Rolls DB25 Matchbox Manual & Schematic 电路图.pdf

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1、DB25 MATCHBOX Direct Box Owners Manual LIMITED WARRANTY This product is warranted to the original consumer purchaser to be free from defects in materials and workmanship under normal installation, use and service for a period of one (1) year from the date of purchase as shown on the purchasers recei

2、pt. The obligation of Rolls Corporation under this warranty shall be limited to repair or replacement (at our option), during the warranty period of any part which proves defective in material or workmanship under normal installation, use and service, provided the product is returned to Rolls Corpor

3、ation, TRANS- PORTATION CHARGES PREPAID. Products returned to us or to an authorized Service Center must be accompanied by a copy of the purchase receipt. In the absence of such purchase receipt, the warranty period shall be one (1) year from the date of manufacture. This warranty shall be invalid i

4、f the product is damaged as a result of defacement, misuse, abuse, neglect, accident, destruction or alteration of the serial number, improper electrical voltages or currents, repair, alteration or maintenance by any person or party other than our own service facility or an authorized Service Center

5、, or any use violative of instructions furnished by us. This one-year warranty is in lieu of all expressed warranties, obligations or liabilities. ANY IMPLIED WARRANTIES, OBLIGATIONS, OR LIABILI- TIES, INCLUDING BUT NOT LIMITED TO THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULA

6、R PURPOSE, SHALL BE LIMITED IN DURATION TO THE ONE YEAR DURATION OF THIS WRITTEN LIMITED WARRANTY. Some states do not allow limitations on how long an implied warranty lasts, so the above limitation may not apply to you. Salt Lake City, Utah 8/99 IN NO EVENT SHALL WE BE LIABLE FOR ANY SPECIAL, INCID

7、ENTAL OR CONSEQUENTIAL DAMAGES FOR BREACH OF THIS OR ANY OTHER WARRANTY, EXPRESSED OR IMPLIED, WHATSOEVER. Some states do not allow the exclusion or limitation of special, incidental or consequential damages so the above limitation or exclusion may not apply to you. This warranty gives you specific

8、legal rights, and you may also have other rights which vary from state to state. DB25 Matchbox Converts high-impedance to low- impedance & vice-versa Ground Lift for hum reduction Attenuator switch for connection to line level or speaker level signals The DB25 is a passive direct box for converting

9、a high impedance signal such as a direct out from a bass amplifier, to a low impedance signal such as a snake input and a mixers microphone input. The Ground Lift is provided to reduce possible ground hum or buzz. 0 dB -20 dB -40 dB ATTENUATOR MATCHBOX DB25 GROUND LIFT GNDLIFT IN OUT RadioFans.CN 收音

10、机爱 好者资料库 INTRODUCTION Thank you for your purchase of the DB 25 MATCHBOX, 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 40 dB, and a Ground Lift switch which may reduc

11、e unwanted hum caused by ground loops. DESCRIPTION Input Jacks: 1/4 unbalanced jacks for receiving line or in- strument level signals. Attenuator switch: Reduces the input signal by the amount indicated. Ground Lift Switch: In the Lift position, the ground connec- tion of the XLR jack is disconnecte

12、d from the chassis. Output Jack: XLR balanced jack for connection to a mixing board or other balanced input device. SPECIFICATIONS Frequency Response:50 - 15kHz +/- 3 dB Output Impedance:600 Input Impedance:50K Max Output Level:+4 dBm EXAMPLE APPLICATIONS J1 PHONE 1/4 J1 PHONE 1/4 1 1 2 2 3 3 J3 XLR

13、 M PC J3 XLR M PC T1 50K - 600 CT T1 50K - 600 CT 8 8 7 7 5 5 6 6 SW1B ALPHASW -20 SW1B ALPHASW -20 R110KR110K 1 1 2 2 4 4 3 3 SW1A ALPHASW 0 Db SW1A ALPHASW 0 Db J2 PHONE 1/4 J2 PHONE 1/4 -40-40 R2100KR2100K R3 1K R3 1K 1 1 2 2 3 3 SW2A DPDT LIFT Date: December 22, 1992Sheetof SW2A DPDT LIFT Date:

14、December 22, 1992Sheetof SizeDocument NumberREV ADB25.SCH SizeDocument NumberREV ADB25.SCH Title DB25 MATCHBOX Title DB25 MATCHBOX ROLLS CORPORATIONROLLS CORPORATION 0 dB -20 dB -40 dB ATTENUATOR MATCHBOX DB25 GROUND LIFT GNDLIFT IN OUT AMPLIFIER MIXING BOARD 0 dB Setting BASS GUITAR 0 dB -20 dB -40 dB ATTENUATOR MATCHBOX DB25 GROUND LIFT GNDLIFT IN OUT -40 dB Setting SPEAKER OUTPUT 0 dB -20 dB -40 dB ATTENUATOR MATCHBOX DB25 GROUND LIFT GNDLIFT IN OUT RadioFans.CN 收音机爱 好者资料库