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Figure 4

INTERNAL SWITCHES AND CONTROLS (NO TAG)

1. Battery Compartment: Holds two 9 V alkaline batter-

ies. Two fresh batteries will power the unit for about

eight hours under normal conditions.

2. Microphone Power Selection Switch: Position this

slide switch to match the type of input power desired:

Top Position 12V T (A-B):

Refer to Figure 5. Used

with certain Sennheiser and Schoeps microphones.

–

Balanced Audio

to Microphone

Preamp

Figure 5

FP33

Input

180 Ω

12 V

Power

(A-B)

I = Microphone Supply Current

Middle Position (Dynamic):

No dc power on pins 1,

2, or 3. Used with dynamic microphones or condenser

microphones that have internal batteries.

Bottom Position (Phantom):

Refer to Figure 6. In-

ternal DIP switch 11 selects 12 volts or 48 volts. 48 V

phantom power drains the batteries faster than 12 V

phantom power. Used with all condenser micro-

phones that do not require T power.

–

12–48 V

Phantom

Power

Balanced Audio

to Microphone

Preamp

Figure 6

Phantom

FP33 Input

I = Microphone Supply Current

Phantom

–

R = 680 Ω for 12 V

R = 6.8 kΩ for 48 V

Caution: Balanced dynamic microphones will not be

damaged by phantom power but may be damaged by

T power.

3. Fuse and Spare Fuse: Designed to protect the FP33

from damage that may result from using a common ex-

ternal dc power supply with other electronic devices.

Caution: Damage may result when using a common

external dc power supply with other electronic devices

that are “positive ground.” Separate power supplies are

recommended.

Level R Potentiometer: Attenuates the level of the

FP33 right channel program audio that is fed to the

headphone/monitor circuit. This does not affect the

Monitor In levels at the headphone output.

5. Peak LED R Potentiometer: Adjusts the Right Peak

LED to light at a preset output level. The factory setting

is +17 dBm. The user adjustment range is 0 dBm to

+17 dBm. See the Peak LED Adjustment paragraph.

6. Peak LED L Potentiometer: Adjusts the Left Peak

LED to light at a preset output level. The factory setting

is +17 dBm. The user adjustment range is 0 dBm to

+17 dBm. See the Peak LED Adjustment paragraph.

7. Lim Adj R Potentiometer: Adjusts the Right limiter to

operate at a preset output level. The factory setting is

+15 dBm. The user adjustment range is 0 to +15 dBm.

See the Limiter Threshold Adjustment paragraph.

8. Lim Adj L Potentiometer: Adjusts the Left limiter to op-

erate at a preset output level. The factory setting is

+15 dBm. The user adjustment range is 0 to +15 dBm.

See the Limiter Threshold Adjustment paragraph.

Level L Potentiometer: Attenuates the level of the

FP33 left channel program audio that is fed to the head-

phone/monitor circuit. This does not affect the Monitor

In levels at the headphone output.

10. Meter Adj R Potentiometer: Adjusts the Right meter to

indicate 0 VU at a preset output level. The factory setting

is +4 dBm. The user adjustment range is 0 to +16 dBm.

Refer to the VU Meter Adjustment paragraph.

11. Meter Adj L Potentiometer: Adjusts the Left meter to

indicate 0 VU at a preset output level. The factory set-

ting is +4 dBm. The user adjustment range is 0 dBm to

+16 dBm. See the VU Meter Adjustment paragraph.

12. Internal DIP Switches: 12 internal DIP switches al-

low the user to customize operation. The function of

each DIP switch is listed in the table on the following

page.

1 2 3 4 5 6 7 8 9 10 11 12 13 14

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