The power supply components for this amplifier are as follows and are expressed for TwoChannels.1 x Toroidal Transformer with a Core rating of 625VA. Primary windings are made to suit your local mains supply. Eg: for Australia One single primary winding with a 240VAC rating. For USA, 110VAC, 115VAC and I believe there is a 220-Volt AC mains supply in some areas of the United States. For the UK it would be 220 VAC to 240 VAC. The secondary windings are as follows.2 x 50 volts AC at full load. One 400 Volt 35 Ampere, bridge rectifier. 2 x 4.7K 5 Watt ceramic resistors Minimum filter capacitor requirements would be 2 x 10,000uf 100 volt electrolytic. Ideal capacity would be 40,000uf per voltage rail.

A suggested power supply schematic is shown below with the schematic ofThe amplifier.

1 2 3 4 5 6 7 8

A

B

C

D

87654321

D

C

B

A

Title

Number RevisionSizeA2

Date: 17-Feb-2004 Sheet ofFile: E:\Protel Projects\..\MOSAMP8.S01.sch Drawn By:

C1100uf

R3482 ohm

C5100uF 100v

C10100uF 100v

F25 AMP

F15 AMP

R23470

R21470

R22470

R20470

R280.22 Ohm

R300.22 Ohm

R310.22 Ohm

R290.22 Ohm

Q18IRFP9240

Q16IRFP9240

Q17IRFP240

Q15IRFP240

R1115k

C710pf

C9100uf

C8100uf

C61.0nF

Q5BC546Q4

BC546

ZD215v

Q1MJE340

C13330uF

R18470

R19470

R618K

Q14IRFP9240

Q13IRFP240

Q9MJE340

C410pF

R10470

C310nf

C22.2UF

R115k

R21K

R16470

R17470

Q11IRFP240

Q12IRFP9240

R146k8

R13100

R12100

R32k2

R52k2

R15100

Q8MJE350Q6

MJE350

Q3BC546Q2

BC546RCA1

Q7MJE340

C1118pf

R410k

ZD115v

Q10BD139

C12.47

R250.22 Ohm

R270.22 Ohm

R260.22 Ohm

R240.22 Ohm

R810K

R710k

R910 Ohm

P15k

D11N4004

R32100 Ohm

R33100 Ohm

D21N4004

R3547 Ohm

R3647 Ohm

R371k

R384k7

C14470nf MKT

C1510nf

C16100nf

R44330k

R4082k

R411k

R43100k

R455k6

R421m

Q19BC546

Q20BC556

LD1

Anthony.E.Holton

Revised Schematic

-70 VOLTS

+70 VOLTS

(C)Copyright 1994-2004LAST REV.17/02/2004

ZD31N4737 or 9.1 to 15v

ZD41N4737 or 9.1 to 15v

T1

625VA 2x50 VAC secondary windings

BR1600V/35 AMP

E210,000uf 100v

E110,000uf 100V

E410,000uf 100V

E310,000uf 100V

SW1a

SW1b

Active 240VAC/115VAC

Neutral

Chassis Ground

+70 Volts

-70 Volts

Suggested Power Supply

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