Note on Schematic Diagram:
• All capacitors are in µF unless otherwise noted. pF: µµF
50 WV or less are not indicated except for electrolytics
and tantalums.
• All resistors are in
Ω
and
1
/
4
W or less unless otherwise
specified.
• % : indicates tolerance.
•
C
: panel designation.
• Signal path.
F
: MIC
SECTION 2
DIAGRAMS
2-1. SCHEMATIC DIAGRAM
ECM-R300
— 3 — — 4 —
1
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13
C7
220p
C3
56p
C14
22p
C15
220p
C16
680p
C17
0.1
C10
0.0022
C9
0.022
C11
C19
0.22
C8
0.022
C4
0.22
C6
1
C5
1
Q1
SSM2000
NOISE CANCELER
C20
1
R12
10k
R6
1k
R10
47k
R1
3.9k
R9
47k
R3
22k
R2
10k
R4
300k
R7
62k
R8
390k
R5
510
R13
1M
R14
680
R15
680
C21
1
C22
1
S1-2
S2-2
S1-1
nR
ON
OFF
C26
0.022
LOW HIGH
D6
1SS387
R16
100
D3
RB411D
3
2
1
D4
SML-310LT-T86
L1
220
µ
H
C24
220
4V
C25
33
4V
C18
0.47
6V
C23
33
10V
+6.0V
NC
NC
C13
3.3
C12
4.7
Q3-2
NJM2132
AMP
Q2-2
NJM2132
AMP
Q2-1
NJM2132
AMP
Q3-1
NJM2132
AMP
7
8
5
6
4
7
6
5
S2-1
C1
0.22
C2
0.1
HIGH
LOW
1
4
2
3
8
D5
015AZ4.7
D1
1SS352
D2
1SS352
D
S
L IN
R IN
VCF DET IN
ACOM
V+
VCF CAP
L VCF C1
L VCF C2
R VCF C1
R VCF C2
VCA CAP
VCA DET IN
SUM OUT
VCA PORT
HUSH ON
Q4
XC6371A601PR
1
2
3
3
3
3
3
3
6
3
nR
ON
OFF
SENS
SENS
1.8
6
(nR)
DC/DC CONVERTOR
DRY BATTERY
SIZE "AA"
(IEC DESIGNATION R6P)
1PC, 1.5V
MINI
PLUG
TOTAL CURRENT
0.21mA
THRES
DEFAULT
L OUT
MICROPHONE CAPSULE
(C-1053)
3
3
3
3
3
3
6
3
3
3
3
3
6
3
3
4
3
4
0
3
3.2
3
3
3.2
0.3
AMPLIFIER BOARD
16
0.01
w w w . x i a o y u 1 6 3 . c o m
Q Q 3 7 6 3 1 5 1 5 0
9
9
2
8
9
4
2
9
8
T E L
1 3 9 4 2 2 9 6 5 1 3
9
9
2
8
9
4
2
9
8
0
5
1
5
1
3
6
7
3
Q
Q
TEL 13942296513 QQ 376315150 892498299
TEL 13942296513 QQ 376315150 892498299
