Heathkit HW-8 Schematics

8 0 M E T E R

R 3 1 4 7 E

1

F

L 1

111 14

2

1

4 0 M E T E R

L 2

11 14

2

1

2 0 M E T E R

L 3

2

1

1 5 M E T E R

L 4

2

1

M A X .

2

1

M I N .

C 5 2
5 0 n F

S W 1 A

S W 2 A

S W 3 A

S W 4 A

C 4 4
5 1 0 p F
N 1 5 0 0

1 2 3

3 . 5 M h z

2

1

3

7 . 0 M h z

2

1

3 11 14

1 4 M h z

2

1

3 11 14

2 1 M h z

C 4 5

C 4 6

5 1 0 p F

5 1 0 p F

N 1 5 0 0

N 1 5 0 0

C 4 7

C 4 8

6 , 8 p F

2 7 p F

N P 0

N 3 3 0

R F G A I N

C 4 9

C 5 1

5 6 p F

5 6 p F

N 7 5

N 7 5

T U N I N G

C 3 0 2 A C 3 0 2 B

6 , 2 - 1 7 , 2 p F

1G

8 . 6 4 5 - 8 . 8 9 5 M h z

B L K

R 7 8 1 K

C 1 1 5
5 0 n F

R 7 9 6 , 8 K

R 8 1 1 0 0 K

V 1
1 2 , 3 9 5
M H Z

D 2 2

T P

T H I S S Y M B O L I N D I C A T E S A T E S T P O I N T

T H I S S Y M B O L I N D I C A T E S A R E C E I V E - M O D E D C V O L T A G E
M E A S U R E D F R O M T H E P O I N T I N D I C A T E D T O C H A S S I S .

T H I S S Y M B O L I N D I C A T E S A T R A N S M I T - M O D E D C V O L T A G E
M E A S U R E D F R O M T H E P O I N T I N D I C A T E D T O C H A S S I S .

R F

T H I S S Y M B O L I N D I C A T E S A R E C E I V E - M O D E R F V O L T A G E

R X

M E A S U R E D U S I N G A N R F P R O B E C O N N E C T E D B E T W E E N
T H E P O I N T I N D I C A T E D A N D C H A S S I S .

R F

T H I S S Y M B O L I N D I C A T E S A T R A N S M I T - M O D E R F V O L T A G E
M E A S U R E D U S I N G A N R F P R O B E C O N N E C T E D B E T W E E N
T H E P O I N T I N D I C A T E D A N D C H A S S I S .

14

3

1

14

3

1

14

3

1

14

3

1

3

1

11

L 9

C 1 1 6
1 0 0 p F

R 3 0 2 1 K l i n

C 5 3
4 , 7 p F

C 1

C 3

6 8

8 - 6 0

R 1 1 K

C 2
5 0 n F

C 4

C 6

6 8

4 - 4 0

R 2 1 K

C 5
5 0 n F

C 7
8 - 6 0

R 3 1 K

C 8
5 0 n F

C 9
8 - 6 0

R 4 1 K

C 1 1
5 0 n F

Z D 1
9 , 1 V

V F O O S C I L L A T O R

R 3 2 1 M

L 1 7

D 2 3

C 3 0 1 A

D 1

D 2

Q 1

C 1 2
3 , 3 p F

D 3

D 4

R F C 1 3 5 0 u H

G

R 5 1 0 0 K

3 . 5 M h z 1 4 M h z 2 1 M h z

11

L 5

D 5

1 3 , 4

D

S

C 1 3
5 0 n F

R E C I E V E R P R E S E L E C T I O N

7

8

S W 1 C S W 2 C

9

B L K B L K

K K

C 1 4
5 0 n F

L 6

C 1 6
4 - 4 0

C 1 5
4 7 p F

0 , 9

D 6

R 6 2 7 0 E

+ 1 3 , 4 V

R 3 3 4 7 0 E

R 3 9 1 0 0 E

Q 3

C 5 4
3 , 3 p F

Q 2

D

G

D 3

C 1 1 7
5 0 n F

1 , 1 5

S

C 5 5
5 p F

R 3 4 4 7 0 E

R E D

R 8 2 1 K

R 8 3 6 , 8 K

V 2
1 5 , 8 9 5
M H Z

A L L V O L T A G E S M E A S U R E D W I T H A H I G H I N P U T I M P E D A N C E V O L T M E T E R .
V O L T A G E S M A Y V A R Y + 2 0 % .

A L L M E A S U R M E N T S O B T A I N E D U S I N G A P O W E R S O U R C E O F 1 3 V .

