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EDUTEK LTD
Circuit diagram:
BEFORE STARTING...
Ensure the soldering iron tip you are using is
cleaned and well tinned. Use a flux-cored
solder when soldering. Clean it frequently
with a wet sponge and use a soldering iron
stand if possible.
Use a soldering iron with a thin tip and use
thin gauge solder to avoid bridging any
tracks with solder.
CHECKING COMPONENTS
Check through the parts list and note the
ones that have polarity, as they must be
inserted the correct way round.
ASSEMBLY
There are also assembly instructions available on line as a PowerPoint presentation and in
pdf format.
To begin with, have
the PCB placed in
front of you as
shown.
Follow the next steps
in order.
HANDY TIMER
ASSEMBLY INSTRUCTIONS (v3.14)
1KΩ
(brown, black, red)
R1
R2
100Ω
(brown, black, brown) 1
C1
1uF ceramic dipped
Semi-conductors
D7
LED 5mm, Red
IC1
PIC12F629
Miscellaneous
SW1-4 Switch, round blue
TD1
BH1
Battery Holder, coin cell 20mm
Solid core wire
8 pin DIL IC holder
visit edutek.ltd.uk
("105") 1
1
4
1
1
1
1
1
1
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Table of Contents
Summary of Contents for EDUTEK HANDY TIMER
- Page 1 EDUTEK LTD visit edutek.ltd.uk HANDY TIMER ASSEMBLY INSTRUCTIONS (v3.14) Circuit diagram: BEFORE STARTING… Resistors Ensure the soldering iron tip you are using is 1KΩ (brown, black, red) cleaned and well tinned. Use a flux-cored 100Ω (brown, black, brown) 1 solder when soldering. Clean it frequently...
- Page 2 WIRE LINKS Shape 2 pieces of solid core wire to fit LK1 and LK2. When they are soldered, push them flat against the PCB It doesn't matter if they are a little bend or crooked, as long as they are flat.
- Page 3 CAPACITOR This is a non-polarised type so can be inserted either way round. (may also be blue in colour) TRANSDUCER This is the device that produces sound. It can be inserted either way round. PUSH SWITCH The push switch has a flat section on the side.
- Page 4 If the unit fails to work, try the following. • Check LED's are in the correct way round. • Check IC and battery are in the correct way round. • Look for short circuits between pads and remove any excess solder For further details please go to www.edutek.ltd.uk/projects...
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