Component List

Resistors:

Unless otherwise specified:

MELF 0204 or thin film SMD 1206, 1%

R1, R4, R13, R16, R24 = 100 Ω

R2 = 100 kΩ

R3, R5, R6, R9 = 2k8

R7, R20 = not fitted

R8, R21 = 1k8

R10 = 1k5

R11 = 0 Ω

R12 = 4k22, SMD 0603

R14 = 2.15 kΩ

R15, R17 = 8k2

R18, R19, R25, R26 = 4k7, SMD 0603

R22, R23, R27, R28 = 10 kΩ, SMD 0603

R29, R30 = 1 kΩ, SMD 0603

R31, R32 = 47 Ω, SMD 1206

R33 = 3k3, SMD 0603

R36 = 1k1

R37 = 10 kΩ

R38 = 220 Ω

R15, R17 = 8k2

P1 = 10 kΩ lin., stereo pot, 4 mm

P2 = 1 kΩ lin., stereo pot, 4 mm

Capacitors:

C1, C7 = 82 nF, C0G, SMD 0805

C2, C8 = 100 nF, C0G, SMD 1206

C3, C9 = 5n6, C0G, SMD 0603

C4, C10 = 22 nF, C0G, SMD 0805

C5, C11 = 1n5, C0G, SMD 0603

C6, C12 = 3n9, C0G, SMD 0603

C13, C14 = 2,200 µF / 16 V, electrolytic, pitch 2/10″

C15…C18, C22…C28 = 100 nF, X7R, SMD 0603

C19, C20, C29…C36 = 22 µF / 20 V, tantalum, SMC-B

C21 = 220 µF / 16 V, electrolytic, pitch 2/10″

Semiconductors:

D1…D5 = 1N4148, DO214AC

D6…D8 = SK34, DO214AC

B1 = B40C1000, bridge rectifier, round

LED1, LED2 = LED, SMD 0805

T1…T4 = 2N3904, SOT23

IC1…IC3 = OPA2210, SOIC8

IC4 = 7812, TO220

IC5 = 7912, TO220

IC6 = 7805, TO220

Miscellaneous:

X1, X4 = BNC socket, AMP 227161

X2 = 2-pin screw terminal, pitch 5 mm, AK300/2

X3 = 3-pin screw terminal, pitch 5 mm, AK300/3

K1…K3, K5, K6, K8 = 2-pin header, pitch 1/10″

K4 = 4-pin header, pitch 1/10″

K7 = 3-pin header, pitch 1/10″

K1 = SMD relay, 2 × changeover, TQ2-SA-5V (Form C)

K2…K5 = SMD relay, 5 V, 9802-05-00

F1 = fuse, 250 mA, holder 22.5 mm

TR1 = transformer, 3.6 VA, 2 × 12 V sec., Gerth 387.24.2

Attenuator = assembled circuit board (see text)

Step switch 1 × 5 (or 2 × 5)

LED, 5 mm with socket

Switch on K4, 1 × changeover with center position (see text)

Switch on K2

3 BNC sockets, insulated, front panel mounting

2 x rotary knob for pot, 4-mm axis

1 x rotary knob for step switch, 6-mm axis