Fairchild Integra II Series User manual

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FAIRCHILD
DOUBLE
AMPLIFIER
CARDS
---
MODEL
692AD
-
692AD/TXI
INTEGRA
II
SERIES
1B692AD/268
INSTRUCTION MANUAL
-
AIRCHILD
SOUND
EQUIPMENT
CORPORATION
,
10-40 45th Avenue, Long Island City, N.Y. 11101 , 212 784-6163

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FAiiiCiiILD MODEL 692AD AHFLIFIZR CARD
DV
DESCRIPTION
The MODEL 692AD is designed to provide amplification for micro-
phone signals as well as boosting of signals up to levels of
+18dbm. This card can be used in stereo circuits or cascading
(one amplifier feeding the other).
The two sections of the card are completely isolated, providing
maximum flexibility for the system designer. The advantages
of the "package" are compactness of design, excellent performance
and economics.
- ERFORMANCE SPECIFICATIONS
GAIN•··•••·••·••·••·•••••··• Without transformer from 22 to
51 db, continuously variable
With input transformer, 36 to
66 db
FREQUENCY RESPONSE •.••••••••• From 20 to 20K, ± .5 db
DISTORTION (THD) •••••••••••• At +17.5 dbm out .35%
NOISE w/tlAX. GAIN .•..•••••••
POwER REQUIREMENTS••••••••••
Without transformer 128 db in-
put noise with open input
With transformer, primary shorted,
139 db input noise
24V DC at 6 ma maximum
I L 1-"'
INPUT Il'iPEDANCE ••••••••••••• Without transformer greater
than 100K
With transformer 200 ohms
OUTPUT IMPED.ANGE··••••••··•• 15 ohms (recommended load impe-
dance 150 ohms up, inductive or
non-inductive)
tlA.X. PO. / ER HANDLING CAPABIL-
ITIES • •• •• • • • • • •• • •• • • • •• +18 d bm
CIRCUIT DESCRIPTION
Both amplifiers on the 692AD card are identical. Each one is
capable of maximum output of +18 dbm. The amplifier is Class AB,
direct coupled, with minimum of 18 db of negative feedback. Out-
put stage is complementary symmetry circuit, using silicon tran-
sistors exclusively.
-

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NOTE :
I. UNLESS OTHERWISE SPECIFIED
ALL RESISTORS ARE IN OHMS, 1/4 W.
ALL CAPACITORS ARE IN MFD .
* RESISTOR VALUE TO BE SELECTED .
l l
T~om
220K
r
I C
~ 06
I 2N4010
I
,~t
I
l l
+lc ,o
{RIB
220K
1100/25
692AD AMP SCHEMATIC
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750PF
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%
05
2N4010
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t,,.
• R20
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470
2.2K
IOOK
-
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8.2K
. * G- 130
07
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RB
100
ISSUE : I
10-24-
0
67
2- THE VALUE OF Rl,R2 ,
R3 8 R4 WAS 3011.
ADDED NOTE.
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2 N36 38 I
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T 300/3
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OUT
r,,,
C5
+Tioo 115
+__Lc6
000/15
OUT
r.,
C7
+Tioo, ,5
+I CB
100/15
Rl2 ....L.Cl2
'J
s;:,
470 T 30013
Rl4 R24
2.2K IOOK
B-96284

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Each amplifier is decoupled from th e po we r su pp ly f or minimum
interaction. The power suppl y feedin g the amplifier card should
have ripple not higher than .5 mv rms for best S/N ratio.
Gain of the amplifier is controlled by means of a potentiometer
connected i n the feedback loop, ther e by reducing the distortion
of the amplifier as the g ain is decreased. A total of 29 db
of gai n control is accomplished in this manner.
Input transformers are well shielded and capable of accepting
levels as high as O dbm without overloading. Transformers
are mounted directly on th e card for minim um noi se pickup and
minimum
high frequency loss.
INSTALLATION
The 692AD card can be used in con j unction with the 692 series
remote control equipments in the 692RI1 rack mount, or it can be A
mounted separately usin g the 692SCH sin g le card holder (which W,
comes complete with card connector). Connections are made as
follows:
PIN 2 - Negative (-24V) amplifier g round LO side input
4 - Output
7 - Input - LO
8 - Input -HI
10 -+24 V
13 - Negative (-24V) second amplifier g round LO side
15 - Output (second amplifier)
19 - Input - LO (second amplifier)
20 - Input -HI (second amplifier)
22 -+24V (second 8.lilplifier)
Printed circuit board has provision for the two amplifiers to be
connected throu ~h a sin g le power connection. If desired, however,
the two am plifiers can be separated if they are to be fed from
different power supplies and maximum isolation between the two
amplifiers is desired.
PRECAUTION should be observed in locating the card in the
system. \,lb.en input transformers are mounted on the card,
the 692AD should be mounted as far as p ractical from any
strong magnetic field source. Regardless of the shielding
of the input transformers, there is a possibility of hum
pickup affectin g the overall performance of the amplifier
in the system.
A 'l'TACHl"IEN TS - Schematic dia gram 692AD -B96284
Dimension Drawing 692AD
WAR.JUNTY & SERVICE POLICY
See standard warranty policy attached to and forming part of
this manual. To validate warranty, complete and return th e -

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warranty registration card provided. If there is any question
on this, or any other FAIR CHILD professional product, please
contact the factory: FAIRCHILD SOUND EQUIPMENT CORPORATION,
10-4-0 45th Avenue, Long Island City, New York 11101.
When returning any FAIRC H ILD professional - ~roduct to the factory
for any reason, include a brief statement with the unit indicating
the reason for the return.
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