Mackie CR1604 RF Input Modification

Page 1

INTERNHL MODIFICQTION 0F MIC INPUTS OF THE MRCKIE 1604
EXTENDS COMMON-MODE REJECTION UOLTAGE RANGE To :300 u
and DIRTUALLY ELIMINATES RF INTERFERENCE PROBLEMS

+48 +48
REMOUE PARTS
R3 P4 INSIDE DOTTED LINE R3 R4

Skel Bk81 * Jensen FB-Z EkSl Ek8l JT-MB-CA

7-Ré 55 ; -‚¬errite "beads"

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i r 47/59 T.OOI

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22/15 c3
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R8 R9
W5 WS ws $5
ORIGINHL MODIFIED
NOTES
RXL IS A :12 1/4u METAL FILM TYPE. ROEDERSTEIN MKZ-l OR EOUIUALENT, UALUE IN OHMS ( 3k74 = 3.?4k )
TICHTLv TNIST LEADS AS SHONN >3< IN PATH FROM J1 To T1 To MINIMIZE ELECTROMAGNETIC HUM PICKUP
KEEP GRY, BLK, AND NHI LEADS SHORT AND CONNECT AS SHONN ( DO NOT TNIST wITH OTHER LEADS >
INSTALL FERRITE BEADS AS CLOSE AS POSSIBLE T0 J1 PINS FOR BEST FM & UHF REJECTION
CONNECT PIN 1 OF EACH XLR To METAL ENCLOSURE AS DIRECTLY AS POSSIBLE ( SHORT HEAUT GAUGE NIRE )
wHITE NIRE IS CONNECTED TO TRANSFORMER CASE ( CASE NEED NOT BE INSULATED FROM ENCLOSURE J
iensen 93074
01/14/98

7135 HQYUENHURST QUE.

UAN NUYS. CALIFORNIA SI4OS
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