Assembly Instruction

RELAY & DRIVER BLOCK
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
D1
Q1
RL1
Copyright EduTek Ltd
Component Name
4.7KΩ resistor
1N4003 diode
BC337 transistor
DPDT 6v Relay
No.
1
1
1
1
Miscellaneous
3 way PCB terminal block
3 way PCB terminal block
No.
2
1
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.
Resistor
There is one resistor, R1. It does not matter which way round it goes.
Bend the legs the resistor near to the body at 90 degrees.
R1 = 4.7KΩ,
(Yellow, violet, red, gold)
Diode
The diode must be inserted the correct way round, otherwise the circuit will be
permanently damaged. One end has a silver stripe, this is the cathode (negative
connection) and should be at the top.
Shape the legs in the same way as the resistors.
Transistor
There is one NPN transistor, Q1 = BC337.
The legs should already be bent to shape. It must be inserted with the flat
face to the left 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 are 2 sets of terminal blocks.
The 3-way fits on the left hand side with the openings facing outwards.
The 4-way is made from two 2-way connectors and fits on the right facing outwards.
Slide one 2-way connector down the side
of the other so the grooves fit together.
Relay
Finally insert the relay into the PCB, it only fits one way round. The holes
are larger but are a snug fit. Push the relay fully into the PCB and apply
enough solder to fill the pads underneath.