Part

Value

Type

Quantity

Notes

Resistors

R22

1R

0.25W Metal Film

1

R20

10R

0.25W Metal Film

1

R23

56R

0.25W Metal Film

1

R8

100R

0.25W Metal Film

1

R21

120R

0.25W Metal Film

1

R11, R12, R13, R14, R15, R16

560R

0.25W Metal Film

6

R2, R7

1k

0.25W Metal Film

2

R9, R10

3k3

0.25W Metal Film

2

R4

6k8

0.25W Metal Film

1

R17, R18, R19, R20

10k

0.25W Metal Film

4

R3

33k

0.25W Metal Film

1

R1, R5, R6

47k

0.25W Metal Film

3

Capacitors

C17

220p

Polystyrene

1

C2, C3, C9, C11, C12, C16

100n

Ceramic

6

C10

220n

Polyester Film

1

C13, C14, C15

470n

Ceramic

3

C4

10u/16V

Tantalum

1

C6, C8

47u/10V

Tantalum

2

C1, C5, C7

100u/10V

Tantalum

3

Semiconductors

D1, D2, D3, D4, D5, D6

1N4148

6

D7, D8

1N4001

2

Q1, Q2, Q3

2N3904

3

Q4, Q5

2N3906

2

IC1

78LO5

1

IC2

TBA820M

1

IC3

MAX3232CPE

1

IC4, IC5, IC6, IC7, IC8

SFH618-2

5

Miscellaneous

RL1

BT53W/1

DPDT/4.5V coil

1

Maplin order code: DC34M

T1, T2

OEP1200

1:1 600R

2

Farnell order code: 177-497

JP1, JP2

2-pin jumper

2

SL2, SL3, SL8, SL9

2-pin

straight polarised header

4

Maplin order code: RK65V

SL4, SL7, SL10, SL11

3-pin

straight polarised header

4

Maplin order code: BX96E

SL5

5-pin

straight polarised header

1

Maplin order code: FY93B

SL1, SL6

8-pin

straight polarised header

2

Maplin order code: YW13P