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If the levels are too low,
increase the gain on the Lino C. (For monitoring / playback, if the
output
levels of your
interface can be adjusted independently of the input levels, use the +4 dBu setting for the
output
.)
(2) Balanced Output Signal Connectors - Signal Source
Balanced Output Phono Stage (factory setting):
slide the two two-pole DIP switches according
to the diagrams on the cover for RIAA. Standard RIAA output is the factory configuration unless
Channel D is advised in advance of shipment that you intend to use the Lino with an external
ADC.
Flat Phono Preamplifier for using with an external ADC and Pure Vinyl:
slide the two DIP
switches according to the diagrams on the cover for FLAT.
Do not set the switches to any other setting than shown, or severe distortion will result.
(3) Cartridge Loading:
As a current mode phono preamplifier, the Lino C doesn’t require setting the
cartridge load. All of the signal current produced by the cartridge is fully used with this design, which also
insures that the cartridge’s mechanical and electrical characteristics are fully damped and optimized.
(4) Charging / On Grid Signal Port:
A 2.5 mm barrel jack is provided on the bottom of the preamplifier.
When the Lino C is playing music (signal present) the port will have 0 volts. When the Lino C is in
charging mode, 5 volts is supplied at the port (tip positive) via a small signal relay inside the Lino C. The
5 volts is referenced to chassis ground (circuit common).
This is a useful feature that can be used in conjunction with the Lino C’s “off the grid” mode.
Though the charging supply is automatically disconnected internally when a signal is present, some audio
enthusiasts express additional concern about external power supplies putatively affecting the quality of
the utility line power delivered to other components in the audio system. This “off the grid” mode allows
operating the Lino without having the power brick energized or connected to utility power.
- MANUAL “off the grid” mode:
Disconnect the power supply two prong plug from the utility
power line. The power supply barrel must remain inserted in the Lino. Unplugging the barrel
connector will power down the Lino.
The disadvantage to manual mode is that you must remember to reconnect the power supply to
avoid over-discharging the battery.
- AUTOMATIC “off the grid” mode:
An optional, isolated power switching relay is required
(not supplied). These can be obtained from vendors like Amazon. Example:
https://www.amazon.com/Iot-Relay-Enclosed-High-Power-Raspberry/dp/B00WV7GMA2
or search for “AC / DC Control Relay”
These use a trigger input, such as the 5 volt charging signal supplied on the
Charging / On Grid
Signal Port
to activate the power line.
The charging signal port can be used to automatically connect and disconnect the Lino C power
supply from the utility power. When a signal is present and the preamplifier is in operation, the
power supply is completely disconnected from the utility line. When a signal is not present, the
power supply is automatically reconnected, charging the battery.