B A N D S W I T C H S H O W N W I T H 3 , 5 M h z P U S H B U T T O N P R E S S E D I N
A N D T R A N C E I V E R O P E R A T I N G I N R E C E I V E M O D E .

C I R C U I T C O M P O N E N T N U M B E R S A R E I N T H E F O L L O W I N G G R O U P S
1 - 1 9 9 P A R T S M O U N T E D O N M A I N C I R C U I T B O A R D
2 0 1 - 2 2 5 P A R T S M O U N T E D O N A F A M P L I F I E R C I R C U I T B O A R D
3 0 1 - 3 2 5 P A R T S M O U N T E D O N C H A S S I S

1 , 8

C 5 6
5 0 n F

R 3 5 4 7 0 E

R 3 6 1 K

D 1 1

C 1 1 6
1 0 0 p F

R 8 4 1 0 0 K

D 2 4

A L L R I S I S T O R S A R E I N O H M S 1 K = 1 0 0 0 1 M = 1 0 0 0 0 0 0

A L L C Z P A C I T O R S V A L U E S L E S S T H A N 1 A R E I N u F A L L A B O V E A R E I N p F
U N L E S S O T H E R W I S E I N D I C A T E D

R 3 7 2 2 K

R 3 8 6 8 K

D 2 5

1 2 , 2

1 , 1 2

L 1 1

C 5 7
5 0 n F

R 3 5 4 7 0 E

L 1 8

C 1 1 9
5 0 n F

V 3
2 2 , 8 9 5
M H Z

C 5 9
5 0 n F

R 4 2 1 0 0 E

G R N

R 8 5 1 K

R 8 6 6 , 8 K

R 8 7 1 0 0 K

D 2 6

7 . 0 M h z

R E D

L L

C 1 7
5 0 n F

C 1 8
7 5 p F

A

C 3 0 1 B

D 1 2 D 1 3

D 1 5D 1 4

L 1 2

C 5 1
1 0 0 p F

L 1 9

C 1 2 1
4 7 p F

D 2 7

7

8

9

R E D

C 1 9
4 - 4 0

S W 3 C S W 4 C

G R N G R N

M M

C 2 1
5 0 n F

L 7

C 2 2

D 7

8 - 6 0

4321

R 8 8 1 K

C 1 2 2
5 0 n F

R 8 9 6 , 8 K

V 4
2 9 , 8 9 5
M H Z

R 9 2 3 , 3 K

7

8

9

+ 1 3 V

W H T

L 8

D 8

R 4 4 4 7 K R 4 3 1 0 0 K

R 4 5 1 0 0 K

C 1 2 5
5 p F

C 1 2 6
1 0 p F

7

8

9

W H T W H T

N N

C 2 3
5 0 n F

C 2 4
8 - 6 0

B L K

R 5 0 1 0 K

C 5 9
5 0 n F

4

G 2

G 2

C 1 2 5
2 4 p F

R 9 1 1 0 0 K

D 2 8

Q 6

2 , 0 6

H E T R O D Y N E
O S C I L L A T O R

+ 1 3 , 4 V

C 3 0 5
4 7 0 n F

A F G A I N

6

R 3 0 1 1 O K

C 1 0 9
2 2 n F

O F F

S W 3 0 1

O N

L O G

5

4

1

P O W E R

2

5

S O C K E T

3

6

C 2 0 2
1 0 0 u F

R 2 0 1 4 7 E

+ 1 3

+

H E A D P H O N E S
J A C K

2

O U T

1

G N D

C 2 0 3
1 0 0 n F

1 , 3

C 2 0 4
2 u F

6 , 5

+

C 2 0 5

+

2 5 u F

R 2 0 5 1 K

Q 2 0 1

C 2 0 1
2 u F

R 2 0 2 4 , 7 K

I N

+

1 , 9

R 2 0 6 2 2 0 E

R 2 0 4 1 O K R 2 0 3 4 7 K

A F A M P L I F I E R C I R C U I T B O A R D

+ 1 2 V

0 , 3 5

R 7 2 3 , 3 M

S I D E T O N E O S C I L L A T O R

R 7 3 1 O M

R 7 4 1 0 M

1 2

1 1

5 , 8 2

R 7 5 4 7 K

C 1 1 1
1 0 0 n F

1 0

I C 2 D

1 1 , 3 8

R 7 6 1 K

