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Software for calculating combinations of resistors


I was recently thinking about building a resistance substitution box,
but I could not find all the values I needed in 1% parts.

I wrote two programs, one of which calculated combinations of 
resistors in serial, and another that calculated combinations of
resistors in parallel.

You provide a list of the values you have, and the values you 
would like to create. The program then tries combinations of
resistors to create all your target values.

This is really handy when you can't find a resistor value you want,
and is much easier than trying to guess combinations that will suit
your purposes.

If anyone is interested, I am happy to provide the source code
on request. If  you don't have access to a C compiler, ask me 
and I will try to get you a compiled version for your platform.