Opitec 105.445 User manual

1
E105445#1
105.445
Alarm
Please Note
The OPITEC range of projects is not intended
as play toys for young children.They are tea-
ching aids for young people learning the skills
of Craft, Design and Technolo- gy.These pro-
jects should only be undertaken and tested
with the guidance of a fully qualified adult. The
finished projects are not suitable to give to
children under 3 years old. Some parts can be
swallowed. Dan- ger of suffocation!

2E105445#1
1. Product information:
Article: Battery operated circuit
Use: in Design Technology Key Stage 3
2. Material information
2.1. Material: Pine (coniferous) softwood
Wood should be realtively dry before working
Gabun plywood, multi layered
Working: All wood can be sawn, filed, drilled and sanded
Measure to size or use a pattern
Joining: Use PVA white woodworking glue;
Finish: Use wax (liquid or solid)
Paint (undercoat and top coat)
2.2. Material: Welding rod (steel)
Working: Bending
Joining: Tie with a threadr
Finish: None necessary
2.3. Components:
Battery holder: to hold one mignon cell (AA)
Pulse tone buzzer: Changes electrical energy into sound
Wire: Insulated single core (0.5mm)
Brass band: Contact stripr
3. Tools
Sawing: Use a fret saw for all curves and round shapes.
Note! The blades fit the saw with the teeth facing forward
Use a proper fret sawing board and saw with slow even strokes.
Use a fine bladed saw for straight cuts
Note! Clamp the work in a vice
Filing: Choose a suitable grade file for the work
Note! Files only cut on the forward stroke!
Sanding: Use a block and glasspaper for all flat surfaces
Loose paper can be used for curves and individul forms

3
E105445#1
3. Tools
Drilling: Use a handrill or a pillar drill
Note! Take care when drilling and adhere to the safety rules,
tie all long hair back, remove rings and jewellery. Hold
work to be drilled in a vice
Cutting: Use side cutters for cutting the insulated wire and brass strip
Soldering: For soldering use a 15-30 Watt iron with a fine tip and a flux paste
Note: A hot soldering iron can cause burns.
Electronic solder already contains flux.
4. Parts list:
Part Material Quantity Diagram / Part No Size
Base (1a)
Cover (1b) Plywood 2 5 x 110 x 110 mm
Frame (2a-c)
feet (2d) Pine 2 5 x 30 x 250 mm
Alarm Buzzer 1
components
Battery holder 1 1x Mignon
Clothes peg 1
Brass strip 1 0.3 x 5.5 x 150 mm
Trip wire Nylon thread 1 Ø 0.3 x 2000 mm
Beech dowel 1 Ø 3 x 50 mm
Welding rod 1 Ø 1 x 100 mm
Sundries Screws 2 2 x 10 mm
Bolt 1 M3 x 16 mm
Bolt 2 M3 x 10 mm
Nuts 4 M3
1
2
3
4
5
6
8
9
10
11
12
13
14

5. Exploded diagram:
6. Wiring diagram
4
D105434#1
Scale 1 : 2
+
+
+
Battery
1,5V
Clothes peg
Buzzer
3
13
13
1a
2c
2a 2b
4
9
2d 10
2a
8
12
5
6
14
14
7
11
1b

7. Planning and Making
7.1 Planning and making the case
7.2 Making the trip wire
7.3 Designing the switch (Clothes peg and Brass strip)
7.4 Mounting the components
7.1 Planning and making the case
7.1.1 Drill the base (1a) and the cover (1b) as shown in the diagram (see page 9)
Note: The dotted line on the base shows the position of the circuit
7.1.2 Mark out and cut the sides so that two (2b+c) are 110mm long and two (2a) are 100mm long. The four feet
(2d) are 20mm long (see diagram)
5
E105445#1
Ø 2
Ø 2
Ø 5
2,5
55
107,5
110
10
10
55
110
28
28
7
15
23
30
10
15
20
110
20
30
20
30
100110
30
Ø 5
Ø 3
Ø 3
Ø 3
20
110
55
23
23
110
Cover (1b) Base (1a)
Side (2c)
Side (2b) 2x Side (2a)
4x feet (2d)

7.1.3 Finally mark out and drill the side (2c) as shown in the diagram (see page 5)
Note. The number of holes in the side make it difficult for the alarm to be ‘cracked’ and at the
same time you can hear the ‘noise’ better.
7.1.4 Glue the feet in the corners of the frame
Note: Make sure the case is made properly so that that the dowel can be inserted into a hole and
into the clothes peg.
7.1.5 Fix the cover with two small screws so that it fits properly, then remove it once again to complete the project
7.2 Making the trip wire
7.2.1 Make a groove in the top of the dowel (9) as shown in the diagram and file a point
Note: The groove can be made with a triangular file. An alternative design is to drill a 2mm
diameter hole for the thread instead of the groove.
7.2.2 Bend an eye shape into one end of the welding rod (10).
7.2.3 Thread one end of the nylon line through the eye of the welding rod and wind the other end around the
groove in the dowel pin. (or hole if you have chosen that design)
6E105445#1
1
2
35
50
Ø 6
1b
1a
2a
2a
2b
9
10
2c
2d
11
2d

7.3 Designing the switch (clothes peg and brass strip)
7.3.1Cut two pieces, each 35m long from the brass strip and bend them around the ends of the clothes peg. (see
diagram)
7.3.2 Solder a formed brass contact to the minus pole( Black cable) on the pulse tone
alarm. Solder the black cable from the battery holder to the second brass contact
Note: Due the heat generated when soldering it is advisable to solder the contacts first and then
glue them to the clothes peg
7.3.3 Glue the brass strips to the clothes peg with a hot glue gun or a universal glue.
7.4 Mounting the components
7.4.1 Fix the clothes peg to the base of the box with a small bolt (12) and two lock nuts (14)
Hold (13) the buzzer in place with two nuts (14) and bolts (13)
Fix the battery holder (4) in place with glue gun or universal glue
7.4.2 Solder the plus lead (yellow or red) from the buzzer to the battery holder plus connection. Then solder the
wire from the clothes peg to the other side (spring) of the battery holder.
Note: Do not hold a hot soldering iron too long on the battery holder or the conducted heat will
melt the plastic and loosen the connector !.
7
E105445#1
yellow
black
red/yellow
black
black

7.4.3 Testing and Evaluating the circuit
Insert the dowel into the corrct hole in the side of the case and in between the contacts on the clothes peg.
Now set up the trip wire. When the dowel is pulled out of the box the contacts on the clothes peg close,
making the circuit and setting off the alarm. If the circuit does not work, check all the solderjoins
7.4.4 When the circuit has been checked and is working perfectly screw the cover in position..
8E105445#1

Patterns
M 1 : 1
9
E105445#1
Ø 2
Ø 2
Ø 5
2,5
55
107,5
110
10
10
55
110
28
28
Ø 3
Ø 3
Ø 3
20
110
55
23
23
110
Cover (1b)
Base (1a)
2d
2d
2d