Mixer Linking; Powering; Power Switch And Led; Internal Batteries - Sound Devices 302 User Manual

page 14
M L
IXER INKING
make the connection between
Tape Out and Mix In
To add inputs to the 302, an additional mixer can can be connected (linked) into its Mix In connection. The
unbalanced Mix In connection is directly compatible with Sound Devices MixPre, 302, and 442 mixers. A
simple connection between those mixer Mix Out/Tape Out and the 302 Mix In adds their input channel to
the 302's output bus. The unit connected via the Mix In will contain all inputs.
When linking with a 442 a system of seven microphone inputs is achieved. Generally when linking to a 442,
the 442 is used as the master, linking with the 302's Mix Out to the 442's Mix In. At the 442 outputs, all seven
inputs appear.
Sound Device XL-1 accessory cable can be used to link multiple 302 mixers or 302 and 442 mixers. Sound
Devices XL-3 accessory cable can be used to link a MixPre to the 302 for a system of fi ve inputs. Note: link
cables must be wired to short pin-1 to connector shell in order to open the Mix In connection.
P
OWERING
The 302 can be powered from either internal batteries or from external DC. The power-effi cient 302 can
operate from three AA alkaline batteries for nearly a production day (less with phantom powering). While
many users prefer external DC sources to power both their mixer and wireless receivers, the use of internal
batteries is perfectly feasible for both primary and backup powering of the 302.

Power Switch and LED

The 3-position power switch selects between internal batteries, external DC, or power off. Because of the
power supply design of the 302, the unit takes approximately 10 seconds to fully stabilize its power sup-
ply after power-up. Additionally, there is suffi cient capacitance in the circuit to toggle between internal and
external without disruption in audio.
The power LED illuminates solid green to indicate good power. When the power source falls below the
threshold voltage (see chart on next page) the power LED begins to fl ash. Once fl ashing changing the power
source is recommended.

Internal Batteries

The 302 uses a unique battery tube to hold 3-AA batteries. This robust tube is sealed to prevent potential
battery leakage from ruining internal circuitry. The threaded-nickel cap extends beyond the panel to make
battery changes easy and quick.The battery tube extends no farther than adjacent XLR connectors.
Note: Remove batteries when the unit is stored for extended periods.

External DC Sources

For extended mixer runtime use an external DC source. The 302 can be powered from any DC source with
a voltage range of 5 volts to 18 volts. If using an AC-to-DC transformer, such as a Sound Devices XL-WPH,
make certain its output voltage falls in the 5–18 V range and can supply at least 4 watts. If an over voltage
is applied to the mixer, an internal poly fuse is opened to prevent mixer damage. The fuse is reset when the
voltage is removed.
302 Compact Production Mixer
User Guide and Technical Information