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Tim Wescott Wescott Design Services
Do you need to implement control loops in software? "Applied Control Theory for Embedded Systems" was written for you. See details at
Pretty funny. Interesting how Usenet text has always been crystal clear, 5-by-5.
Maybe Sloman can tell us what this circuit does, and what the resistance of the 1 ohm array is. Or perhaps this 666 timer is why the 555 is "obsolete" according to him.
I've just connected an old 50+50 stereo amp and speakers to my PC - really good!
-- Dirk
Array calculations done two ways.
1) Via delta-to-wye transformations and wye-to-delta transformations as well as simplifications where appropiate. See Array.PDF at ABSE. Page one shows an enlargement of the original drawing with placement for wye and delta transformations color coded to value. Page 2 shows actual replacement, with color coding. Note blue is used for one-half ohm resistors, black for one ohm and red for 2 ohms. In Page 3, simplification has been done and the next step of transformations is indicated in green. In a similar manner, Pages 4 and 5 show that the array has been reduced; not some resistors now are negative or zero. In pages 6 and 7, the array was further reduced. Page 8 shows the intermediate result, with "construction" lines; orange for two ohm wye-to-delta and greenfor the other transformation. Page 9 shows the results while keeping the color coding. Page 10 ("A") shows the net parallel value of 1.5 & 2.5 ohms as well as the parallel value of the two one ohm resistors. A delta-to-wye transformation is indicated for the next step. The transformation has been done, shown on Page 11 ("B"). A simplified version is shown on Page 12 ("C"). Again a parallel value was calculated and shown on Page 13 ("D"). The net value is also shown (0.527183179 ohms approximately).2) An attempt was made to duplicate the array AKA mess in SPICE just for kicks; note the net resistance is quite different. See attached.
So, there is at least one error in one or both schemes as shown.
Comments?
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