Aion Electronics Halo Fuzz Manual - Halaman 4
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Halaman Cetak
Variant: Fire Red Fuzz
A boutique BMP clone from BJFE in Sweden. It's somewhat close to a Violet Ram's Head, but take note of the
alternate JFET gain recovery stage.
Capacitors
C1
1uF
C2
(omit)
C3
1uF
C4
100n
C5
470pF
C6
100n
C7
100n
C8
(omit)
C9
1uF
C10
3n9
C11
10n
C12
220n
C13
1uF
C14
100uF
C15
100n
C101
10uF
* For the JFET gain recovery stage, omit R20 and add C101 and R101. JFETs have different pinouts than
bipolar transistors, so an extra pad has been provided to keep you from having to twist the legs around.
Assuming your JFET's pinout is D-S-G (typical for 2N5485), keep the transistor facing the same direction as
the silkscreen but shift it down by one pad. (The two outer pads are connected.)
** For the JFETs in the first clipping stage, tie together the source and drain. However, make sure to check
the datasheet for your brand of JFET. 2N3819s tend to be D-G-S, different from a 2N5485, but sometimes
different brands have different pinouts. For a D-G-S pinout you will need to tie together the two outer pins
which takes some dexterity. Leave plenty of space around the middle pin so nothing shorts against it!
Additional Part Notes
• For all variants listed above, the Sustain and Tone pots are 100kB and Volume is 100kA.
• In some of the configurations, capacitors such as C4 and C7 are 1uF. I left space around these so you
can use
Panasonic ECQ-V film
• Values above are assuming the midrange mod is not used. If you do use this mod, you'll want R18 to
be 2.2k or 3.3k and C10 to be 12n. This may not always sound exactly like the original since many of the
variants get their distinctive sound from the tone section, so it's advisable to socket R18, R19 and C10
and experiment.
• Potentiometers are Alpha 16mm right-angle PCB mount.
• 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.
BIG MUFF PI / HALO FUZZ
capacitors. Some others such as
these dust covers / insulators
Resistors
R2
33k
R3
100k
R4
470k
R5
100R
R6
15k
R7
470R
R8
8k2
R9
100k
R10
470k
R11
100R
R12
10k
R13
8k2
R14
100k
R15
470k
R16
150R
R17
15k
WIMA box film
from Small Bear to insulate the back of the pots from
Resistors, cont.
R18
22k
R19
22k
R20
(omit)
R21
68k
R22
14k7
R23
6k8
R24
100R
R101
2k
Semiconductors
Q1 - Q3
BC550C
Q4
2N5485*
D1 - D2
2N3819**
D3 - D4
1N914
will fit as well.
4