gear to scavenge. building a crossover |
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Bams
Young Croc Joined: 08 April 2009 Status: Offline Points: 622 |
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Posted: 20 March 2020 at 11:40am |
So here you are.. a quarantine with no end in sight, a load of acceptable drivers and wood, websites enough with calculators but no components for crossovers.. any oldtimers who can tell which unused gear to scavenge for coils and so on?
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Elliot Thompson
Old Croc Joined: 02 April 2004 Location: United States Status: Offline Points: 5172 |
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I usually use parts stemmed from Power Supplies used in old desktop computers when I need a quick passive crossover. Best Regards,
Edited by Elliot Thompson - 20 March 2020 at 12:03pm |
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Elliot Thompson
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studio45
Old Croc Joined: 16 October 2007 Location: United Kingdom Status: Offline Points: 3863 |
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+1 to what Elliot said - power supplies are where you want to look for them THICC components For inductors, you're not likely to find anything over 1mH, wound with decently thick wire, anywhere but in an actual crossover - but, there's a lot of wire in transformers, so look at hacking those apart, and rewinding the thick secondary wire onto another former. Input/output chokes on SMPS are sometimes quite beefy, might just be about the right value for a tweeter crossover? Not usually large values though as they're there to filter out remnants of a 100kHz+ switching frequency, not our <20kHz audio range. The big white 25 and 50 watt ceramic power resistors are not very common, but smaller 5 watt types can be found in power supplies. Again if you parallel them you can add up the wattages, but remember resistors don't really mind running red-hot, at least until the solder melts ;) I'd reccommend getting one of the "Transistor Tester" multi-component analysers, if you're building from salvage - much less fiddly than a normal probe multimeter for checking the values of stuff as you pull it out.
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Studio45 - Repairs & Building Commotion Soundsystem -Mobile PA
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madboffin
Old Croc Joined: 03 July 2009 Location: Milton Keynes Status: Offline Points: 1537 |
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Scrap electric motors can be a good source of enamelled copper wire (also known as "winding wire" or "magnet wire") for making inductors.
A few years ago I would also have suggested CRT video monitors (for the scanning coils) but they've probably all long gone to landfill... Edited by madboffin - 20 March 2020 at 3:00pm |
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service dept Steve
Old Croc Joined: 30 January 2010 Location: S.W.London Status: Offline Points: 2034 |
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Fluorescent light fittings usually yield a largish value bi polar capacitor or two.
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We are not "They", We are "The others"http://www.servicedept.co.uk -
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Bams
Young Croc Joined: 08 April 2009 Status: Offline Points: 622 |
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This is why i love speakerplans! that's up to the attic for me then.
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