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FURNISHED ACCESSORIES
Preamplifier (SM93) ..................................................... 90A4360
Black Windscreen (WL93, SM93) .............................RK355WS*
Black Tie Clip Assembly (WL93, SM93) ....................RK354SB*
Dual Black Tie Clip Assembly (SM93) ........................RK307DB
Tan Windscreen (WL93T) ..........................................RK304T**
Tan Tie Clip Assembly (WL93T)..................................RK304T**
Black Sew-on Mounting Bracket (WL93, SM93) .......... 65B1733
Tan Sew-on Mounting Bracket (WL93T) .................... 65B1733A
Zippered Carrying Bag ..................................................... 26A13
*Replacements furnished in multiples of 4.
** RK304 includes 2 tie clips and 2 windscreens.
OPTIONAL ACCESSORIES
In-Line On/Off Switch ...................................................... WA360
CERTIFICATION
Eligible to bear CE Marking. Conforms to European EMC Directive
89/336/EEC. Meets applicable tests and performance criteria in
European Standard EN 55103 (1996) parts 1 and 2, for residential
(E1) and light industrial (E2) environments.
27 mm
(1–1/16 IN.)
NOTES:
1. ALL RESISTORS 5%,1/8 WATT, UNLESS OTHERWISE SPECIFIED.
2. ALL NON–POLAR CAPACITORS IN
UNLESS OTHERWISE SPECIFIED. POLARIZED CAPACITORS SHOWN IN
3. D.C. VOLTAGES MEASURED WITH 11 MEG INPUT VOLTMETER; A.C. VOLTAGE MEA-
SURED WITH 1 MEG INPUT VOLTMETER. VALUES SHOWN ARE TYPICAL AND MAY
VARY ± 20%.
4. THE FOLLOWING SYMBOLS DENOTE:
CIRCUIT BOARD GROUND
CASE GROUND
5. POWER SOURCE IS 21 VDC THROUGH TWO 1.691 KOHM, 1% RESISTORS FROM
SUPPLY TO PINS 2 AND 3 OF CONNECTOR P1.
98.8 mm
(3–29/32 IN.)
SM93 PREAMPLIFIER
C
RED
C3
33X6.3
R4
P2
360K
.1V
1
3
C7
4
1.9V
.047,5%
B
2
BLK
C6
.047,5%
C8
150 pF
GRN
A
µ
F, TOLERANCE 10% AND 50 VOLTS OR MORE
A.C. VOLTAGE
D.C. VOLTAGE
SM93 PREAMPLIFIER CIRCUIT DIAGRAM
+10
0
–10
20
18.8 mm
(3/4 IN.)
OVERALL DIMENSIONS
FIGURE 5
4.1V
R2
33K
Q2
Q1
86A350
86A348
3.5V
.6V
R1
R5
C5
62K
150 pF
R6
24K
WHT
BLK
GRN
µ
F x VOLTS.
FIGURE 6
3
2.2 F
3
1
20 K
4
2
+5V
TEST CIRCUIT
FIGURE 3
SM93
50
100
200
500
1,000
Hz
TYPICAL FREQUENCY RESPONSE
FIGURE 4
0.37 IN
(9.40 mm)
0.23 IN.
0.24 IN.
(5.84 mm)
(6.10 mm)
SM93/WL93 MICROPHONE
D1
86B429
.1V
.05V
D2
86A415
L1
2
C1
150 pF
1
C2
L2
3
150 pF
YEL
BRN
.05V
6. INPUT SIGNAL OF 0.1V AT 2 KHZ
T1
APPLIED TO CIRCUIT BELOW:
.1V
V out
2,000
5,000 10,000 20,000
0.15 IN.
(3.81 mm)
P1
1
2
3
18K
C
10x10
B
1.2K
A
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