RTS Stereo Amplifier MDA 100 User Guide

MDA-100  
Mixing Distribution Amp  
Features  
The MDA-100 mixing and distribution amplifier contains an 8x1-summing amplifier (mixer) and a 1 x 8 distribution amplifier in a  
case that is one rack unit high. The MDA-100 is useful, for example, in camera control (CCU), where multiple camera operators  
have to talk and listen to one master control location. In this application, audio form, each camera (up to eight) is fed to one of the  
summing amplifier inputs of the MDA-100. All eight audio inputs are summed and fed to the master controller input. The return  
audio path from the master controller back to the individual cameras is accomplished using the distribution amplifier, which takes  
the single audio output from the master controller and distributes it to each of the eight camera outputs.  
A trimmer on the front panel of the MDA-100 may individually adjust the gain of each summing amplifier input. There is also an  
output adjustment trimmer located inside the MDA-100 to adjust the final output level of the summing amplifier. The summing  
amplifier output is a 60Ω voltage sources. The input impedance may be set for bridging (20 kΩ, 150 Ω, or 600 Ω, selected by  
rear panel jumpers.  
The MDA-100 fits into a standard 19” (483 mm) equipment rack. The power entry module is an IEC approved type, which con-  
tains a line voltage switch, a line filter, a fuse holder, and a line cord socket connector. The line voltage switch may be set for  
either 105/125 Vac, 50/60 Hz, or 210/250 Vac, 50/60 Hz supply voltages. The MDA-100 features a torroidal-transformer power  
supply for low-noise operation.  
Line Drawing  
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