RK Education 555 Timer Astable Projects
Brand: RK EducationThis range of projects has been designed to introduce the important concept of astable timers and pulse-width modulation using a 555 timer astable circuit.
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.
Comprehensive teacher notes are available here.
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.
- 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)
Image | Product | Buy Qty | Pricing (Ex VAT) | Type | Power | Frequency | Range | Soldering | |||
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| Astable project | N/A | N/A | N/A | Yes | ||||
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| Astable project | N/A | N/A | N/A | Yes | ||||
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| Astable project | N/A | N/A | N/A | Yes | ||||
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| PCB | N/A | N/A | N/A | Yes |
Parts & quantities per kit
| Order code | Circuit designation | Description | 'Economy' | 'With drive circuit' | 'Deluxe' |
| 70-6017 | 70-6018 | 70-6019 | |||
| 08-0235 | C1 | 100nF ceramic capacitor | 1 | 1 | 1 |
| 11-0220 | C2 | 10uF electrolytic capacitor | 1 | 1 | 1 |
| 08-0232 | C3 | 10nF capacitor | 1 | 1 | 1 |
| 11-2922 | C4 | 100uF capacitor | 1 | 1 | 1 |
| 18-0585 | – | Battery clip PP3 | 1 | 1 | 1 |
| 21-0461 | J1, J2 | 2–way 16A 5mm terminal block | – | – | 2 |
| 22-0107 | SK1 | 8–pin DIL socket | 1 | 1 | 1 |
| 47-3142 | D1 | 1N4007 1A diode | – | 1 | 1 |
| 55-1790 | LED1 | 5mm red LED | 1 | 1 | 1 |
| 55-1792 | LED2 | 5mm green LED | 1 | 1 | 1 |
| 62-0650 | R4 | 0R (zero Ohm) resistor | – | – | 1 |
| 62-0359 | R2, R3 | 270R resistor | 2 | 2 | 2 |
| 62-0373 | R1 | 1K resistor | – | 1 | 1 |
| 67-0408 | RV1, RV2 | 2K preset | 2 | 2 | 2 |
| 70-9036 | – | PCB | 1 | 1 | 1 |
| 76-0306 | SW1 | SPDT slide switch | 1 | 1 | 1 |
| 81-0143 | T1 | MPSA13 Darlington NPN transistor | – | 1 | 1 |
| 82-0336 | IC1 | NE555 timer | 1 | 1 | 1 |
