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The comeback of the carbon resistor has not been lost on this program. So in deference to this renewed interest in carbon resistors Audio Gadgets has the five band and four band color system mapped out for you. Here the color coding is made interactive. Just point and click and your color choices are translated in resistance values. Conversely, enter the resistor value and the program displays the colors. Voltage and current limits are also displayed, as are parallel resistor choices.
Color Codes
The 5 band resistor color coding system covers resistors from 1% to .05% tolerance. The 4 band resistor color coding system covers resistors from 20% to 2% tolerance.
To figure out a resistor's value first select the "4 Band" or "5 Band" eyelet depending on how many color bands the resistor has. (As you hold the resistor horizontally, the band that is metal colored or stands apart from the rest should be on your right.) Second, move the cursor over the colored squares until it changes into a cross. Then click the color squares that match with the bands of the resistor.
To find the colors associated with a certain resistor value, enter or choose the value from the resistor drop-down box; the matching colors will appear on the drawing of the resistor to its left. If the displayed text changes from aqua to red, an error condition has been encountered, e.g., the resistor value does not belong to the group of common fixed resistor values.
Parallel Resistor Calculations
Parallel resistors can be evaluated by entering the parallel resistors values in the R1 and R2 boxes. To determine what resistor in parallel with some known resistor yield some desired value, just enter the desired value in the R box and the known parallel resistor value in the R1 box.
Voltage & Current Limits
For each resistor ohmage and wattage there exists a voltage and current limit, which if either is exceeded, results in smoke. To let Audio Gadgets figure out these limits is easy enough. Just check the appropriate choice eyelet for the resistor wattage. The resulting voltage and current limits for the specified resistor are displayed above in their display frames.
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