Transformer Specification for 100/115/230V 50/60Hz mains transformer (for audio)
Arcam Part Number L931TX
General Safety specification.
1.To standards BS415 / EN60065 - Class I / EN60742
2.Transformer to be used in equipment which will be sold worldwide and certified to CE, CB, UL and CSA Standards. All materials etc to be adequate for worldwide safety approvals.
Material Safety Specification
TOP VIEW
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| Ferrite core WURTH 74270062 (or |
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| Secondary wires pass through ferrite. | |
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| Heatshrink tubing fitted over ferrite, but |
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| not firmly to cable, so that ferrite is free to |
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| move along cable |
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3.Winding Wire to be Grade 2 (130°C rating) to BS
4.Mylar Polyester Insulator Rated to 130°C
Electrical Specification
5.Transformer to have dual 115V primaries to allow parallel operation for 100/115V input and series operation with 230V input.
6.Transformer to have 2 secondary windings as shown in the adjacent diagram.
7.The output from the secondary windings are to be full wave rectified and smoothed as shown in the 'test circuit' diagram.
8.Transformer input voltage range as follows:
115V: (85V to 132.5V) windings in parallel
| SECONDARIES |
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| 4 way MOLEX |
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| FERRITE |
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| PRIMARIES |
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| 400MM, +20, |
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TEST CIRCUIT
6 way MOLEX
6 | 5 | 4 | 4 | 3 |
3 | 2 | 1 | 2 | 1 |
| 6 way |
| 4 way | |
230V: (170V to 265V) windings in series
Note. Extended input voltage range 85V to 265V
9. At minimum input voltage (170V AC with primaries in series) and maximum load of 120mA the minimum voltage on the |
capacitor must be = (or >) 13.5V. |
10. Temperature rise to be such that transformer is safe when operated in an enclosure with 50C maximum internal |
PRIMARY
6 WAY CONN PIN 1 BROWN
SECONDARY
RED | 4 WAY CONN PIN 2 |
General Instrument / Vishay | +VOUT | |||||
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temperature. |
Mechanical Specification
11. Primary windings connect to 6 way MOLEX connector
windings connect to 4 way molex connector
MOLEX connectors have pin numbers indicated on them.
12.Use 24 AWG wire with colours as shown. Primary wires are enclosed in a common sleeve. Secondary wires are enclosed in a common sleeve. Use PVC sleeving.
13.Transformer to be marked with Arcam part number and issue number.
14.Transformer is for
15.Transformer to be supplied with mounting kit consisting of metal dished washer and 2 neoprene or similar washers.
115V ac
| 6 WAY CONN PIN 4 | WHITE |
| 6 WAY CONN PIN 3 | BLACK |
115V ac |
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| 6 WAY CONN PIN 6 | BLUE |
ORANGE | 4 WAY CONN PIN 1 |
YELLOW | 4 WAY CONN PIN 4 |
GREEN | 4 WAY CONN PIN 3 |
W02G |
W02G |
3300UF
3300UF
120mA load
0V
120mA load
-VOUT
Voltage on Reservoir Capacitor
+VOUT_min
Minimum output voltage specified at: Min input voltage
Max load (see text)
0V
65mm max
LEADS EXIT NEAR TOP max40mm
| DRAWING TITLE DV29 AUDIO TRANSFORMER |
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| 04_E107 | PG | Add 20mm to all lead lengths, ferrite free to move on cable | 1.1 | ||||||
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| Filename: L931TX_1.1.sch |
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| 04_E087 | PG | Production release. Add ferrite core to secondary cable | 1.0 | ||||
| Notes: |
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| 04_E048 | PG | Reduce specified output voltage to 13.5V at 120mA | A.1 | ||||
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| A & R Cambridge Ltd. |
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| 04_E034 | PG | Prototype Release |
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| A.0 | |
| Pembroke Avenue |
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| ECO No. | INITIALS | DATE | DESCRIPTION OF CHANGE |
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| ISSUE | |
| Waterbeach |
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| Cambridge CB5 9QR | Contact Engineer: Peter Gaggs | Contact Tel: | (01223) 203270 | Printed: | Sheet 1 of 1 | A3 | DRAWING NO. L931TX |
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