Kitronik Alarm Kit Essential Information

ALARM KIT

WHAT CAN YOU PROTECT WITH THIS

ESSENTIAL INFORMATION

BUILD INSTRUCTIONS

CHECKING YOUR PCB & FAULT-FINDING

MECHANICAL DETAILS

HOW THE KIT WORKS

Version 2.0

Alarm Essentials

www.kitronik.co.uk/2101

Build Instructions

Before you start, take a look at the Printed Circuit Board (PCB). The components go in the side with the writing on
and the solder goes on the side with the tracks and silver pads.

Start with the seven resistors:
The text on the PCB shows where R1, R2 etc go.
Ensure that you put the resistors in the right place.

PCB Ref

Value

Colour Bands

R1, R3 & R5

10KΩ

Brown, black, orange

R2

220K

Ω Red, red, yellow

R7

330Ω

Orange, orange, brown

R4 & R6

1.2M

Ω Brown, red, green

Solder the four ceramic capacitors into C1, C3, C4 and C6. They can go in either position as they
are all the same.

Solder the two electrolytic capacitors into C2 and C5. They can go in either position but it is
important that the ‘–’on the capacitor lines up with the ‘----’ markings on the PCB.

Solder the Integrated Circuit (IC) holder into U1. When putting this into the board, be sure to get
it the right way around. The notch on the IC holder should line up with the notch on the lines
marked on the PCB.

Solder the Light Emitting Diode (LED) into LED1. The alarm won’t work if it doesn’t go in the right
way around. If you look carefully one side of the LED has a flat edge, which must line up with the
flat edge on the lines on the PCB.

The buzzer should be soldered into the ‘buzzer’ terminal. The red wire must go to the ‘+’ terminal
and the black wire must go to the ‘–’ terminal.

PLACE RESISTORS

1

SOLDER THE CERAMIC CAPACITORS

2

SOLDER THE ELECTROLYTIC

CAPACITORS

3

SOLDER THE IC HOLDER

4

SOLDER THE LED

5

SOLDER THE BUZZER

6

Alarm Essentials

www.kitronik.co.uk/2101

The battery connector should be soldered into the ‘Power’ terminal. The red wire must go to the
‘+’ terminal and the black wire must go to the ‘–’ terminal.

Cut and strip two short lengths of wire. Solder these to an edge and the centre terminal on the
same row of pins on the switch. The terminals that should be used are shown in black on the
drawing, below. Now solder the other end of the wires to the PCB where it is marked ‘armed’. It
does not matter which way around the two wires go.

Look carefully at the sensor switch and you will see that it is marked COM (common), NO
(normally open) and NC (normally closed). Cut and strip two short lengths of wire. Solder these to
the COM and the NO terminals on the switch and solder the other end of the wire to the PCB
connection marked Q1 (sensor).

The IC can be put into the holder ensuring the notch on the chip lines up with the notch on the holder.

FIT THE BATTERY CONNECTOR

7

SOLDER THE ARM / DISARM SWITCH

8

SOLDER DETECTION SWITCH

9

PLACE THE IC INTO HOLDER

10