PPS-2
PPS-2
2 channel Phantom Power Supply - User Guide
INTRODUCTION
The PPS-2 is a two-channel 24 volt
phantom power supply designed to power condenser mics needing DC
current to be supplied to the capsule. Both channels are identical,
and can be used simultaneously. 24v is adequate for very many
mics (consult your mic's user guide), other than the more expensive
models which need 48 volts. Please use our PPS-48 4 channel
mains powered model for these microphones.
FITTING BATTERIES
Remove the lid. Snap on the 3
battery connectors; lay the first two batteries down flat nearer the
back of the box, and the third one lying upright (on edge) nearest
the circuit board. Different makes of batteries vary
slightly in size, it may be possible to fit all 3 into the
compartment on edge.
Note that the unit arrives from the factory with the battery clips joined together. If only one 9v battery is available, it can be used to run the unit leaving these clips joined - many mics in fact only need 1.5 to 9 volts. The battery-low led will of course glow under this circumstance. To re-join the clips after they have been undone:- looking from the right side at the leads as they emerge from the circuit board, join the centre clip negative (hexagonal) to the left positive (round) clip, and the centre positive to the right negative. Fit the battery to the two remaining free terminals. If batteries are not fitted, leave the plastic sleeves over the clips to prevent them from touching other parts of the unit.
CONNECTIONS
Connect the microphone to the
input with a balanced XLR to XLR screened cable. 24 volts will
be fed back to the microphone from this input. Connect the
output socket to a mic input on a mixing desk or stage box.
OPERATION
The unit can be used with regular
or re-chargeable batteries, or with an external DC power supply.
To use with batteries, move the switch to the 24v Remote
position. The battery-low led will glow when the batteries are
down to about 12 volts. This can be overridden by plugging in an
external DC supply into the 3.1mm socket. In this case the
'battery-low' led will also indicate a low DC current warning.
In the 'off' position the switch disconnects the batteries, and the unit will run on remote DC only. Selecting the 'Re-charge' position enables the internal batteries to be re-charged in situ via the 3.5mm socket.
WARNING: Always double-check that the batteries fitted are the re-chargeable type.
As an extra safety precaution, a user-selectable jumper link, labelled J6, will be found inside to left of the switch body. This is factory set in the right hand position, which prevents re-charging. With a pair of flat nosed pliers, pull the link plug up vertically and slide it over the left and centre pins to enable re-charging. Move it back if regular batteries are subsequently fitted.
NOTES: During
re-charging (switch to the left), the unit can still be used on a
remote DC supply.
The
signal path is still connected when the unit is switched to 'off'
and not powered.
Always
select the 'off' position after use to avoid draining the batteries.
Two
other (wire) links are fitted, L1 and L3, just behind the input
XLR's. If hum loops
occur,
these can be cut, making the chassis float with respect to signal earth.
SPECIFICATION
Input level: Max .25 volts RMS
Freq. Response: 20Hz-22KHz ±1dB
XLR wiring: Pins 2 & 3
live, Pin 1 earth
Power: 3xPP3 regular or
re-chargeable batteries. DC input for external regulated psu
via 3.1mm socket, 1.5 to 24v.
Re-charge input 24v via 3.5mm
minijack socket. Re-charging 3 batteries at once will require
30 or more volts.
Led Indicators: Battery low,
glows @ approx. 12v. 24 volt DC connection. 24 volt re-charge.
Download the MTR e-book from the home page of our website. We welcome owner/user feedback.
MTR Ltd, Ford House, 58 Cross Rd, Bushey, Herts,
WD19 4DQ UK
Tel: +44-(0)1923-234050 Fax: -255746
e-mail: mtrltd@aol.com www.mtraudio.com
PPS-248
& PPS-48
2
& 4 channel Phantom Power Supply
- User Guide
These models provide 2 and 4 independent channels of 48 volt phantom power for use with condenser microphones which require a DC voltage to energize the capsule.
CONNECTIONS and USE
Power: With U.K. versions, connect the power lead supplied to a 230v mains power outlet, and the IEC plug to the inlet socket on the back of the unit. Export models will need a suitable mains plug to be fitted to the power lead. When switched on, the '48v on' led will illuminate to confirm that 48 volts is present.
Audio: Connect up to two
(PPS-248) or four (PPS-48) microphones to the 2 or 4 XLR mic inputs
on the front edge. Connect the 2 or 4 XLR output sockets on the
rear edge to the mic inputs of a mixer etc. If hum occurs due
to an earth loop, raise the Earth Lift switch on the rear panel.
SPECIFICATIONS
Inputs: Balanced 3 pin
female XLR, 48v on pins 2 & 3
Outputs: Balanced 3 pin male XLR
Freq. Response: 20Hz-20KHz ±1.5dB
Input Level: 500mV max. RMS
Fuse: Internal 50mA
Power: 220-240vAC, 50Hz
Dimensions: 260x110x48mm
Weight: Net 1.3Kg
BS EN 61938:1997/IEC 61938:1996
Download the MTR e-book from the home page of our website. We welcome owner/user feedback.
MTR Ltd, Ford House, 58 Cross Rd, Bushey, Herts,
WD19 4DQ UK
Tel: +44-(0)1923-234050 Fax: -255746
e-mail: mtrltd@aol.com www.mtraudio.com