M621-621T - 20W Monitor Amp

20W MONIT OR AMPL I FI ER
MODEL 1'1621 /11621 T
Des 19ned & Man ufac t u r ed
By
WARO- BECK SYSTEMS L1M1TEO
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Mod e l M621/M621T
20W Monitor ....mplifier
I NSTRUCTION MANU....L
1.
cirauit Desari ption
Teahnical Data M621
3.
Teahnica l Data M621T
Amplif i e r Ad justments
s,
DC Voltage Chart
6.
Parts list
7.
Draw ings
7 .1
Moni tor J\.mplifie r Schematic B6 21 - 02-003 ,
7 .2
Monitor Amplifier PCB Schemat ic B173 -02-001
7 .3
PCB Layout , B173-06-001
7.4
Mon i tor Ampl ifie r System Wiring, B621 - 02- 0 02
Mod ule La y out. B62 1 -06-002
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1Mode l M62l/M 62 1 T
20W Monitor Amplifier
CI RCUI T DESCR IPTION
Input circuit.
r
P2, pinEl 6 and 8 .
To p rotect the amplifier from e xc es s i ve signa l vo l tages, the
input is shunted by t he ' ov e r d r i v e p rotec tion c i r c ui t ' fo rme d by
m.,
car .
CR2 lind R2 .
The two operational amp lifie rs ZlA and ZlB operate in the
i n v e r ting mode .
The f e e db a c k r e s i s tor s R5 . R7. Re. RI J a nd R14
set the gain of ZlA .
Like wi s e . RG, Rll and Rl 2 determi ne the gain
of Z1B .
Th e gain of these two ampl ifi er a is l owe r e d by 20 dB whe n
the modu l e connector p2 . p imJ 6 and 14. as well as pins 7 and 15
a re strapped together .
The output of ZlA is connected to the i n v er ti ng i n p u t of
Z2 through RlS. whi le t h e output of Zl B connects to the no n- i nve r t i ng
i nput of Z2 via RIG .
Thus, zz provides a differentia l input to the
i ncoming signal and changes the balanced opera tion t o an unb ala nc e d
one .
Whether the i n pu t s o urce impe"ance is balanced or unb ala nc e d,
the signal le vel out of Z2 will , for like input l e vels fran e ithe r
kind of source , remain constant .
Differentia l Ba la nce Controls .
R13 is t h e hig h gain "iffe re ntia l balance c on trol , and Rla
is the low gain differential balance c o ntrol.
e ll i s a hig h
frequency different ial balance control , and shou ld b e adj ullted when
t h e ampl ifier is strapped f o r h igh ga i n opera tio n .
Ga in Control.
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The output of zz is c o u p l e d through C16 to t h e fron t panel
gain cont rol R23 .
This gain control can be an external one, and
can be l oc a t e d up to 20 feet frexn the amplifier .
Co n nection s fo r
the external g ain control a re mad e via the modu l e connec t o r P2, p ins
1 3 and 5.
The wipe r arm of the internal or the e x t e r na l gain
control is connl!'!cted to the input of the power amplifier vi a the
contacts of t he muting relay xi ,
The schematic d iagram shows Kl
connected to the +3 0 V rail through R24 .
Depending on the interface
t o o ther external control systems , i t may b e ne c e s s ary to operate
from a negative s upply .
In that c ase , R24 should be connected to
the - 3 0 V ra i l and the suppressor diode CR3 reve rsed .
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The balanced input to the amplif ier is v i a module c o n ne c t o r
Drivel:' and outPUt Stages
ZJ an4 i t s associ ated components fOl:'m the pa..>el:'
amplifiel:' dri ve l:' stage. The output fl:'OllI t he dr Lv ez- is
coupled thx'ough RS and the biasing diodes CRS and CR6 to
the ou t put powel:' t l:'a ns i s t ors. 05 and 07 fOl:'m the uppe l:'. and
06 a nd OS t h e Lowe I:' half of the cOtnplimental:'y powel:' output
sta g e.
The ouput signal is t a k en f l:'om the junct ion of R60
and R6l . and xout.ed via Ll to the module ccaneeecr Pl,
pin L
The feedback loop fol:' the ou~put stage connects to
the s ame junction. Th e ga in of the powe r- output stage is
de t el:'mi n e d by the c at. Lo of R J 7 to RJS .
Low
Pass FilteX'
RJO to RJ J. C20 and c2 l form an active low pass filter
wh i c h limits the bandwidth of the amp lifier to a p pr ox i mat e l y
JO kHz .
