Shure M62V free download

File name Shure-M62v preamp.pdf

222 HARTREY AVE · EVANSTON, ILL. (60204) U.S.A. DATA SHEET AREA CODE 312/328-9000 · CABLE SHUREMICRO MODEL M62V AUDIO LEVEL CONTROLLER MODEL M62V AUDIO LEVEL CONTROLLER GENERAL: The "Level-Loc" Audio Level Controller is basically a low noise preamplifier with unity gain from microphone level in to microphone level out or 60 db of voltage gain from Hi Imp. microphone level in to Aux. Output. The input and microphone level output contain matching transformers so either high or low impedance may be selected. In addition, a high impedance Aux. Output is provided capable of driving any high impedance amplifier, mixer or tape recorder input requiring 1 volt or less. This preamplifier has the additional capability of reducing its gain as the input signal increases, thereby ho/ding the output signal constant. After a predetermined input level is reached (threshold) the output level is "Locked", that is, it remains constant even if the input signal increases by as much as 100 times (40 db). This reduction in gain, which results in a constant output level, is obtained without introducing significant distortion or transients into the program material. The DISTANCE SELECTOR switch determines the input level at which gain reduction (Level-Lot action) begins. An INPUT LEVEL CONTROL is also provided that: 1. Can be used as a vernier control to allow fine adjustment of input threshold between the preset threshold levels selected by the DISTANCE SELECTOR switch. 2. Can act as an input attenuator for signals that are higher than normal microphone levels. Such inputs may be: signals from microphones used very close to the mouth, outputs from preamplifiers, line amplifiers, tuners or tape recorders. The Audio Level Controller: ­ n Reduces blasting or large volume increases when a speaker or entertainer varies his distance and position from the microphone. n Upgrades tape-recording systems and the Audio portion of Video Tape Recorders, by controlling the maximum signal level being fed to the recorder. This prevents distortion and overloading of the tape recorder which might be caused by "close talking" the microphone, or by very loud vocal or musical passages. Copyright 1969, Shure Brothers Inc. 27A823 (JI) n Permits any number of microphones to be used in a paging system or conference arrangement, without setting the level for each individual microphone. (For paging systems only low impedance microphones with normally open switches should be used.) Any number of these microphones may be operated in parallel across the low impedance input of the M62V, the Audio Level Controller will automatically set a fixed maximum paging level that cannot be exceeded. SPECIFICATIONS Input Impedance (below threshold): High Impedance: 50 K ohms Low Impedance: 300 ohms (for 25 to 600 ohm sources) Input Levels: High Impedance: microphone level to 10 volts max. (using input level control) Low Impedance: microphone level to .2 volt max. (using input level control) Output Impedance