IR RECEIVER BLOK
PCB ASSEMBLY INSTRUCTIONS
Copyright EduTek Ltd – Rev. 2
Circuit Details
The circuit is shown below with a parts list of components.
Check through this list and identify each component.
Label
R1
R2
R3
R4,5
R6,7
IMPORTANT: IR1 receiver module is static sensitive and
precautions should be taken to avoid static discharge. Avoid
holding the wire connections, handle by the case only.
Copyright EduTek Ltd
Component Name
4.7KΩ resistor
470Ω resistor
47Ω resistor
10KΩ resistor
1KΩ resistor
No.
1
1
1
2
2
C1
47uF electrolytic capacitor
1
C2
D1
D2,3
Q1,2
IC1
IR1
4.7uF electrolytic capacitor
BZX44C, 5v1 zener diode
3mm LED green
BC337 transistor
12F629 PIC IC
IR receiver module
1
1
2
2
1
1
Miscellaneous
8 pin DIL IC holder
3 way header plug
Jumper
2 way PCB terminal block
No.
1
1
1
2
ASSEMBLY
Below is the PCB with no components.
The markings show the number and outline of each component.
Before starting, check through the following:
• Ensure you have safety goggles and adequate ventilation.
• Use a soldering iron stand with a damp sponge to clean the iron tip regularly.
• Use some small Wire-cutters to remove excess wire and have some snipe-nose pliers.
Resistors
There are 7 resistors. They must be inserted in the correct place but
can be either way round. Bend the legs near to the resistor body at 90
degrees to ease fitting into the PCB.
R1 = 4.7KΩ, (Yellow, violet, red, gold)
R2 = 470Ω, (Yellow, violet, brown, gold)
R3 = 47Ω,
(Yellow, violet, black, gold)
R4,5 = 10KΩ,
R6,7 = 1KΩ,
(Brown, black, orange, gold)
(Brown, black, red, gold)
Zener Diode
The zener diode is a small glass component. It has a black band at one end,
this is the cathode (negative) connection. This connection should be in the
left hole.
D1 = BZX55C, 5v1
Shape the wires like the resistors, before inserting the zener diode into the PCB.
IC Holder Socket
The IC holder allows easy insertion of the IC. It should be soldered with
the notch on the top facing upwards. This will match up with the IC later on.
To stop the IC holder falling out when you are soldering it, bend over two legs in
opposite corners. They are quite short so there is not much wire to bend. Take care
not to stab your finger.
LED’s
There are two green LED’s, 3mm in size, D2 and D3.
They have polarity so must be inserted the correct way round
with the longer wire in the hole with the “+” sign next to it.
There are 2 ways to identify the polarity of an LED:
• The positive connection is the longest wire
• The negative connection has a flat chamfer on the rim above it.
Transistor
There are two NPN transistors, Q1 and Q2, both BC337.
The legs should already be bent to shape. They must be inserted with the
flat face upwards as shown.
If the legs of the transistor are close together, bend the legs outwards
slightly before inserting into the PCB.
Terminal Connector Blocks
There is one 4-way terminal block. It is made from two 2-way connectors
and fits on the right with the openings facing outwards.
Slide one 2-way connector down the side
of the other so the grooves fit together.
Header Plug
The header plug enables different settings for the circuit.
Once soldered, you can fit the jumper horizontally on either the left
two pins or the right two pins. (The jumper can be omitted completely).
Capacitors
There are 2 polarised capacitors, C1 and C2.
They have polarity and must be inserted with the longer wire inserted into the
hole marked “+”.
C1 = 47uF
C2 = 4.7uF
There are 2 ways to identify the polarity of an electrolytic capacitor:
• The positive connection is the longest wire.
• The negative connection has a silver stripe above it on the casing of the capacitor.
Infra-Red Receiver Module
The IR receiver module, (IR1), has 3 connections and a bubble shaped face.
This bubble must be inserted facing left as shown below. Push it about 2/3
of the way into the PCB.
IMPORTANT: This device is static sensitive and could be destroyed if a
static discharge occurs across the wires. Avoid touching the wires by hand,
use snipe-nosed pliers if possible and ensure the soldering iron is earthed.
Integrated Circuit – IC
Finally insert the IC with the notch facing upwards, to match the IC holder.
Take care that all the pins of the IC are properly located into the holder.