AML ezMEQ-500 User manual

ezMEQ-500 Passive Midrange Equalizer - Assembly manual
[“Colourbook” Issue 2]

ezMEQ5-500 “Colourbook” Contents.
Section 1 - “Colourbook” assembly guide
Section 2 - Schematics diagrams and PCB Overlays
Section 3 - Parts List

Revisions 1 to 1a; Updated for Rev 3 PCB
ezMEQ5-500 “Colourbook” revision history
Revisions 1a to 2; Updated for Rev 4 PCB

Carefully snap apart the 7 PCB’s into individual boards
and trim or file off any excess tabs.
PCB Preparation
Main PCB
Inductor PCB
LF Switch PCB
HF Switch PCB
Dip Switch PCB
Spacer PCB’s

Diodes
D1, D2 & D3 = 1N4007 (3)

R28 = 10R (1)
R27 = 12R (1)
R10 & R24 = 75R (2)
R43 = 270R (1)
Resistors

R15 & R18 = 470R (2)
R38 = 510R (1)
R6 & R14 = 620R (2)
R39 = 1k0 (1)
Resistors

R11 = 1k2 (1)
R13 = 1k5 (1)
R9 = 2k2 (1)
R36 & R41 = 3k0 (2)
Resistors

R19 = 3k3 (1)
R33 = 5k6 (1)
R35 = 7k5 (1)
R7, R16 & R30 = 10k (3)
Resistors

R8 & R25 = 18k (2)
R32 = 22k (1)
R3, R4 & R5 = 33k (3)
R17 & R20 = 56k (2)
Resistors

R29 = 100k (1)
R12 = 120k (1)
R37 = 180k (1)
R40 = 220k (1)
R31 = 1M0 (1)
Resistors R23 = OMITTED

C17 = 100nF (1)
C9, C48 & C49 = 220pF (3)
C50 = 47pF (1)
C12 = 330pF (1)
Ceramic
Capacitors C3 = OMITTED

EMC Filters F1 & F2 = Ferrite Bead (2)
CL 1 & CL2 = 100pF C/L Network (2)

C43 & C46 = 2n2F (2)
C10 & C42 = 4n7F (2)
C7 = 470pF (1)
C41 = 3n3F (1)
Film
Capacitors

C29, C30, C32 & C45 = 15nF (4)
C27 = 47nF (1)
C13 & C44 = 10nF (2)
C21, C23, C38 & C47 = 33nF (4)
Film
Capacitors

C34 & C35 = 100nF (2)
C19 & C33 = 220nF (2)
C22, C25 & C36 = 150nF (3)
Film
Capacitors
C26 = 82nF (1)

C31 = 470nF (1)
C24 & C37 = 1uF (2) - [C37 Mounted on rear]
C20 = 1u5F (1)
C28 & C40 = 680nF (2) - [C40 Mounted on rear]
Film
Capacitors
C39 = 330nF (1) - [C39 Mounted on rear]

Small Capacitors C1, C5 & C6 = 10uF / 50v (3)
Positive terminals towards left
C14 = 22uF / 63v (1)
Positive terminals towards left
C16 & C18 = 100uF / 25v (2)
Positive terminals towards left

Small Capacitors
and Transistors
C11 = 100uF / 63v (1)
Positive terminals towards left
C15 = 220uF / 10v (1)
Positive terminals towards left
Q1, Q2, Q3 & Q4 = BC550C (4)
Q6 & Q7 = BC560C (2)

Trimmers and Relay
R21 & R42 = 500R Top Adjust Trimmer (2)
RL1 = 24 Volt DPCO relay (1)
R22 = 5k Top Adjust Trimmer (1)