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Variable resistor

Resistors typically comprise a resistive material, such as a thick film resistor element or a resistive wire, to which terminations are attached for electrically coupling the resistor to other circuit elements. One type of resistor is a variable resistor for varying the resistance provided between the terminations. A variable resistor generally comprises a case having a concavity, a resistor substrate having a resistor formed on the surface thereof and disposed on the bottom of the concavity of the case, and a rotor having a slider fixed to the underside thereof and received rotatably in the concavity of the case. The resistance can be changed by sliding the slider on the resistor of the resistor substrate. A rotary variable resistor with switch is characterized by having two mechanisms, that is, the variable resistance mechanism for varying the resistance value, and the switch mechanism for electric contact and non-contact by on/off operation of the switch. A multiple rotation adjustment type variable resistor preferably has a clutch mechanism for facilitating adjustment of resistance. Variable resistors have been found widely useful in versatile mechanical instruments and electrical or electronic devices. Most commonly, the variable resistors are serving as adjusting and/or controlling elements for many kinds of signals, for example volume level of sound generating devices, light intensity of laminating means, temperature of heating apparatus, etc.

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