Download Assembly Instructions

IR TRANSMITTER 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
C1
Component Name
470Ω resistor
1KΩ resistor
22Ω resistor
47uF electrolytic capacitor
C2
D1
D2
Q1
IC1
SW1,2
1uF ceramic dipped capacitor
BZX44C, 5v1 zener diode
Infra-Red LED 5mm
BC337 transistor
PIC16F29 PIC IC
Tactile switch 6x6 7mm
Miscellaneous
8 pin DIL IC holder
3 way header plug
Jumper
2 way PCB terminal block
Copyright EduTek Ltd
No.
1
1
1
1
1
1
1
1
1
2
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 3 resistors, all are a different value. They must be inserted in
the correct place but can be inserted either way round. Bend the legs
near to the resistor body at 90 degrees to ease fitting into the PCB.
R1 = 470Ω,
R2 = 1KΩ,
R3 = 22Ω,
(Yellow, violet, brown, gold)
(Brown, black, red, gold)
(Red, red, black, 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
top 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.
Capacitor – non-polarised
There is one non-polarised capacitor, C1 = 1uF.
Because it has no polarity, it can be inserted either way round.
(May also be
yellow in colour)
C1 = 1uF, (marked as ‘105’)
Transistor
There is one NPN transistor, Q1 = BC337.
The legs should already be bent to shape. It must be inserted with the flat
face on the left as shown.
If the legs of the transistor are close together, bend the legs outwards
slightly before inserting into the PCB.
Switches
There are 2 PTM click-effect switches.
They should be positioned horizontally as shown below. The pads are
enlarged to allow for extra solder.
Try to ensure they sit level to the PCB.
Terminal Connector Blocks
There is one 4-way terminal block.
It is made from two 2-way connectors and fits on the left 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 – polarised
There is one polarised capacitor, C1, a 10uF electrolytic type.
It has polarity and must be inserted with the longer wire inserted into the hole
marked “+”.
C1 = 47uF elec.
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.
IR LED
There is one 5mm infra-red LED. It must be inserted with the longer wire in the
hole with the “+” sign next to it. Insert it about 8-10mm above the PCB so it can
be bent at 90 degrees, in line with the PCB.
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.
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.