Nearest highest 10% resistor = 1.5 KΩ Leds in series calculation ![]() Safe pick (resistorâs power rating) = 0.3 W The form above is based on the following led resistor formulas depending on the calculation performed:įor your convenience the following legend will be used in the formulas:Ä®xample in the case of a single led, with a supply voltage of 20volts, at a drop across led of 5volts and a desired current of 12miliamps. Just choose the calculation you want to perform, press Calculate button then the tool will do the math. The led calculator can handle led resistor calculations for different types and arrays so that it requires you to input specific fields depending on what you need to estimate. If flagÄ 59 32 53 10 x Compute 10 (1/n)Ä 64 33 07 STO7 Initialize error=RÄ 65 31 22 00 GSB0 Compute R'Ä 71 31 22 00 GSB0 Compute R''Ä 79 32 71 Xâ¤Y? If R''works for capacitors and inductors. Program approximates parallel resistance by substituting 1/R for R, and the reciprocal of maximum acceptable (R max) for R min. If R'' falls below the minimum resistance (Rmin), Rmin gets substituted for R''. If flag 2 is set, multiply R'' by 10 (1/n), clear flag 2, and go to step 5.If this is smallest error yet, save R' and R''. To calculate the closest fit, using a series connection, the following algorithm is used: (R' and R'' are the trial resistances R= the desired resistance) Precision resistor values are 24 to the decade, thus n=24. 5% resistors come 12 to the decade, thus n=12. Each succeeding integer results in the next standard value. Where n = the number of standard resistance values per decade, and x = an integer. Standard resistance values are calculated from the following formula: Two standard resistors can be placed in series or parallel to approximate a desired resistance. ![]() This program finds two standard resistors that, when placed in either series or parallel, give the closest approximation to a desired non-standard resistance value.
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