EDUTEK LTD
visit edutek.ltd.uk
HANDY TIMER
ASSEMBLY INSTRUCTIONS (v3.14)
Circuit diagram:
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.
Resistors
R1
1K
Ω
(brown, black, red)
1
R2
100
Ω
(brown, black, brown) 1
Capacitors
C1
1uF ceramic dipped ("105") 1
Semi-conductors
D7
LED 5mm, Red
4
IC1
PIC12F629
1
Miscellaneous
SW1-4 Switch, round blue
1
TD1
Transducer
1
BH1
Battery holder, coin cell 20mm
1
Solid core wire
1
8 pin DIL IC holder
1
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.
