Audionet PRE G2, User Manual

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10 Technical information
10.1 Design
The PRE G2 has complete double mono design for absolute channel
separation. To optimize the high frequency properties the circuitry was
consequently miniaturized and SMD technology implemented. Signal
path ways are limited to their minimum, and chassis and circuit design
magnetically and capacitively optimized. The System is controlled and
monitored by a powerful microprocessor. The control unit and the analog
section are galvanically separated by opto-couplers.
10.2 Power supply
Power is provided by two encapsulated 100 VA toroid core transformers.
Fast buffer capacitors, especially designed for Audionet, with 82.000
m
F
for each channel and extremely fast, discrete regulators stabilize the sup-
ply voltages. Additionally, voltages are smoothed locally by 12 regulators
for each channel. Thus, the power supply is quasi de-coupled from mains
accumulator-like. Also, the digital section has its separate power supply.
10.3 Circuitry
All operational amplifiers (OP) in the signal path are discrete and opti-
mized for their special purpose. Each OP is supplied with power by to
fast and discrete regulators. All 10 discrete OP modules work in low dis-
tortion Class A mode and have a gain-bandwidth product of 1.5 GHz.
The input OPs have a nearly infinite input impedance and constant capac-
ity. Thus, they do not load the signal source. Gold plated precision relays
switch both signal and ground of the inputs.
The output OPs work in high bias current Class A mode rendering them
immune against reflux of the power amplifiers.
Volume and balance is controlled, free of electro-mechanical compo-
nents, by an electronically switched and in real-time linearized precision
resistor network with true 1 dB resolution.
10.4 Handling
A microprocessor controls and monitors all functions. A two line, 16-
digit display informs the user about all operating modes and makes it
easy to adjust the PRE G2 to the user's preferences. The unit also features