Javalab
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Lars Drud Nielsen ldn@oersted.dtu.dk |
With a proper choice of resistance values the five switch combinations in the table below will establish a heater function with a zero and four distinct non-zero power levels (P):
0 | 1 | 2 | 3 | 4 |
OFF OFF OFF OFF |
OFF ON OFF ON |
OFF OFF ON ON |
ON OFF ON OFF |
ON OFF ON ON |
With the two resistance values being equal the four non-zero power levels will degenerate into only three distinct values of P. A kind of optimal spreading of four values of P is obtained by choosing a resistance ratio around (2)½.