C 1 1 2
1 0 0 n F

C C

C 1 1 3
1 0 0 n F

B B

R 3 0 1 1 O K

S I D E T O N E
V O L U M E

+ 1 3 , 4 V D C

B R E A K I N
D E L A Y

+

Q 1 2

E E

1 2 , 8 2

S O U R C E

+ 1 2 V D C
S O U R C E

C 9 2
1 0 u F

0

C 3 8
2 u F

M U T E

Q 1 4

R 2 8 1 0 0 E

C 4 1

+

1 0 0 u F

R 2 6 2 , 2 M

0 , 5

0 , 5

+

0

R 6 8 5 0 KR 6 9 1 K

R 7 1 1 0 K

1 2 , 5 8

1 2 , 7 4

A A

5 , 7 4

1 3

I C 2 C

9

8

R 2 7 1 M

C 3 9
1 0 0 n F

0 , 7

R 2 9 2 2 K

C 4 3
5 0 n F

1 3 , 2

1 3 , 4

Q 1 3

D 2 1

+ 1 3 ,4 V D C

A C T V E A U D I O F I L T E R S E L E C T I V I T YB A L A N C E D P R O D U C T D E T E C T O R

R 9 1 , 2 K

C 2 6
1 0 0 n F

R 7 1 K

R 8 1 K

C 2 5
1 0 p F

0 , 1 - 0 ,2

C 2 7
1 0 0 n F

R 1 3 4 7 E

R 1 2 1 K

R 1 3 1 K

R F

R X

7 , 5 6 1 , 2 3

7 , 5 6

4 , 2 5

4 , 2 5

3 , 5 6 3 ,5 6

7

8

I C 1

4

M C 1 4 9 6 G

1

2 3 1 0

R 1 4 1 0 0 E

R 1 5 1 0 K

5

9

C 2 9
5 0 n F

6

R 1 3 1 K

C 3 3

1 0 0 n F

1 0 u F

R 1 9 4 7 K

+

R 1 6 2 , 7 KR 1 7 2 , 7 K

C 3 2

+C 3 1

1 0 0 u F

9 , 7 2

9 , 7 2

H

C 2 4
1 , 8 n F

C 2 6

R 2 2 4 7 0 K

+ 1 2 V

C 2 5
1 , 8 n F

3

1 4

0 , 5 3

R 2 1 8 2 K

4

R 2 3 4 7 0 K

I C 2 A

0 , 5 6

2

7

1 n F

R 2 5 1 M

C 2 5
1 , 8 n F

6

0 , 5 3

I C 2 B

1

R 2 4 8 2 K

J J

W I D E

5

H H

H H

0 , 5 6

N A R R O W

K E Y I N G

Q 1 1

1 3 , 3 7

R 6 5 1 K

+

C 9 1
2 u F

R 6 7 4 , 7 K

1 3 , 4

1 3 , 3

0

0 , 7 9

0 , 7 7

R 6 7 4 , 7 K

K E Y
J A C K

K E Y

1 2 , 4 2

1 3 , 1 4

R 7 1 1 0 K

W

Y

X X

D

E

Z

V

C 4 2
2 u F

P P

+

C C 4

W W

J

1 3 , 2

0

K

M

A N T E N N A
J 3 0 2

C 1 0 4
5 0 n F

R 3 0 2 1 K

D 3 0 1

R 3 0 3 1 K

1 0

1 1

1

R 3 0 5 4 7 K

+

1 2

_

1 0

1 0

1 1

1 1

1

1

1 2

1 2

1 0

1 0

1 1

1 1

1

1

1 2

1 2

1 0

1 0

1 1

1 1

1

1

1 2

1 2

O U T P U T
M E T E R

R F C 3
2 6 u H

S

X

D X

1 6

1 7

1

C 9 4
1 0 0 p F

C 9 8
1 0 0 p F

S W 1 F

1 8

C 9 5
8 - 6 0

1 6

1 6

1 7

1 7

1

1

S W 2 F

1 8

1 8

C 9 9
8 - 6 0

1 6

1 6

1 7

1 7

1

1

S W 3 F

1 8

1 8

C 1 0 3
8 - 6 0

1 6

1 6

1 7

1 7

1

1

S W 4 F

1 8

C 1 0 6
8 - 6 0

Z D 2
3 6 V

L

S

R Y 1

3 . 5 M h z

L 2 6
1 5 , 5 u H

C 9 6
1 5 0 p F

7 . 0 M h z

L 2 6
7 u H

C 1 0 1
1 0 0 p F

1 4 M h z

L 3 1
2 , 5 u H

C 1 0 4
7 5 p F

2 1 M h z

L 3 3
1 , 3 u H

C 1 0 7
1 0 0 p F

L O A D I N G C

