mxl MXL MCA-SP1, Studio Projects B1, Fame Studio CM1 Schéma des mods du MCA-SP1 (zapnspark)

0

A A

Mic. Capsule

B B

C C

D D

red black

white

R5

1 G 1 G

(remove)

C9

(move)

22nF

(remove)

C4

1.0nF

R9

1.0M

Ω

R6

C11

1

(move)

*

*

G

R7

330k

Ω

(changed)

R10

680k

Ω

(changed)

D

S

2

R2

2.2k

Q2

J305

R11

2.2k

Ω

9.2 V (+-0.2 V)

(changed)

2.8 V (+-0 .2 V)

Ω

3

red

~ +12 V

R12

1.5k

50 V Plastic Film

C5

220uF-POL

16 V

50 V Plastic Film

Ω

4

C1

330nF

R4

6.2k

C10

330nF

5

R3

150k

Ω

~ +38 V

Ω

C6

47uF-POL

50 V

R8

150k

Ω

6

(changed)

C3

1.0nF

50 V

C7

1.0nF

50 V

(changed)

Q1

BC559C

Q3

BC559C

7

D1

1N4735A

6.2 V

D2

1N4735A

6.2 V

8

R1

20

Ω

C2

22nF

50 V

C8

22nF

50 V

R13

20

Ω

(XLR2 & XLR3 wires swapped)

red

(changed)

black

(changed)

white

XLR3

XLR1

XLR2

D3

E E

1N4148

F F

22nF

C12

1.0nF
50 V

1N4148

C15

6.8pF

D4

R14

750k

Q4

2N5551

~ +6.8 V

C13

Ω

27pF

50 V

C14

220uF-POL

16 V

D5

1N4735A

6.2 V

D S G EBC

NOTES: See GenChinaMic.pdf file for original schematic
* See file BiasingFETs.pdf to determine exact R7 and R10 values
J305 D and S leads are interchangeable

BC559CJ305

2N5551

E B C

L1

Title:

150uH

L2

62uH

G G

0

1

2

3

4

Generic "China" Condenser Microphone Modifications (MCA SP-1)

ZAPNSPARK
Designed by:
Checked by:

Approved by:

5

Jim G.
J.G. 18:53:02

J.G. 18:53:02

6

Document N:
Date:

Sheet of

0001

2008-09-30
1 1

7

Revision:
Size:

8

2.8

A