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fillament power supply for dht tube

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David Hess:

--- Quote from: scsi on June 22, 2020, 11:06:50 am ---what rectifiers are best to use in this situation, should I do something about ripple filtration and how big C1 and C3 should be?
--- End quote ---

Use a C3 as recommended in the LT1085 application notes.  Typically it will be something like a 10 microfarad solid tantalum or 47 microfarad aluminum electrolytic.

The size of C1 depends on the allowable input ripple voltage and output current.  I usually start with a ripple voltage equal to the dropout voltage and the rule of thumb if 8200 microfarads per amp/volt which comes out to 3500 microfarads so a standard value of 3300 or 4700 microfarads.

Ripple should be about 250 microvolts.

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