the 68K Ohm 1/4W Resistor – Pack of 20 Find it and more at Jameco Electronics. Browse over 30,000 products, including Electronic Components, Computer Products, Electronic Kits and Projects, Robotics, Power Supplies and more. Products in stock and ready to ship.This useful resistor kit contains 1000pcs 50 values 1/4W carbon film resistors, which can provide great convenience for your repair work, Carbon film resistor.At high temperature and under a high pressure, a ceramic carrier is held in hydrocarbon gas. The gas (methane or benzene) is cracked at a temperature of 1000°C. The crystalline carbon is pyrolytically deposited on the ceramic substrate. Because of the precise distribution of the pure graphite without binding, these carbon resistors have a low noise. The desired resistance value can be obtained by choosing the right layer thickness, and by cutting a spiral shape in the carbon layer. The helical cut in the film increases the length of the current path. By decreasing the pitch of the helix, the length of the resistive path increases, and therewith the resistance value increases. Furthermore, by fine tuning the cutting of the spiral the resistor can have a higher accuracy of resistance value
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