Aion Electronics Quark Maxon OD-880 Handbuch - Seite 2

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Parts
Resistors
R1
10k
R2
470k
R3
10k
R4
10k
R5
470k
R6
100R
R7
100k
R8
4k7
R9
10k
R10
10k
R11
9k1
R12
100k
R13
68k
R14
10k
R15
10k
RX1
3k3
RPD
1M to 2M2
LEDR
4k7
Build Notes
Important: If you're not using the EQ mod, you need to jumper the middle and bottom pads of the EQ switch
1
for the effect to work properly. If you do use this mod, make sure to use a regular on-on switch rather than a
center-off switch. The effect would pass only a very weak signal in the center-off position.
The values for RX1 and CX1 are arbitrary and you can use whatever you'd like for these. I would recommend
something that increases the bass, but 3k3 and 220n are just the values I settled on.
Clipping diodes: Try two 1N914s in series for the second side. This will give more output volume and open it
2
up a little bit, so it has more dynamics and less compression.
Sensitivity pot taper: The original uses a 500k linear taper (B) pot here, but I found that audio taper (A) gave
3
a smoother range of control.
Additional Part Notes
• Capacitors are shown in nanofarads (n or nF) where appropriate. 1000n = 1uF. Many online suppliers do
not use nanofarads, so you'll often have to look for 0.047uF instead of 47n, 0.0056uF instead of 5n6, etc.
• The PCB layout assumes the use of film capacitors with 5mm lead spacing for all values 1nF through
470nF. I prefer
EPCOS box film
• Potentiometers are Alpha 16mm right-angle PCB mount.
• Switches are Taiway (Small Bear) or Mountain Switch (Mouser) brand with solder lugs. I prefer the short-
toggle variety, but that's just a matter of aesthetics.
• I recommend using
the board and prevent shorts. If you don't use these, use some electrical tape or cardboard to act as
insulation. The right-angle pots will make direct contact with the solder pads otherwise.
MAXON OD-880 / QUARK OVERDRIVE
C10
CX1
1
or
Panasonic
these dust covers / insulators
Capacitors
C1
47n
C2
47n
C3
47n
C4
100n
C5
100n
C6
4n7
C7
100n
C8
100n
C9
47uF
electro
10uF
electro
220n
1
ECQ-B/V-series.
from Small Bear to insulate the back of the pots from
Semiconductors
IC1–IC3
LM741P
D1
1N4002
D3, D4
1N914
D2, D5
jumper
D5–8
1N914
LED
5mm LED
Potentiometers
Sensitivity
500kB
3
Level
10kB
Other
Clip
SPDT
center off
EQ
SPDT
1
2
2