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Groups > comp.soft-sys.math.maple > #934

Spice Question

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How do I form, solve

## syrup example for the problem posed on the maxima mailing list
## by Rupert Swarbrick rswarbrick@gmail.com
## creating a shunt to measure current from a power supply in decade
## steps.
## the maxima solution is:
##  (%o49) [r1 =   0.04000003980823639,r2 =   0.400003980860735,
##          r3 =   4.000398123173552,  r4 =   40.03984945656259,
##          r5 = 404.0224806732696,    r6 = 4444.219040588743]
restart; with(Syrup);
r_isol:=100000;
ckt:="*Shunt by Rupert Swarbrick \n\
V 1 2 1 \n\
R1 1 2 \n\
Ra 1 3 r_isol \n\
Rb 2 4 r_isol \n\
R2a  3 21 r_isol \n\
R2  21 22 \n\
R2b 22  4 r_isol \n\
R3a  3 31 r_isol \n\
R3  31 32 \n\
R3b 32  4 r_isol \n\
R4a  3 41 r_isol \n\
R4  41 42 \n\
R4b 42  4 r_isol \n\
R5a  3 51 r_isol \n\
R5  51 52 \n\
R5b 52  4 r_isol \n\
R6a  3 61 r_isol \n\
R6  61 62 \n\
R6b 62  4 r_isol \n\
.end";

I tried using a subckt for the R2..R6 parts.
##
## X2 3 4 net(Rx=R2) \n\
## X3 3 4 net(Rx=R3) \n\
## X4 3 4 net(Rx=R4) \n\
## X5 3 4 net(Rx=R5) \n\
## X6 3 4 net(Rx=R6) \n\
## \n
## .subckt net p n \n\
## R1 p a r_isol \n\
## R a b Rx \n\
## R2 b n r_isol \n\
## .ends net \n\

Is this correct, other than being commented out?

Tom Dean

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Spice Question "Thomas D. Dean" <tomdean@speakeasy.org> - 2014-08-30 14:35 -0700
  Re: Spice Question Joe Riel <joer@san.rr.com> - 2014-08-30 17:15 -0700
    Re: Spice Question Joe Riel <joer@san.rr.com> - 2014-08-30 17:18 -0700
    Re: Spice Question "Thomas D. Dean" <tomdean@speakeasy.org> - 2014-08-30 23:44 -0700
      Re: Spice Question Joe Riel <joer@san.rr.com> - 2014-08-31 08:02 -0700
        Re: Spice Question "Thomas D. Dean" <tomdean@speakeasy.org> - 2014-09-01 21:22 -0700

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