ISSUE
DRAW NG NO.
DRAW NG TITLE
DA E
F lename:
ECO No DESCRIP ION OF CHANGE
L923TX_2.0.sch
C30 TRANSFORMER 115/230V
Contact Eng neer:
L923TX
11 Apr 2003
NI IALS
Printed: 1 1Sheet of
Notes:
Contact el: (01223) 203200Kevin Lamb
A & R Cambridge Ltd.
Pembroke Avenue
Cambridge CB5 9PB
Waterbeach
23425
BROWN
WHITE
BLACK
BLUE
115V ac
115V ac
PR MARY
6 WAY CONN PIN 1
6 WAY CONN PIN 4
6 WAY CONN PIN 6
6 WAY CONN PIN 3
C out
TEST CIRCUIT (PER OUTPUT)
I out
+VOUT
VOUT
6 way MOLEX 39 01-2065
PRIMARIES
65max
POTTING COMPOUND
Rubber insulating pad
1
5
2
6
3
4
7
8
RED
OR
YELL
GRN
BLU
VIO
GREY
WHITE
12
5
3
46
8 way6 way
Pin outs of Molex connectors
As viewed looking down at the end
the wires enter he connector
1
4
3
6
SCREEN W RE GRN/YELL
120mm dia max
AC IN
SCREEN WIRE
T ansformer Specfication For 115/230V C30 t ansformer
A cam Part Number L923TX
Material Safety Spec fication
1. Winding Wire to be Grade 2 (130C rating) to BS 60317 4 1995
2. Mylar Polyester Insulator 130C Rated
3. Pot ing Compound PC3502 E135297(M)
Mechanical Speci ica ion
1. Middle of transformer to be potted (as shown).
2. P imary windings connect to 6 way MOLEX connector 39 01-2065. Secondary
windings connect to 8 way molex connector 39-01-3088. Use MOLEX pin 44476-3112.
MOLEX connectors have pin numbers indicated on hem.
3. P imary wi es a e enclosed in a common sleeve. Secondary wires are enclosed in a common
sleeve.
Use PVC sleeving.
4. Al wire lengths in mm. Leng hs a e +5.0, 0
5. Please adhere rubber insulating pad to bottom of transfo mer as shown.
Electrical Specification
1. T ansformer to have dual 115V primaries to a low paralel operation for
115V input and se ies ope ation wi h 230V input.
2. Transformer input votage range
115V -18% +14% (97.5V to 132 5V)
230V -18% +14% (195V to 265V)
3. Transformer to have 4 secondary windings as show in he adjacent drawing.
4. Loaded DC voltages spec fied at 195V AC in wth t ansformer p imaries in series)
5. Each secondary winding to have a full wave (4diode) bridge to produce a single DC ra l. (AS
shown in diagram)
Output Capac tance is as indicated in table.
The spec fied voltage figure wth this input vo tage is to be the minimum votage on the reservoir
capactor as shown in the diagram.
6. The transfo mer is intended to be massively ove rated so as to p ovide ve y low esistance
windings for the VP24V7 and VN24V7 supp ies.
This wi l improve the audio qua ty of the equipment it is to be used in by allowing he flux density
to be very low and he wire guage to be la ger than would otherwise be he case. The sizes given
are maximum finished sizes.
There is no mert in a temp ing to reduce the size much below he maximum sizes spec fied. Audio
qual ty wil be improved by making he transformer as large as possble.
7. The VP46 and VP18 secondaries a e fused by T250mA Fuses.
The VP24V7 and VN24V7 secondary windings are unfused.
The transfo mer must be designed so hat a short on ether of the unfused windings wi l cause the
prima y fuses (2AT) to blow.
LEADS EXIT FROM TOP
P ototype Release
Voltage on Reservoir Capac tor
10mS
140mm
A.04-11-2002KAL
UL94- V0
Connector Latch
VOUT min
Rubber insulating pad to have
Clearance hole for M6 Bolt
Supply Load
Cu rent
DC Vo tage
Min *see diagram
Output
Capacitance
VP24V7
VN24V7
VP46
VP18
At 195V rms in
21 0V
21 0V
39 0V
15 0V
10,000uF
10,000uF
100uF
1000uF160mA
50mA
VP24V7
VN24V7
VP46
VP18
12
6
3
57
4
8
40mm
25mm
8 way MOLEX 39 01-3088
SECONDARIES
UL94- V0
100mm
200mA
200mA
Strip and tin 10mm
SECONDARY
200mm
GJ 4-03 03 1.0
Sc een wire length from 140mm to 200mm
or
8 way Conexcon 6740-1080
or
6 way Conexcon 6740-1060
Added Conexcon aternative connecto s
39 +/- 1 mm
2.0
Potting rasied to top of transformer
10 03-03GJ
P ting is counter bo ed to 39mm f om bo tom face of transformer
03_E110
03_E076
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