Audio Developments AD256 - Manual (Page 7)

6
POWERING
The mixer may be powered from either internal cells or an external DC power source.
The integral battery compartment requires a total of 8 size-C cells. Access is gained
via a captive lid which is retained by two, 90-degree-turn buckles. The lid hinges
outwards 45 degrees from the back panel. When installing new cells, the row
nearest the hinge should be fitted first.
Either conventional dry or rechargeable nickel-cadmium cells may be used. NI-CADs
may be recharged in situ through the 4-pin POWER IN connector. (The circuit for
recharging is already incorporated within the mixer.) A voltage in the range +15V to
+24V DC @ 250mA is required on PIN 2 of the POWER IN XLR. A suitable unit is
supplied by Audio Developments. (AD Part No 94-100-016)
When driving the mixer from an external power source, PIN 1 is the 0V connection
and a voltage in the range +12V to +15V DC should be supplied to PIN 4. The power
source should be capable of delivering approximately 1.0A - allowing some capacity
for phantom powering.
If an external power supply unit (PSU) is to drive the mixer and simultaneously charge
a set of NI-CADs, a current capability of at least 1.0A is required. It is poor practice to
run a PSU at its limit, therefore we recommend a minimum of 1.25A.
A suitable unit is supplied by Audio Developments.(AD Part No 94-100-015)
WARNING: When NOT using the PSU (AD 94-100-015) supplied for the mixer,
ensure your 4-pin XLR is correctly wired to match the POWER IN connector. Failure
to do so may result in the breakdown of the internal DC-DC converter. Make this
check even if using a PSU which may have been supplied to you in the past.
AD100-05 and AD100-06 PSU are NOT suitable for use with an AD256 mixer and
must not be used.