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RE: Need an overview to replace fixed voltage reg with adjustable voltage reg,

100R is probably as low as I'd choose for R1. The formula is:

R2 = (V-out/1.25) - 1

Thus, for R1 = 100R and V-out = 15v, R2 = 1,320 ohms (1k3)
And, for R1 = 120R and V-out = 15v, R2 = 1,100 ohms (1k1)

Ah, the joy of spreadsheets.


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