OJ and 04 limi t the o utp.lt powe r of the amp lifier to
a s afe l e vel should the load i mpe da nc e become t oo 10'0/ for
a var iety of r e a s o ns.
PO'o/er Su pply and Regulator
The ampl ifie r ope r a t e s f r om nominal ly +JO a nd -:-J O VDC.
These DC v o l t a ge s a r e deri ved f rom the .a.c line via Tl and CR9.
CJO am cJI f i lter the output f l:'om the bl:' i dge rectifier CR9 .
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0 1 and 02 . toge ther wi th CR4 . form a .:!:: 1 8 V l:'e gu l a t OX'
for the s u pp l y o f r egu l ate d DC t o t h e low powe r stag"s i n t he
amplifie r .
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Model M621
20W Monitor Amplifier
TECHNICAL DATA
4 3 or 63 dB matched gain (condi tional frame
strap) . Front pane l variable co ntrol.
FREQUENCY RESPONSE :
±.0 .25 dB from 20 Hz to 20 kHZ
80 dB below 20 W
'l'QTAL HARMONI C DIS'l'QRTION:
l e s s than 0 .25% from 20 Hz to 20 kHZ
mea s u r e d at 20 W output l ev e l .
- 20 dBtn nomina l, 0 dam maximum
dam nom i na l , +18 dBll'l maximum
o
(6 3 d B gll.in )
( 4 3 dB ga in)
LONGITtlOINA L BAlANCE:
greater than 60 dB
SOURCE IMPEDANCE:
600 Ohms or less , balanced or u nba lanced
INPUT IMPEDANCE:
LOAD
IMPEDANCE:
20 kOhms
8 Ohms nominal . 4 or 16 Oh1ll$ wi th appropriate
power output correction .
OUTPUT IMPEDANCE:
leas than 0 . 5 Ohms
POWER REQUIREMENTS :
11 5 VAC, 60 HZ, 60 VA
the low termina l number of the i nput pair is
i n phase with the di rect output t e rmi n a l.
AMBI ENT TEMPERATURE:
5 . 1w x 3 . 4H x 13 .7D i nches
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DIMENSI ONS:
Model H6Z1·T
ZOW Monit or AlIl p l if ie r
TECHNICAL OATA:
GAIN:
42 Dr 62 lIa t c he d ga in (c on diti on al )
Fr ont pan e l va r h bh!
ga tn st ra p ).
c ontro l.
FREQUENCY RESPONSE:
Wit h ln I dB 30 Hz to 15kHz .
NOISE:
80 dB b elow ZOW.
TOTAL HARMONIC DISTORTION:
Less tha n O.ZSI fr oll 50Hz t o
20Hz lIe n ur e d a t 20W ou tpu t t evet .
INPUT LEVEL:
- 20 dBIl no. i na 1 0 dh lIax. (6ZcIl gain)
OdS. nOll t nal +18 dBIl Mn. ( 4ZdBgain)
LONGITUDINA L BALANCE:
Gr ute r t han 60dB.
SOURCE I MPEOENe E:
60 0 oh lls Dr le ss . ba la nce d or
unb a la n c ed.
INPUT IMPEDENC E:
20 1: 0tll1S.
LOAD I MPEDENCE:
4 ,8,1 6 , I SO, or 600 01111$
( co nd it lo na l tran s for ller s t ra ppi ng)
OUTPUT (JIIIPEDENCE:
Le ss th an 1/5 lo a d IIl pedence.
PHASI NG:
The l ow t e ,.,l1na 1 n Ullber o f t ile
i npu t pai r is in ph ase with the
l ow te r llina1 nUMber o f tile output
tran sfo r ller strappi ng con fi gurati on .
POWER REQUIREMENT S:
llSV ac 60VA.
AMBIENT TEMPERATURE:
00 to 60°C.
DIMENSIONS :
S . l W x 3 .4H
WE IGHT:
6 1bs . ne t .
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AMPLIFIER AOOUS1'MEm'S
1.
Longi t uC!i na l Ba lance AC!1u e t men t
Suap t he aillpl itier t o r low gain a nd. a pp ly a signal.
Ad j ust the input a i qnal level f or a c on venie nt ou t pu t le vel.
Th is ou t pu t l e v e l wi ll be the r eference le~l f or the fol l o.rinq
adju.ebDen t a .
