Kitronik 2113, Heat Activated Switch Build Instructions
HEAT ACTIVATED SWITCH KIT
REACT TO THE
TEMPERATURE WITH THIS
ESSENTIAL INFORMATION
BUILD INSTRUCTIONS
CHECKING YOUR PCB & FAULT-FINDING
MECHANICAL DETAILS
HOW THE KIT WORKS
Version 2.1
Heat Activated Switch Essentials
www.kitronik.co.uk/2113
Build Instructions – Cold activated
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 resistor:
The text on the PCB shows where R1, go.
Ensure that you put the resistors in the right place.
PCB Ref
Value
Colour Bands
R4
220Ω Red, red, brown
Now place the two transistors. They should be placed into Q1 and Q2. It is important that they are
inserted in the correct orientation. Ensure the shape of the device matches the outline printed on the
PCB. Once you are happy solder the devices into place.
Place the variable resistor into R1. It will only fit in the holes in the board when it is the correct way
around.
Solder the thermistor in to the circle indicated by the text R2. This is next to the ‘cold’ text. It does
not matter which way around it is inserted.
Connecting power
There are two power terminals on the PCB to allow power to be connected. These are identified by the text ‘power’
on the PCB.
• The positive power connection should be connected to the terminal indicated by the text ‘+’ and ‘red’
• The negative power connection should be connected to the terminal indicated by the text ‘-’ and ‘black’
Connecting an LED
The circuit can be used to turn on a LED. The LED should be soldered into the LED1 on the PCB. A current limit
resistor must also be placed in the R3 on the PCB. The value of R3 will depend on the LED used and the supply
voltage. For a standard LED and a 5V supply voltage a 220Ω would be
suitable. Connecting an external circuit to the boards output
The circuit can be used to control another device. To do this the device
that is to be controlled should be connected to the terminals labelled
output. When the circuit is activated the output turns on and can be
used to turn on the device to which it is connected.
Note: This output will be around 0.9V lower that that connected to the PCB.
PLACE
THE
RESISTORS
1
Place the Transistors
2
Place the variable resistor
3
Plac
e the
thermistor
4
External
Circuit
Output +
Output –
Heat Activated Switch Essentials
www.kitronik.co.uk/2113
Build Instructions – Heat activated
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 resistor:
The text on the PCB shows where R1, go.
Ensure that you put the resistors in the right place.
PCB Ref
Value
Colour Bands
R4
220Ω Red, red, brown
Now place the two transistors. They should be placed into Q1 and Q2. It is important that they are
inserted in the correct orientation. Ensure the shape of the device matches the outline printed on the
PCB. Once you are happy solder the devices into place.
Solder the thermistor in to the circle indicated by the text R1. This is next to the ‘hot’ text. It does
not matter which way around it is inserted.
Place the variable resistor into R2. It will only fit in the holes in the board when it is the correct way
around.
Connecting power
There are two power terminals on the PCB to allow power to be connected. These are identified by the text ‘power’
on the PCB.
• The positive power connection should be connected to the terminal indicated by the text ‘+’ and ‘red’
• The negative power connection should be connected to the terminal indicated by the text ‘-’ and ‘black’
Connecting an LED
The circuit can be used to turn on a LED. The LED should be soldered into the LED1 on the PCB. A current
limit resistor must also be placed in the R3 on the PCB. The value of R3 will depend on the LED used and the
supply voltage. For a standard LED and a 5V supply voltage a 220Ω would be suitable.
Connecting an
external circuit to the boards output
The circuit can be used to control another device. To do this the
device that is to be controlled should be connected to the terminals
labelled output. When the circuit is activated the output turns on
and can be used to turn on the device to which it is connected.
Note: This output will be around 0.9V lower that that connected to the PCB.
PLACE
THE
RESISTORS
1
Place the Transistors
2
Place the
thermistor
3
Place
the variable resistor
4
External
Circuit
Output +
Output –
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