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Old 16th May 2010, 06:44 PM   #1
phrarod is offline phrarod  United States
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Default Need super quiet 6.3V filament supply schematic

Anyone have a schematic for super quiet 6.3v filament supply? Much appreciated. 1A per tube should be plenty.
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Old 16th May 2010, 07:04 PM   #2
Zen Mod is offline Zen Mod  Serbia
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make CCS ;

or even better - heater between gyrator and CCS

in case that's indirectly heated tube , don't forget to elevate heater at least 35V above cathode potential
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Old 16th May 2010, 07:06 PM   #3
phrarod is offline phrarod  United States
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I've been hearing a lot about CCS lately. Do you have a schematic or reference URL?

Gyrator?
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Old 16th May 2010, 07:17 PM   #4
Zen Mod is offline Zen Mod  Serbia
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New DHT heater


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Old 16th May 2010, 08:45 PM   #5
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The easiest CCS is built with an LM317 regulator. Page 18 of the datasheet has an example. http://www.national.com/ds/LM/LM117.pdf

The L200 chip is good for more current but slightly more complex. http://www.st.com/stonline/books/pdf/docs/1318.pdf
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Old 16th May 2010, 09:39 PM   #6
Matt BH is offline Matt BH  United Kingdom
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Quote:
Originally Posted by Zen Mod View Post
make CCS ;

or even better - heater between gyrator and CCS

in case that's indirectly heated tube , don't forget to elevate heater at least 35V above cathode potential
These are good points. Why do you need a low noise heater supply? are you getting noise troubles because of the inherent diode between heater/cathode? (assuming indirectly heated)

If you really need low noise then the constant current designs in the datasheets Astouffer posted are the way to go. Nice and gentle on the heaters too.
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