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optimizing constant current heater supply

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kasra

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Joined 2001
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Im looking for suggestions on how I can tweak my constant current heater supplies for the better.

They look like this today:
7VAC --> rectifier --> 2200uF+0.1uF --> LM regulator --> 2200uF+0.1uF --> 417a.

For example ive been suggested to center the ground potential to by divideing with 2x100k.

Are there other tweaks i can look into?
 
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