Use With Psx-R - Cyrus 6 DAC User Manual

USE WITH A PSX‐R
Use with a PSX‐R
When a PSX‐R power supply is connected to a Cyrus 8 DAC, the presence of power as the PSX‐R
is switched from standby automatically disconnects the feed from the internal power supply to
the preamplifier regulators (via switch transistors T406/T402). The power from the PSX‐R is
then fed to the preamplifier regulators via D451/D454.
No modification is necessary to the amplifier for use with a PSX‐R, it may be connected without
any changes to the amplifier.
The connections between the amplifier and PSX‐R function as follows‐
Pin 1 (Standby)
This is an output from the amplifier to send a standby control message (logic 1, +5V) to the
PSX‐R, enabling the regulated power supplies of the PSX‐R. Note that this pin will not change
state if the amplifier detects a fault (See pin 5).
Pin 2 (Positive supply)
In Cyrus 8 DAC amplifiers, this pin delivers +18V from the PSX‐R to the amplifier, switched by
the Standby control system.
Pin 3 (GND)
This pin is the system ground return between the amplifier and PSX‐R.
Pin 4 (Negative supply)
In Cyrus 8 DAC amplifiers, this pin delivers ‐18V from the PSX‐R to the amplifier, switched by
the Standby control system.
Pin 5 (PSX‐R detect)
This pin is an input to the amplifier to detect the presence of a working PSX‐R. The pin also sets
the working mode of the PSX‐R. T408 and associated components act on the line to set a
reference voltage that switches the PSX‐R to variable mode, set for 18V supply.
This diagram shows the pin numbers of the
power supply input connector on the
amplifier. View is of the connector pins from
the rear of the amplifier
© Cyrus Audio Ltd Jun 2014 16 Cyrus 6 DAC, Cyrus 8 DAC service manual Issue 1