LYCOS RETRIEVER 
Resistor: Resistors
built 264 days ago
Fuse Resistors serve a dual purpose, a resistor and a fuse. They are designed so that they will open with a large surge current. The fusing current is calculated based on the amount of energy required to melt the resistive material (the melt temperature plus the amount of energy required to vaporize the resistive material).
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Resistor manufacturers are listed on the Resistor page. Additional manufacturers may be found by clicking the Components icons at the bottom of the page. OEM resistor and electronic component distributors may be found by hitting the Distributors icon below.
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To determine the value of a resistor from the color band markings, hold the resistor so that the gold or silver band is to the right. If there are only 3 bands, hold the resistor so that the 3 colors are closest to the left end. Next, click on one color in each of the 4 colums to the right so that the resistor image above agrees with the resistor markings. The first two colors represent two digits, each from 0-9. The third color represents the number of zeros to add, and the fourth or right side color represents the tollerance. The color values correspond to the colors of the rainbow where violet has a higher value of (7) than red (2) since violet is closer to the higher end of the light spectrum.
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Shot noise is dependent upon current, so the more average DC current through a resistor, the more noise you get. In order to reduce this type of noise, you must keep the DC current to a minimum. This is best done in the first amplifier stage or in low-level stages such as reverb-recovery amps, where it is the most critical. Unfortunately, higher DC currents usually sound better in tubes, so it is a tradeoff. Best practice is to use a wirewound or metal film in these applications, unless you are making a high-frequency amp where the inductance of the wirewound resistor comes into play. This is not generally a factor in guitar amps.
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State of the Art, Inc. (SOTA) has been granted qualification by the Defense Department (DSCC of Columbus, OH) for the new MIL-PRF-32159 ZERO OHM chip resistor. The new specification provides zero ohm jumpers at three product levels: Space level T (including 100 percent burn-in), established reliability product level M and industrial product level C. Military grade jumpers are available in 13 case sizes with solderable, wire bondable, and epoxy bondable termination finishes, and are identical to our MIL-PRF-55342 product. SOTA has been manufacturing the ZERO-Ohm jumper resistor for over 25 years, and has extensive experience with high reliability testing and applications for these devices. Ideal for mission critical aerospace, biomedical, communications, and defense applications. Pricing is under $1.00 in production quantities. State of the Art, Inc., is a leading manufacture of high reliability resistive products for the aerospace, communications, satellite, biomedical, defense and other industries.
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RESISTOR COLOR CODES The most common resistors have a tolerance of plus or minus 5%. These resistors have 4 color bands. The first 2 color bands give the first 2 digits of the resistor's value. The 3rd band give the number of 0's added to the first 2 digits. If the third band is gold, you multiply the first 2 digits by .1. If it is silver, multiply by .01.
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