17
The Volume
Control
The R200i features precision dual electronically controlled resistor ladder
network volume controls, with special consideration given to the layout.
Local supply regulation and passive bypass components are used to assure
optimal results.
An active output stage is incorporated to ensure signal integrity to the dual
power amplification stages and single ended preamplifier output stage. It
is capable of driving a 470
Ω
load with a dynamic range of 116dB.
The Output
Stage
Each output stage incorporates 6 Toshiba high current MOSFETs. With a
theoretical maximum current capability of 36 amps, there is a massive
amount of headroom inbuilt into this unit. Being larger devices, they have
a lower on-state resistance, this feature is significant as less heat is required
to be dissipated by the heat sinks.
For optimal heat dissipation, each device is evenly spaced across the
current gain board.
Special emphasis has been given to the circuit layout, thereby ensuring
sonic integrity.
Protection
Functions
The R200i features a sophisticated protection package for the mains
supply, amplifier and connected load. Protection covering: External AC
supply, Maximum volume, Internal AC supply, Clipping, Over current,
Over temperature, DC Offset, Internal fuse failure protection. For a
complete discussion on the onboard protection functions, please refer to
Chapter 3 “Protection Functions”.
Input
Configuration
Input labels are user assignable. At switch on, the unit always resorts back
to the last input used.
The Role of
the Micro-
Processor
The onboard microprocessor handles all interfacing, monitoring, and
switching functions.
The design also provides for maximum separation between digital and
analogue circuitry.
User configured settings are stored in non-volatile EEPROM. The R200i is
fully software upgradeable.