L 2 7
2 7 , 5 u H

C 9 7
6 8 0 p F

L 2 9
7 u H

C 1 0 2
4 0 0 p F

L 3 2
2 , 5 u H

C 1 0 5
2 0 0 p F

L 3 4
1 , 3 u H

C 1 0 8
1 5 0 p F

S W 1 D

S W 2 D

S W 3 D

S W 4 D

C 3 0 3
5 , 6 / 1 5 0 p F

S C H E M A T I C O F T H E

H E A T H K I T

M O D E L H W - 8

T R A N C E I V E R

B L K

5

C 6 5
5 0 n F

R E D

R E D

2 6

C 6 7
5 0 n F

G R N

G R N

3 7

C 6 9
5 0 n F

W H T

W H T

4

8

C 7 2
5 0 n F

1

S W 1 B

1T

5

14

N

1

3 . 5 M h z

S W 2 B S W 3 B S W 4 B

6

6

5

14

14

1P 1Q 1R

7 . 0 M h z 1 4 M h z 2 1 M h z

R 5 4 4 7 E

C 7 9
5 0 n F

R 5 7 4 7 E

C 8 3
5 0 n F

6

5

R 5 9 4 7 E

C 8 6
5 0 n F

6

5

14

R 6 2 4 7 E

C 8 9
5 0 n F

C 9 3
4 7 0 n F

+ 1 3 , 4 V

L 1 4 L 1 5 L 1 6L 1 3

C 6 4
2 3 0 p F

Q 4

C 6 6
1 0 0 p F

D 1 6

1 2 , 7

D

0 , 9 2

S

R 4 6 1 0 0 E

C 6 8
1 0 0 p F

D 1 7

C 7 1
4 7 p F

D 1 8

D 1 9

C 7 3
3 , 3 p F

CS

C 6 3
5 0 n F

C 7 2
5 0 n F

R 5 2 2 2 KR 5 3 4 , 7 K

L 2 2

1 3 , 4

Q 5

4

C 7 5

1 , 1 2

R 4 8 4 7 K R 4 7 4 7 K

5 0 n F

T P 2

R 4 9 2 7 0 ER 5 1 1 0 0 E

9 u H

1 0 , 8

Q 8

1 , 0 - 1 ,5

R 5 6 4 7 0 E

C 7 7
6 8 0 p F

C 7 8
3 3 0 p F

L 2 2
4 , 2 u H

D 3 1

D 3 5 D 3 6 D 3 7 D 3 8

1 , 4 4

C 7 6
5 0 n F

R F

R 5 5 1 0 0 E

R 5 8 1 K

C 8 1
4 7 0 p F

C 8 2
2 3 0 p F

L 2 4
1 , 8 u H

D 3 2

R 6 1 6 2 K

C 8 4
1 3 0 p F

C 8 5
1 3 0 p F

L 2 5
1 , 3 u H

D 3 3

R 6 3 2 2 K

C 8 7
4 7 p F

C 8 8
4 7 p F

D 3 4

F . B .

R F

R F C 2
3 5 0 u H

Q 9

1 , 0 - 1 ,5

F I N A L A M P L I F I E R

D E F

3 , 5 M h z

S W 1

1 0 1 1 1 2

2 3

1

1 3 1 4 1 5

5 6

4

1 6 1 7 1 8

8 9

7

A B C

L 2 1

+ 1 3 , 4 V

7 M h z

N O T E :

S E G M E N T " E " O F S W 1 , S W 2 , S W 3

D 2 9

C 1 2 7
3 , 3 p F

2 , 0 4

7 , 8 2

2

R 9 5 2 2 K R 9 4 6 8 K

R 9 6 1 0 0 E

Q 7

1 2 , 2 6

1 , 2 2

A N D S W 4 R E M A I N
W I T H O U T C O N N E C T I O N S .

C 1 2 8
5 0 n F

1 4 M h z

2 1 M h z

R 9 3 4 7 0 E

M E C H A N I C A L
I N T E R L O C K

S W 2

S W 3

S W 4

D E F

1 0 1 1 1 2

2 3

1

1 3 1 4 1 5

5 6

4

A B C

D E F

1 0 1 1 1 2

2 3

1

1 3 1 4 1 5

5 6

4

A B C

D E F

1 0 1 1 1 2

1 2

3

1 3 1 4 1 5

4 5

6

A B C

B A N D S W I T C H

1 6 1 7 1 8

8 9

7

1 6 1 7 1 8

8 9

7

1 6 1 7 1 8

7 8

9

O R I G I N A L D R A W I N G B Y H E A T H K I T 1 9 7 6

R E D R A W N B Y P A 0 G W V 2 0 0 9