Produced by:
Roll Your Own
ljunggrenaudio.com
Schematic & PCB Design by:
KYMATICA DEVICES
www.kymatica.com
2xVCX
version 1.0
Bills Of Material Bold = PCB1
Calibration instructions can be found on the last page.
12
100nF
C13 C14
2
10uF
CON1
1
IDC 10-pin
IDC 10 pin power connector (2x5 pin)
D1 D2 D3 D4 D5 D6
6
1N4148
Signal diode
D7 D8
2
1N5818
Schottky diode (or 1N5817, 1N5819)
J1 J2 J3 J4 J5 J6 J7 J8 J9
9
3.5mm jack
Thonkiconn 3.5mm jack socket
PCB_CON1_1 PCB_CON2_1
2
8 pin header male
PCB connector PCB1 (1x8 pin)
PCB_CON1_2 PCB_CON2_2
2
8 pin header female PCB connector PCB2 (1x8 pin)
Pcv1 Pcv2
2
100k
Linear Pot Alpha/Song Huei 9mm
Pofs1 Pofs2
2
22k
Linear Pot Alpha/Song Huei 9mm 20-25k
Q1 Q2
2
BC557B
PNP transistor
19
100k
Resistor 1/4W 1% ca 7mm long
R21 R22 R29 R31 R47 R48
6
10k
Resistor 1/4W 1% ca 7mm long
R23 R24 R27 R28
4
22k
Resistor 1/4W 1% ca 7mm long
R25 R26 R30 R32
4
470R
Resistor 1/4W 1% ca 7mm long
R42 R43 R44
3
1k
Resistor 1/4W 1% ca 7mm long
R45 R46
2
10R
Resistor 1/4W 1 to 5% ca 7mm long
R9 R11 R13 R14 R15 R18 R33 R34 R35 R36
10
200k
Resistor 1/4W 1% ca 7mm long
SW1 SW2
2
on-off-on
TRbal1 TRbal2
2
50R
Trimpot Bourns 3296W or equivalent
TRgain1 TRgain2
2
50k
Trimpot Bourns 3296W or equivalent
3
TL074
DIP-14 quad op-amp (or TL084)
U4
1
LM13700
DIP-16 dual OTA
1
TL072
DIP-8 dual op-amp (or TL082)
3
DIP14
IC Socket
U4
1
DIP16
IC Socket
1
DIP8
IC Socket
2
PCB spacer 11mm
4
Knobs
1
16 to 10 pin IDC ribbon cable
1
Panel
C1 C2
C3 C4 C5 C6
C7 C8
C9 C10 C11 C12
Capacitor bypass MLCC X7R 2.5-
2.54mm pin pitch
Capacitor electrolyte 2mm pin pitch,
5mm dia, max 10mm height. Min 25V.
R1 R2 R3 R4 R5 R6 R7 R8
R10 R12 R16 R17
R19 R20
R37 R38 R39 R40 R41
SPDT on-off-on mini toggle switch.
Mouser# 108-1MS3T2B3M2QE-EVX
U1
U2 U3
U5
U1
U2 U3
U5
