Ramsey Electronics FX-440 Manual page 73

Stage
A:
ASSj:MBL Y STEPS
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\JiA 1. Strip 1 /8" of insulation from the heavier-gauge black wire,
- ,. insert and solder in the GROUND hole. This connection may be
>,soldered on the TOP side of the board as well as the solder side.
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•.k'A2.
Strip 1/8" of insulation from the in-line fuse wire and solder it
to one of the S1 switch lugs of the volume control (R7). The switch
lugs are the two outermost lugs of the 5 lugs.
FUSE
VOLUME
IN
OUT
--c~
GND - - " " -
,,.-- / PWR
V--rf\J/A3. Strip 1/8" of insulation from each end of the heaviest gauge
1 conductor wire remaining in your kit. Solder one end to the
other switch lug on R7 and the other end to the PWR point on the
PC board. MAKE SURE that ALL strands of this wire are neatly
inserted and soldered in the hole. Any stray strand will cause a
dji'ect short when it touches the ground plane.
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A4. Install L20, the 500 uH noise filter inductor. It is the large
/ cylinder shaped component with wires coming from each end .
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Install C42, 1500 uf, the first (and largest!) of the electrolYtic
·' capacitors. The ( +) side must be oriented as imprinted on your
boald, toward L20.
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A6. Install C95, a 4. 7 to 1 O uf electrolytic
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A7. Install C94, another 4. 7 to 10 uf electrolytic. Observe correct
· · ,J3'olarity for all electrolytic capacitors.
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A8a. Select D18, the 1 N4002, the largest of the diodes used in
your kit. It has a black body with a gold band on one end. Notice
the band towards one end aesignating the cathode. This diode
MUST be installed with its ANODE in the ground hole nearest the
back of the PC board. Solder the anode end now, letting the diode
body stand vertically on the board.
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Gently bend the cathode wire into its hole, pull it through so
that it is as short as possible with the diode standing vertically.
Solder and trim excess wire. NOTE: this is the basic method for
, installing all upright parts.
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f') A9a Voltage Regulator VR1 (type 7808 for 8 volts) is mounted
with its metallic back flat against the ground plane, secured by the
FX-440 Assm. 13