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SubSystem : P5

Task Title:
Keep Cool Fan

Name:
Transistor Driver
(Output Buffer)


OnTrack
equipment you will need:

IP1, P6, P5, OP2, OP1
Bridge Power Base
Component Card
6 x 2mm White Leads
2 x Crocodile Leads
Motor

Connecting Subsystems:


1, Place the IP1, P6, P5, OP2 and OP1 modules onto the Bridge Power Base (see Fig 5.). Connect up the OnTrack module to hold these down.

2, Use four white leads to connect the IP1 module to the Thermistor and the 500K Ohm Variable Resistor.

3, Now use two white leads to connect OP1 to the buzzer as indicated.

4, Connect two crocodile leads to the low voltage output on OP2 and then clip them onto the contacts of the motor/ fan.

5, Check your wiring is accurate and then connect the 9 volt power supply.

 

Testing and Investigating:

1, Rotate the 500K Ohm Variable Resistor until the motor/ buzzer just stops working. Be careful to not turn too far.

2, Now breathe warm air onto the Thermistor - The motor and buzzer should operate. If it doesn't, repeat 1 above more accurately.

3, As the Thermistor cools down, the outputs should turn off.

4, Where might this system be used? Think of different situations where it might be useful to measure temperature and control it.