This project has been designed to introduce the important concept of astable timers and pulse-width modulation using the 555 timer astable circuit.
Comprehensive teacher notes are available here.
This circuit is very important as it features heavily in KS4 curriculums. It has been designed to have more than one possible outcome and therefore more than one application. It allows for good differentiation and includes a transistor drive circuit.
notes for this and other project kits are available for download at our
Education Resources site.
- Frequency can be varied by the 2 variable resistors
- PCB has space for a transistor drive circuit to allow higher powered outputs to be added
- Clear silkscreen text has been used to make construction simpler
- Professional double-sided PCB pre-drilled with silkscreen and solder-resist
- 3 versions available for maximum flexibility: see technical specification
- Empty PCBs are available separately, order code 70-9036
- Suitable for Key Stages 2, 3 & 4 (ages 11 to 16)
Product details Hints & Tips
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|Parts and quantities per kit|
|Order code||Description||Economy||With drive circuit||Deluxe|
|08-0275||100nF ceramic capacitor||–||–||1|
|11-0220||10uF electrolytic capacitor||1||1||1|
|18-0092||Battery clip PP3||1||1||1|
|21-0461||2–way 16A 5mm terminal block||–||–||2|
|22-0119||8–pin DIL socket||1||1||1|
|47-3142||1N4007 1A diode||–||1||1|
|55-1790||5mm red LED||1||1||1|
|55-1792||5mm green LED||1||1||1|
|76-0302||SPDT slide switch||1||1||1|
|81-0122||BFY51 NPN transistor||–||1||1|
Be the first to ask a question
1st January 2012
For anyone reading the above review, please ignore it. There are copious teachers notes provided via PDF which can be viewed before you buy. If anything, there are too many notes/diagrams as it leaves the students nothing to do, the idea is the teacher decides what information to give out depending on what level of students are being taught.
27th September 2011
Easy to build. One problem though, there are five resistors in this kit.. The students will drive you mad asking which resistor goes where.
Although a simple kit; a diagram would be nice.