r-combine
Combines resistor values you have to (hopefully) obtain resistance values you don't have, by combining them in parallel pairs.
Input data
Put a list of values you DO have in a stock file called
r-combine.stock. KMGT SI suffixes are accepted. Decimal values are
currently not, so write 7500 instead of 7.5k. Yes, this sucks.
10
100
1k
10k
100k
1m
Usage
Just pass the values you want to find combinations for on the commandline. For example:
$ perl r-combine.pl 910 1k 5k 9100 91000 | grep -v reject
r-desired 910 candidate r1 1k r2 10k result 909
r-desired 910 candidate r1 10k r2 1k result 909
r-desired 1000 exact match found in stock
r-desired 5000 candidate r1 10k r2 10k result 5000
r-desired 9100 candidate r1 10k r2 100k result 9090
r-desired 9100 candidate r1 100k r2 10k result 9090
r-desired 91000 candidate r1 100k r2 1m result 90909
r-desired 91000 candidate r1 1m r2 100k result 90909
Bugs/ideas
All entirely fixable/possible but I am lazy and this works enough for my purposes.
- each candidate is shown twice
- decimal stock entries (eg. 7.5k) don't work, use eg. 7500 instead
- option to disable showing rejects
- option to use a whole E12/24/48/96 series instead of a stock file