Krell Krell clone Schematic

+V

OPTIONAL

L201

Output

GND

R206

4R7

5uH

C201

100nF

R205

10R

-V

13.02.2005

1.5
of

11

1.3

SheetStatus

Released

21.10.2004

Date Date

Rev. Rev.

8 9 10 11

7

D201

OPTIONAL

Q3

2R2

RB 3

Output Board

R130

22K

MJL21194

RB 2

Q2

2R2

MJL21194

RB 1

Q1

2R2

MJL21194

Base

P. Output

Q109

RVI 1

MJE15032

RVI 2

RVI 3

Could be placed on speaker binding posts

0R5

Output

0R5

RE 1 RE 2 RE 3

0R5

0R5

Output

RVI 3

0R5

RVI 2

RE 1 RE 2 RE 3

0R5

Q1

MJL21193

Q2

MJL21193

2R2

RB 2

Q3

D202

OPTIONAL

MJL21193

2R2

RB 3

Checked

1.2

21.10.2004

Date

Rev.

Krell-Clone KSA-50.sch

17.10.2004

File Name

Rev.

Date

UR IP

JD

1.1

A3

R&D

Size Code

Dept. Drawn by

Output Board

RVI 1

RB 1

2R2

V-I

V-I

Base

www.delta-audio.com

Krell-Clone KSA-50

Krell KSA-50 Clone

DELTA AUDIO DENMARK

22uF

N.V-I

V-I limiterNegative

Q110

MJE15033

N. Output

Copyright

Project

Circuit Name

P.V-I

+

C301

22uF

Positive V-I limiter

R127

R301

Feedback

100R

R302

100R

+

C302

R128

25R

25R

6

12345

Main PCB

C107

100pF

D301

Q301

D303

MPSA42

C

C109

E

100nF

D305

D306

Q302

MPSA92

C108

100pF

D302

D304

Fitted on main heatsink

Q111

2SC3955

R122

101R

Q107

MJE15033

C105

Q103

2SC2240

Q101

2SC2240

R104

4K7

+

D109

GND

R103

R120

R116

R112

47K

C110

3K39

1K5

1K5

R108

1K5

10uF

16V

+V

B

R124

???

R125

820R

330pF

Q105

MPSA92

GND

R118

100R

R114

100R

R110

9K1

GND

ZD101

R131

22K

R105

5K

R101

1K

R102

Normal/Low BIAS

Q106

C101

MPSA42

680pF

22K

R119

R115

R111

100R

100R

9K1

R126

GND R144

GNDGND

5K

5K

R129

C106

Q104

2SA970

1K5

Q102

2SA970

R106

4K7

D110

Input

Q108

330pF

C102

+

MJE15032

1000uF

16V

C104

100nF

R109

1K5

ZD102

+

C103

C111

R123

R121

R117

1000uF

16V

+

R113

R107

10uF

GND

101R

3K39

1K5

GND

1K5

GND

47K

16V

-V

Notes!

Components designated 1xx are placed on main PCB

Components designated 2xx are placed on heatsink or speaker binding posts

Components designated 3xx are additional output protection circuits

All capacitors 100V exept where designated otherwise

Q111 must be placed on main heatsink

Q109 and Q110 must be fitted with suitable heatsink

V-I Limiter: 1: (RVI 1 / RVI 2 / RVI 3) = app. 100R for safe SOA

A

B

C

D

E

F

G

H