Low noise microphone amplifier developed for AD140 series
of mixers. Power is provided for 48V Phantom and 12V Tonader
microphones
A simple but effective three band equaliser,
proved and approved under field conditions, in use throughout the AD140
series of mixers
Inputs are transformer balanced and protected
against radio-frequency interference. A high-pass filter protects
against low-frequency saturation
The main stereo output is transformer balanced and has separate left and right faders
Two
auxiliary outputs are transformer balanced and have separate master
rotary controls. Auxiliary 1 & 2 are routed from each input using a 3
position switch (off, pre and post fader). Auxiliary 2 has a rotary
level control
Limiters, which may be linked for stereo
operation, are incorporated in the main output. Limiting is indicated by
a pair of LEDs .
Direct outputs are unbalanced and driven from a very low impedance source with high drive capability.
Two
LCD meters display - either PPM or VU - monitor the main output,
auxiliary output and PFL of each input. Useful for monitoring level at a
direct output. Battery level and monitor status (Direct or Return) are
also indicated. Meters can be illuminated.
The frequency of
the internal oscillator can be selected between 1KHz and 10KHz, it's
output replacing the signal on the main output.
Via an
internal microphone, the mixer operator is able to communicate with the
main output (SLATE) and with an outstation (EXT) . The outstation
normally receives a mono of the mixers main output.
The
headphone monitor may be switched between main output, auxiliary outputs
and return. All have PFL override. Monitor selectors allow left ,
right, left + right, auxiliary 1, auxiliary 2 and auxiliary 1 + 2 to be
routed to the headphone socket. An M-S matrix amplifier may be inserted
in order to decode main or auxiliary outputs in the M-S domain.
An
electronically balanced stereo tape return appears on a pair of stereo
jack sockets. An input calibration potentiometer is adjacent to the jack
sockets on the connector panel.All input and output connectors are presented on one surface of the case and in line with their corresponding modules.The mixer receives power from 8 x C cells fitted internally or from an external 12V - 15V DC source.
