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Old 2nd October 2006, 09:38 AM   #1
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Default How to get more juice out of this shunt regulator

Hi chaps

I've breadboarded this shunt regulator. I want to use it to power an active crossover that needs 60mA per channel. So far it works fine to deliver 20mA, but when I use it for higher currents it doesn't work. I'm obviously pretty clueless about how regulators work, so can anyone tell me exactly what I need to do to increase its current capability?

Cheers. Doug
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Old 2nd October 2006, 12:52 PM   #2
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When you say "it doesn't work", what does it do? I think your 2k7 resistor is too high to deliver 60mA. Try 1k and see if it works. (If your problem is the TL431 and associated network, then I can't help because I don't know the device.)
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Old 2nd October 2006, 01:06 PM   #3
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Agree. There's about 130V spare across that 2.7k. 60 mA takes away all of it and more. Ohms law. Lower it to 1k as suggested. Hopefully your transgformer & rectifier & filter can accomodate the (2 x) 60mA, if they drop then your 1k is still too high.

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