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LM317 calculator for filament circuit

cbj591

Member
2010-05-08 7:58 pm
Good afternoon all,

I was looking at a couple of LM317 calculators for R1 and R2.

Question. Is the VOut given in these calculators the voltage drop from the input voltage or the actual voltage output.

The Toroid tranny I have has a 17.8v tap so I was a little confused on what the calculator VOut giving.

Any help would be grateful

Cheers
Brian
 

M Gregg

Disabled Account
2010-06-28 11:04 pm
UK
Good afternoon all,

I was looking at a couple of LM317 calculators for R1 and R2.

Question. Is the VOut given in these calculators the voltage drop from the input voltage or the actual voltage output.

The Toroid tranny I have has a 17.8v tap so I was a little confused on what the calculator VOut giving.

Any help would be grateful

Cheers
Brian

If you can give us a link to the calculator it will be easier to comment!:)
 

cbj591

Member
2010-05-08 7:58 pm
Then what input voltage is it basing the output on?

You can play with the R! and R2 values and get different output voltages. Example if my input was 17.8?

Not trying to be dim, just not getting the concept on how it knows the output without a given input.

thanks