Features, Operation | Crown Audio PH-1A instruction

PH-1A

he Crown® PH-1A is a single-channel, Tbattery- or AC-powered phantom

power supply for condenser microphones. Battery power provides 17V phantom and AC power provides 24V phantom.

SINGLE CHANNEL BATTERY OR AC POWERED PHANTOM POWER SUPPLY

Features

The unit can be AC powered by using the Crown PS-24 AC/DC adaptor (not included). This adaptor plugs into a 120V AC wall outlet and provides 24V DC to the PH-1A.

When using external power, the PH-1A provides +24V DC nominal loaded voltage on pins 2 and 3 with respect to pin 1 of the microphone input connector.

Supplies a single channel of phantom power to a condenser microphone

Supplies 17V with battery power and 24V with AC power

Rugged construction for professional use

If AC power fails, the batteries automati- cally take over

Quiet, transformer isolated

With battery operation, the PH-1A provides +17V DC nominal loaded voltage. “Loaded voltage” is the phantom voltage available with a microphone plugged in.

The PH-1A includes sufﬁcient hum ﬁltering for extremely quiet operation and is transformer isolated. If AC power fails, the batteries auto- matically take over.

The rugged steel and aluminum chassis is de- signed to withstand daily abuse in professional applications.

Operation

To use your phantom supply, follow this pro- cedure:

1. For AC power, plug the Crown PS-24 AC/DC

adaptor into an AC outlet providing 120 VAC, 60

Hz. Plug the 1/8 inch (3.5 mm) phone plug from

the AC/DC adaptor into the 1/8 inch (3.5 mm)

phone jack in the phantom supply.

2. For battery power, unscrew the two large

captive screws on the underside of the phantom

supply; open the chassis, and install two 9V

alkaline batteries (Duracell MN1604 or equiva-

lent). Replace the cover.

3. Plug the cable from your microphone into the

MIC IN connector.

4. Plug the cable going to the input of your

mixer or recorder into the OUTPUT connector.

Speciﬁcations

Phantom voltage supplied: 24V with AC powering; 17V with battery power. Each volt- age is nominal loaded voltage on pins 2 and 3 with respect to pin 1 of microphone input connector.

Number of channels: 1.

Microphone input connector: Female 3-pin professional audio connector (XLR-type).

Output connector: Male 3-pin professional audio connector (XLR-type).

DC power input connector: 1/8 inch (3.5 mm) phone jack, positive tip.

AC/DC adaptor: Use Crown PS-24 AC/DC adap- tor (not included). 120V AC input, 24V to 31V output, 1/8 inch (3.5 mm) phone plug output connector with positive tip.

Battery powering: Two 9V alkaline cells (Duracell MN1604 or equivalent). Batteries not included.

Battery life: 525/I hours, where I = current drain of microphone in mA. 350 hours typi- cal.

Hum ﬁltering (inside phantom supply): 50 dB at 60 Hz; 62 dB at 120 Hz.

Dimensions: 5.0 x 2.325 x 1.750 inch LWH (12.7 cm x 5.91 cm x 4.44 cm).

Weight: 1¼ lb. (0.57 kg).

Optional accessory: 24V AC/DC adaptor, Crown model PS-24.

This cable can be unbalanced because the phan-

tom supply is transformer isolated.

5. To prevent ground loops, be sure that the

phantom supply is resting on its rubber feet.

6. To avoid draining the batteries after use,

unplug the mic cables and unplug the AC/DC

adaptor from the phantom supply. There is no

battery drain when all cables are unplugged

Crown Audio PH-1A specifications Features, Operation, From the supply