Arcam C30 - Page 27

ISSUE
DRAWING NO.
DRAWING TITLE
DATE
Filename:
ECO No. DESCRIPTION OF CHANGE
L922TX_1.0.sch
C30 TRANSFORMER 100V
Contact Engineer:
L922TX
13-Oct-2003
INITIALS
Printed:
1 1Sheet of
Notes:
Contact Tel: (01223) 203200Kevin Lamb
A & R Cambridge Ltd.
Pembroke Avenue
Cambridge CB5 9PB
Waterbeach

BROWN
WHITE
BLACK
BLUE
100V ac
100V ac
PRIMARY
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/Conexcon connectors
As viewed looking down at the end
the wires enter the connector
1
4
3
6
SCREEN WIRE GRN/YELL
120mm dia max
AC IN
SCREEN WIRE
Transformer Specification For 100V C30 transformer
Arcam Part Number L922TX
Material Safety Specification
1. Winding Wire to be Grade 2 (130C rating) to BS 60317-4 1995
2. Mylar Polyester Insulator 130C Rated
3. Potting Compound PC3502 E135297(M)
Mechanical Specification
1. Middle of transformer to be potted (as shown).
2. Primary 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 them.
3. Primary wires are enclosed in a common sleeve. Secondary wires are
enclosed in a common sleeve.
Use PVC sleeving.
4. All wire lengths in mm. Lengths are +5.0, -0
5. Please adhere rubber insulating pad to bottom of transformer as shown.
Electrical Specification
1. Transformer to have dual 100V primaries to allow parallel operation for
100V input.
2. Transformer input voltage range
100V -15% +15% (85V to 115Vrms)
3. Transformer to have 4 secondary windings as show in the adjacent drawing.
4. Loaded DC voltages specified at 85V AC in (with transformer primaries in
parallel)
5. Each secondary winding to have a full wave (4diode) bridge to produce a
single DC rail. (AS shown in diagram)
Output Capacitance is as indicated in table.
The specified voltage figure with this input voltage is to be the minimum voltage
on the reservoir capacitor as shown in the diagram.
6. The transformer is intended to be massively overrated so as to provide very
low resistance windings for the VP24V7 and VN24V7 supplies.
This will improve the audio quality of the equipment it is to be used in by
allowing the flux density to be very low and the wire guage to be larger than
would otherwise be the case. The sizes given are maximum finished sizes.
There is no merit in attempting to reduce the size much below the maximum
sizes specified. Audio quality will be improved by making the transformer as
large as possible.
7. The VP46 and VP18 secondaries are fused by T250mA Fuses.
The VP24V7 and VN24V7 secondary windings are unfused.
The transformer must be designed so that a short on either of the unfused
windings will cause the primary fuses (2AT) to blow.
LEADS EXIT FROM TOP
Prototype Release
Voltage on Reservoir Capacitor
10mS
140mm
A.04-11-2002KAL
UL94- V0
Connector Latch
VOUT min
Rubber insulating pad to have
Clearance hole for M6 Bolt
Supply Load
Current
DC Voltage
Min *see diagram
Output
Capacitance
VP24V7
VN24V7
VP46
VP18
At 85V 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
39 +/- 1mm
8 way MOLEX 39-01-3088
SECONDARIES
UL94- V0
100mm
200mA
200mA
Strip and tin 10mm
SECONDARY
220 mm
GJ 15/05/03
ECO 03_E137 -Screen lead lengthen to 220 mm
Conexcon connector added, potting filled to top of TX
or
8 way Conexcon 6740-1080
or
6 way Conexcon 6740-1060
UL94- V0
UL94- V0
B.0
Production Release 1.013-10-2003SLS