Elenco Fiber Optics Voice and Data Kit - Manual (Page 6)

Figure D
Electrolytics have a polarity
marking indicating the (–) lead.
The PC board is marked to show
the lead position.
Warning: If the capacitor is
connected with incorrect polarity,
it may heat up and either leak or
cause the capacitor to explode.
Figure E
You have received one of four different types of
microphones. If you have type A or B, mount it
with the leads in the correct holes on the PC
board. If you have type C or D, then bend the
leads as shown.
ASSEMBLY INSTRUCTIONS FOR TRANSMITTER
-5-
Figure A
Mount the lug as shown.
Figure B
Bend the leads as shown.
Mount the LED transmitter with
the flat side in the direction
shown below.
Figure C
Mount the LED with the flat
side in the same direction as
marked on the top legend.
Figure F
Mount the transistor in the
correct direction as marked on
the top legend.
Figure G
Insert the IC socket
into the PC board
with the notch in the
direction shown on
the top legend.
Solder the IC socket
into place. Insert
the IC into the
socket with the
notch in the same
direction as the
notch on the socket.
A
B
C
D
Mount flush
with PC board
Flat
Lug
PC Board
Flat
Flat
(–) (+)
Polarity
Mark
IC
IC
Socket
PC Board
Notch
Notch
Marking
Lug (see Figure A)
D2 - LED Transmitter Clear
(see Figure B)
S2 - Switch
R7 - 1k
Ω 5% 1/4W Resistor
(brown-black-red-gold)
8-Pin IC Socket
U1 - 741CN
(see Figure G)
D1 - LED Red (see Figure C)
S1 - Switch
R2 - 10k
Ω 5% 1/4W Resistor
(brown-black-orange-gold)
C1 - 1 μF Electrolytic Capacitor
(see Figure D)
Q1 - 2N3904 NPN Transistor
(see Figure F)
C4 - .022
μF (223) Capacitor
R5 - 10k
Ω 5% 1/4W Resistor
(brown-black-orange-gold)
C3 - 100pF (101) Capacitor
R6 - 100k
Ω 5% 1/4W Resistor
(brown-black-yellow-gold)
R8 - 220 Ω 5% 1/4W Resistor
(red-red-brown-gold)
R4 - 10k
Ω 5% 1/4W Resistor
(brown-black-orange-gold)
C2 - .01
μF (103) Capacitor
MIC - Microphone
(see Figure E)
R1 - 2.2k
Ω 5% 1/4W Resistor
R3 - 2.2k Ω 5% 1/4W Resistor
(red-red-red-gold)