"Standard" EIC power input vs. Filtered EIC - Page 2 - diyAudio
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Old 16th May 2001, 02:30 PM   #11
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Inrush current will typically always be in the 100 amps or more for a good amp. This is not the way to rate your filters ...

Thermistors work great unless you turn off, then almost immediately on, when the thermistors are still hot (but then you would still have some charge on your caps.

Petter
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Old 17th May 2001, 03:56 AM   #12
arnach is offline arnach  United States
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Exclamation Yes!

Use thermistors!
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Old 17th May 2001, 11:31 AM   #13
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Is there a way to choose a thermistor for a given toroid power rating ? I asked once a toroid constructor but he told me they choose it by practice.
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Old 17th May 2001, 01:21 PM   #14
Eric is offline Eric  United States
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Question Thermistor Ratings

I'm curious to know what ratings to choose for a thermistor given a certain transformer size also...
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Old 17th May 2001, 10:27 PM   #15
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Thermistors are the el-cheapo way out. BAT VK60 has 5 ohm version for 110V and 10 ohm version for 220V -- they come in various sizes and get very hot. Why el-cheapo? Because you always have an extra pass element with finite resistance and you also have heat generation, might not work right if power fails, you don't know if it is broken or not (high temp usually means shorter life).

Check out the size on http://www.balanced.com ... compare with Plitron units at http://www.plitron.com.

However, it will vary with type of rectification/filtering and output voltage.

You can buy a resistive kit from http://www.lcaudio.com/tilb.htm -- 330 ohms for 3 seconds, probably OK with half the resistance for US. Nice, I might just get a couple but they are not free.

Petter
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Old 17th May 2001, 10:34 PM   #16
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I still think the easiest way to keep inrush current low on turn on is with in series resistors with a timer relay. There are circuits without transformet or power supply direkt from the mains supply.
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Old 18th May 2001, 09:31 AM   #17
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The easisest and cheapest is thermistor -- a series element, hooks up like a resistor, looks like a ceramic capacitor and does not overheat which a resistor could likely do.

It is not the best, though.
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