I've  been putting together the components to assemble this battery eliminator shared in an older post by gunrunnerjohn.

Battery_Eliminator_for_Postwar_Horns

Question: Are the values of R1 and R2 set in stone, or could the circuit work with other values?

Thanks,

Samuel Wills

 

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It's the ratio of R2:R1 that's important as per the equation for Vout in your diagram.  I'm assuming your question is from availability of values?  For example it's undoubtedly easier to find 47 and 220 Ohms instead of 50 and 240 Ohms.  47 and 220 will generate the same 1.5V output. 

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