Tie pins 8 . nC! 16 on the flIOdule c onnector P2 t ogether
a nd apply the same s ignal volta ge between t his junction and
g round . Th e i n pu t s igna l is nOW' longitud i n ally applie d.
Adj us t R18 • 2 00 Hz f o r mi n im.ua output .
s hou l d be better than 6 0 dB down .
Th e output
Strap the alllpHf i er t or high 9ain a nd r e Cluce the input
l ev el by 2 0 dB.
Ad jus t R13 for mn imum ou t pu t a t 200 Hz .
Repeat both s te pe a t least tw ice, s i nce there is some
interaction between the contro ls .
With the amplifie r strapped for high 9ain , change t h e
input frequency t o 1 0 :kHz and adj us t e ll for mi n illlU18 output .
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The adjustments ahou ld res u lt in an ov er-a ll common
moile re j e ction of 60 dB or greater from 6 0 Hz to 6 ltHJl: .
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Model M621/M62 1T
2 0W Monitor Amplifie r
DC VOLT1>.GE CHART
The fol lowing DC vo ltages a re typic a l and may va ry +l ~ .
The idle cur r en t should be between 35 and 4 5 IlIA.
At 20 wat ts
output the c ur rent drain should be I A.
This can be convenient ly
measu red by r ectOVi ng fuses Fl and F2.
The vo ltmeter us e d f or the mlllllsurementl . should have III
stnuitivity of 20 .000 Ohma pe r vol t .
I ntegrated circuits .
Pi ns
-17.5
Z1
+1 7. 5
Pins
Z2
-17 .5
0
+17 .5
Z3
-17 .5
0
+17.5
Tr ansistors.
Elni.t t e r
01
+1 7 .5
. ,B
02
- 17.5
-1B
03
+0.'
04
-0.6
0'
+0.'
+31. 5
Q6
-0.'
-31.5
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Mod el M621 /M62lT
20 W Mo ni tor Amplifi er
" 6 2 1/ " 62 1-T
SYMBOL
DESCRIPTION
C1
22
22
22
22
10
C2
C3
C4
C5
C6
C1
C8
CO
CIO
C11
Cl2
CI3
C14
C15
C16
Cl7
C18
C19
C20
C2l
C21
C23
CZ4
'"
PART NUMBER
Ke.e t
Ke. et
Ke lle t
Kemet
Er ie
T362 -C226-02:5A5
T362- C225-02 5AS
T36 2 -C2 26 - 02:5A5
T36 2-C2 26-025A5
810 1-100 -COGO- I OOK
68 00 pf d . 10 0Y
6800 p fd. 100Y
10 pfd. 100V
10 pf d. 100Y
10 .fd, 25Y
Er ie
Er ie
Er ie
Ke.et
8 12 1- 100- W5RO - 682J
8121 -10 0- W5RO -682J
8101 - 100-CO&0-1001::
8101 -100-CO&0 -1001::
T362-8106 -025A5
5 t o 60 pfd . Var ia b le
330 pf d , 100 Y
22 ptd . 10 0V
3 3 pfd, 100V
S . D. T. f acto ry Se l ec t
Phi li ps
Erie
Ph i lip s
Er ie
COI OGA/6 0E
BI I I - 100- WSR O- 33 1K
22 22-6 38- 5822 9
812 1- 100 - COGO-3301::
47 .fd. 20'
10 . fd . 25Y
S. D. T. fac t or)' Se lec t
10 lllfd, 25Y
220 p f d , 10 0Y
Ke . e t
Kellet
T362 -C4 76-0Z0A5
T36Z- BI 06 - 0ZSA5
Kellet
Erie
T362·B I 06 - 02SAS
8 101- 100 - WSRO- 220
100 pfd , 100 V
10 0 1lfd. 35V
ZZOp f d . 10 0 Y
lSpfd . 10 0 Y
Er ie
Si eme ns
Er ie
Erie
8 11 1- 100 - WSRO - IOZK
EBI OO/3 SV
8 10 1- 100- WSRO -22 0K
10 10 - 100-COGO- lS0K
Kellet
. f d.
