be sure to keep in mind that they WILL call you
Punkguyta (author)  Sandisk1duo9 years ago
ooo a free sample site? Awesome, I'd be up for calling them myself if it'll be free. I don't have an oscilloscope so that's out of the question, however that would most likely probably be my best bet.
Have you readthis instructable? Integrated Circuits are the easiest to obtain, because no one calls you. I have this many ICs _ _
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Try ordering a set of nice snap in caps from Panasonic if you want them to call and then visit .... (( and this idea of a rep coming to visit scares the hell out of most but don't worry the rep will load you down with all sorts of good stuff you need but really will play with, I got blue LED's a remote controlled relay board a bunch of other caps a few LCD, some switches a few feet of heavy duty heatsink )) And a good tip is don't put on a tie and try to look all business like, most electronic design engineers wear jeans and t shirt and some even live in there mother's basement ... and show them what your building this is how you find out that most companies sample items that complement your design, I got the heat sink because the rep said the one I have chosen wasn't good enough so he had to do better, wish I knew this before I bought that one ..... They even called the factory paid engineers who did the math to back up there claims .... I just give you the heads up of who I know will call so you know either your willing to deal with a rep or if you just want to buy it ...
I'm under-aged at 14, so, um ya, i won't pass off as an engineer
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