Rolls DB225 DI Manual & Schematic 电路图.pdf

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1、Rolls Corporation 07/09 DB225 Professional Direct box -Converts high impedance to low imped- ance & vice-versa -Ground lift for “hum” reduction -Attenuator switch for getting the correct level The DB225 is a passive direct box for converting high impedance signals to low impedance and vica-versa. IN

2、TRODUCTION Thank you for your purchase of the DB225 Professional D-I. A passive direct box designed to take high impedance signals and convert them to low impedance. The unit features an attenuator switch for padding the input signal by either 20 or 40dB, and the ground lift switch may be used to re

3、duce unwanted hum caused by ground loops. INSPECTION 1. Unpack and Inspect the DB225 package Your DB225 was carefully packed at the factory in a protective plastic clamshell package. Nonetheless, be sure to examine the unit and the carton for any signs of damage that may have occurred during shippin

4、g. If obvious physical damage is noticed, contact the carrier immediately to make a damage claim. We suggest saving the shipping carton and packing materials for safely transporting the unit in the future. WARRANTY For information on the Rolls One Year Limited Warranty, and to register this product,

5、 visit our website at DESCRIPTION INPUT(S): 1/4” unbalanced jacks for receiving line or instrument level signals OUTPUT(S): XLR male and female for connection to a mixer board or other balanced input device. GROUND LIFT SWITCH: In the lift position, the ground connection to the XLR jack is disconnec

6、ted from the chassis. ATTENUATOR SWITCH: Reduces the input signal by the amount indicated. SPECIFICATIONS: Frequency response: 20 - 20kHz +/- 1 dB Max Output level: +4 dBm Input Impedance: 50K Ohms Output Impedance: 600 Ohms. Weight: 1 lbs. (.45 Kg) Size: 4.15” x 2.46” x 1.55” 75889 0225066 1 Rolls

7、Corporation 5968 So 350 West MurrayUtah 84107 1 DB225.SCH5199 19 May 2009 Document Number: Date: Rev: Sheetof DB225 Direct Box Ba GROUND LIFT ATTENUATOR 3 1 2 SW2 SPST R1 1M R2 100K R3 10K 1 2 4 3 SW1A ALPHASW 8 7 5 6 SW1B ALPHASW 12 3 J3 XLR JACK M J1 PHONE 1/4 J2 PHONE 1/4 T? XFMR AUDIO SCHEMATIC DB225 Professional Direct Interface - Studio - Live - Broadcast . anywhere you need a professional D-I box DB225DB225DB225 RadioFans.CN 收音机爱 好者资料库