User manual SENNHEISER MKH 435 T

[. . . ] High frequency circuit The capsule of a HF condenser microphone presents, contrary to low frequency circuits, a low impedance output. Instead of the high polarisation voltage normally required, a high frequency capsule needs only a high frequency voltage of about 10 volts, which is produced by a built-in crystal-oscillator (8 MHz). The low capsule impedance leads to a very small self-induced noise signal from the microphone and to a high performance reliability. [. . . ] Connection to amplifiers with unsymmetrical inputs In many cases, for example most tape recorders, the input socket is unsymmetrical. in this case one side of the symmetrical microphone output has to be earthed. Apart from cases where the microphone is being used for professional studio purposes, this is not critical, as the large output voltage of the microphone combined with its low output impedance provides a large signal to noise ratio. Care should be taken, however, 9 That when the microphones are mounted on tripods etc. Connection to amplifiers with high input sensitivity If the amplifier being used has a very high input sensitivity, i. When it is normally intended for use with dynamic microphones, it can be necessary to reduce the output voltage from the microphone by means of a voltage divider. This should be built into the microphone cable at the amplifier input. By this means the large signal on the microphone cable is maintained up to just before the amplifier, which helps to increase the signal to noise ratio. Connection to amplifiers with defined input impedances Senn heiser studio condenser microphones can be connected direct to all amplifiers whose input impedance is larger than 200 Q. Should, however, the input impedance be smaller than 200 Q, a resistor of appropriate value should be placed in series with the microphone so that it "sees" at least 200 Q. The voltage division caused by this series resistor must of course be considered. The same method can be used when a higher output impedance of the microphone is demanded. In this case again, aseries resistor can be used to provide correct matching. It should be so stabilised and filtered, that the unweighted noise voltage is less than 5 I-lV and that the weighted noise components are less than 2 I-lVolts. [. . . ] Only one microphone can be used with the MZN 5-1 if the inputs are unbalanced or it is necessary to make the inputs ungrounded by using isolating transformers. The power supply the microphone is also taken from the line roll-oll-filter is included in both channels. 0942) For the connection of condenser microphones, or symmetrical low impedance dynamic microphones, to the line and accessory inputs respectively, of the Nagra 11I or Nagra IV. [. . . ]