1lfd .
mf d,
mfd.
pf d ,
25Y
25Y
25Y
25Y
100V
Er te
C25
C33
C35
1362-BI 06-02 5" 5
EBI0017 5V
136 2-8 106-02 5"5
C344CH/ A150 K
CGSHZ2 U040B Ol
4 200 1lf d. 40V
10 p fd , 10 0 Y
6800 p fd, IOOY
6800 p f d. 100Y
47 .fd 20Y
Mill l o r y
Er ie
Er ie
Erie
Kelle t
CG2422U040BOI
8101 - 100 -CO&0-1001::
B121-100 - VSRO-682J
B121- 100 - W5RO - 682J
1362 -C47 6 -020A5
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Phili ps
Mlll1 0 r y
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C30
C3Z
10 .fd. 2 5Y
100 .td. 35V
10 1lfd. 2SY
O. lS lIIfd . 100V
4200 mf d . 40V
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C21
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REPLACEABLE PARTS
[-
REPLACEABLE PARTS
M621JM621T
PART NUMBER
SYMBOL
DESCRIPTION
CRI
CR'
CR'
CR4
CRS
Diode Zener 5%
Diode zener
Diode
Diode Zener 5%
Diode
CR'
CR7
CRB
CR9
Diode
Fairchild
I/R
Diode Bridg-e
Motorola
IN914
IN 4003
IN4003
MDA-980-4
D51
Ne on Lamp Assmy .
A~co
BNF-2
PI
F2
P'
Fuse
Motoro~a
Fairchild
312 -004
312-004
313 .002
Amp F .B .
Fuse 2 Amp . S .B .
Fu s e Holder
342004
. 2C 24V DC
A2425
Inductor
5 micro hen ry
Printed Circuit Board
for M62 1
M173
PI
P'
PO
Mo~ule P: ug-
AmPh~nOl
P .C . Socket
El c o
01
0'
0'
04
05
Tr a n sis t or
Motoro l a
26 -159-16
26 - 159- 16
00-6007-0 22 -940-002
Fairchi ld
2N403 7
2N3 79 ~
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2N3 71 5
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RCA
Motorol a
Motorola
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2N4923
2N4 92 0
2N3569
2N36 45
2N21 0 2
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I N7 5 7 - A
IN 57-A
IN400 3
IN4753 -A
IN914
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RE[>LACEABLE [>ARTS
M62l1M6 21 T
rPART NUMBER
826
R27
R28
R29
830
831
832
R33
83 4
R35
836
R37
R38
R39
R40
12K
15 K
l.lOK
100
10 0
l20K
1 5K
20K Pot
62P
4 7K
22 K
22K
22K
5K po t
Beckman
620
S .O .T . Factory Select
30K
S . O.T. Fa c t or y Select
5K Pot
470 ~
2 ,2 K
S .O .T. Factory Select
4. 7 K
S .O .T . Fac tory Select
15K
10K
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R21
R22
R23
82 4
R25
12K
1.5K
2.2K
22K
ps
R16
R1 7
R18
R19
820
All resistors l:{w
5% unless specified
o t herwi se
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R11
R12
R13
R14
R15
lOOK
lOOK
Philips o r
Allen
Br adley
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R6
R7
R8
R9
R10
lK ohms
1K
2.2K
2 .2K
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R1
R2
R3
R4
R5
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P2
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IN P UT
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2
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PCB
17 3
S TRA P TOGET HER
c OR LOW GA I N
S TR A P TOGETH ER
FO R L OW GA I N
12
I NP UT AN D
REMOTE GAIN
SHI E L D
L EVE L
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NOTES
I. FOR SCH EMA T ICO F P CB
B 17 3-06-0 01
173 SEE
. 2 FOR COMP ONENT L AYO UT OF P C 8 H:3
SEE B 173-02- 0 01
3 . UNLESS SPEC IFIE D A L L RESIS TORS
ARE 1/ 4 WATT. TO LERA NCE t5't'o .
VA LUES A R E IN O H IIl S. (fi )
CA PAC IT OR VA LUES I N M IC ROFARAD S. ( JJF)
4. LAST COMP ONENT DESI GNATI ON S AR E
A S FOLL OWS:
C 34 , CR9, OS I. F3, 1I . Q 8 , R 6 4/ S I, T I.
5. FOR SYSTEM WIRIN G SEE B 6 21-0 2-0 02
F3
SWt
PI
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&0 HZ
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20 WATT MONITOR AMPLIFIER,
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'!4WATT, ! 5 10, VALUES
IloJ M ICI<O' FA~ADS.
LAST
COMeo",e.NT
STl>.rE.O, ALL
I~ O~N\5.
Re:.~I~TO~~
ARE:.
CAPAC.ITO~ VAL UES
DE.SIC,"'ATIOt.l':>:-
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