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RK Education 555 Timer Astable Projects

<P>This range of projects has been designed to introduce the important concept of astable timers and pulse-width modulation using a 555 timer astable circuit.</P><P>Three versions are available - Economy, 70-6017; With drive circuit, 70-6018 and Deluxe, 70-6019. The three kits all use the same PCB, but have a different set of components. Please see the Technical Details tab for more information. </P><P><A href="/pdf/70-6017_555_astable_v3.pdf"><B>Comprehensive teacher notes are available here.</B></A></P><P>This circuit is very important as it features heavily in KS4 curriculums. The range of projects has been designed to have more than one possible outcome and therefore more than one application.</P>
  • Frequency can be varied by adjusting the two variable resistors
  • Battery-powered
  • Clear silkscreen text has been used to make construction simpler
  • Professional double-sided PCB pre-drilled with silkscreen and solder-resist
  • Empty PCBs are available separately, order code 70-9036
  • Suitable for Key Stages 2, 3 & 4 (ages 11 to 16)
Parts & quantities per kit
Order codeCircuit designationDescription'Economy''With drive circuit''Deluxe'
08-0235C1100nF ceramic capacitor111
11-0220C210uF electrolytic capacitor111
08-0232C310nF capacitor111
11-2922C4100uF capacitor111
18-0585Battery clip PP3111
21-0461J1, J22–way 16A 5mm terminal block2
22-0107SK18–pin DIL socket111
47-3142D11N4007 1A diode11
55-1790LED15mm red LED111
55-1792LED25mm green LED111
62-0650R40R (zero Ohm) resistor1
62-0359R2, R3270R resistor222
62-0373R11K resistor11
67-0408RV1, RV22K preset222
76-0306SW1SPDT slide switch111
81-0143T1MPSA13 Darlington NPN transistor11
82-0336IC1NE555 timer111