Embedded Files
Following on from our theory work on transistors and capacitors, you may wish to have a go at building this fairly simple transistor Astable circuit shown in Fig 1 and Fig 2.
Fig 1
Experiment with the values of the capacitors and see what happens – I’ve used 22µf capacitors but you may wish to try others.
What do you think will happen if you alter the values of the capacitors?
What do you think will happen if you alter the values of the capacitors?
In addition to a Prototype board (Breadboard), wire for connections and a power source, you will need the following components to build this circuit:
2 x 10KΩ Fixed Resistor2 x 220Ω Fixed Resistor2 x 22 µF Capacitor2 x BC 548B Transistor2 x LED
2 x 10KΩ Fixed Resistor2 x 220Ω Fixed Resistor2 x 22 µF Capacitor2 x BC 548B Transistor2 x LED
Fig 2
Transistor AstableAs an add on to this activity I have developed a through hole PCB. You can see below the PCB file produced on a program called Proteous and images of the completed PCB. Please see Diamond+ Electronics - Printed Circuit Boards (google.com) for more information on PCB's.
If you wish to solder up your own Astable PCB please have a chat with me as I will probably have some spares for you to have a go with.
If you are a regular to our lab sessions in Sheffield you will probably be able to spot that this is the circuit used in our Workstation lab - you can see how it was developed here from the prototype board to the completed PCB.
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