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[AMPS] Filament voltage inrush

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Subject: [AMPS] Filament voltage inrush
From: (Steve Thompson)
Date: Fri, 5 Feb 1999 09:01:07 +0000
In message <>, frank ayers
jr <> writes
>There has been a bit of discussion recently about resistors in series with
>the primary of fil xfrmrs. What about the use of the thermistor gizmos? As
>I understand it, they start out around 50 ohms then drop down as they heat
>up. Anybody have any idea how well these would work for inrush protection?
If you are using a primary side resistor to control the load voltage, it
needs to be a stable, fixed value (assuming your incoming line is stable
voltage). The inrush thermistors do a great job on inrush - I've added
them to a number of bench supplies here and the lights don't flicker
anymore. I wouldn't recommend them on a supply where the output isn't
stabilised - they are likely to mess up the output regulation.


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