ASSEMBLE COMPONENTS TO THE PC BOARD
-5-
D1 - LED (light emitting diode)
(see Figure A)
VR1 - 900k
W
Trim Pot
(see Figure B)
U1 - 8-pin IC Socket
U1 - LM555 Integrated Circuit
(see Figure C)
C1 - .02
m
F or 0.22
m
F
(203 or 223) Discap
R1 - 1M
W
5% 1/4W Resistor
(brown-black-green-gold)
SW1 - Switch
(see Figure D)
R3 - 1k
W
5% 1/4W Resistor
(brown-black-red-gold)
C2 - 47
m
F Electrolytic Capacitor
(see Figure E)
R2 - 100k
W
5% 1/4W Resistor
(brown-black-yellow-gold)
SW2 - Switch
(see Figure D)
Wire/Washers (left & right hand)
(see Figure F)
Figure A
Mount the LED with the flat side in
the same direction as marked on
the PC board.
Flat
Mount flush
with PC board
Figure C
Insert the 8-pin IC socket into
the PC board in the direction
shown.
Solder and cut off
excess leads.
Then, insert
the LM555 IC into the socket
in the same direction shown.
Figure B
Mount the 900k
W
pot to the PC
board as shown. Solder and cut
off the excess leads.
Figure D
Cut the tabs off of the switch
as shown.
Figure E
The electrolytic capacitor has polarity. Be sure
to mount it with the negative (–) lead (marked
on side) in the correct hole. Bend the capacitor
as shown.
Polarity
Marking
1/8”
IC LM555
PC Board
IC Socket
Figure F
Cut the wire in half. Strip 1/4” of insulation off of
one end and 1/2” off of the other end.
Loop the 1/2” end around the washer and then
solder it. Solder a wire to the PC board marked
Left Hand and a wire to Right Hand.
Knot the wires as shown to create a strain relief.
Tab
Tab
Looped
Wire
Solder
Knotted
Wires
