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Line Level Pre Amplifier Cap002 The Unit Is - Cie

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LINE LEVEL PRE AMPLIFIER CAP002 The Unit is designed for use with electret condenser microphones and is factory set for 24-volt operation and Line Level Output. Connections: Microphone: Connect Phase + (Hot) to screw terminal 3 on connector "PL2" Connect Phase – (Cold) to screw terminal 4 on connector "PL2" AC 24v or DC 12-24v connect +ve to screw terminal 1 on connector "PL2" connect -ve to screw terminal 2 on connector "PL2" Output connections "PL1": Screw terminal 3 = Phase + (Hot) Screw terminal 2 = Phase – (Cold) Screw terminal 1 = Ground If more headroom is required to avoid microphone distortion the resistor R5 should be changed: 1K 2K 3.9K 18.2K 100K as supplied gives minimum headroom gives approximately 6 dB more headroom gives approximately 12 dB more headroom gives approximately 18 dB more headroom gives maximum headroom (microphone level) This unit can also be used for Phantom Power Operation through the microphone cable. No separate power connections should be made, the red jumpers on the headers "JP1" and "JP2" on the circuit board should be repositioned from "B" to "A", and the resistor R5 changed to 100K. Pin 4 = Phase - (Cold) Pin 3 = Phase + (Hot) Pin 2 = Input voltage -ve Pin1 = Input voltage +ve PL 2 C2 R 21 C8 D2 D4 D3 D1 C5 B A B C6 C7 PL 1 Output Pin 1 = Ground R5 Gain C4 A C9 Output Pin 2 = Phase - (Cold) Output Pin 3 = Phase + (Hot)