Parts Required
* resistors: 10k, 47k, 1M ×3
* presets: 100k, 1M
* capacitors: 0.01µF, 0.1µF, 10µF 25V radial
* transistor: BC108 (or equivalent)
* 7555 low-power timer IC
* 8-pin DIL socket for IC
* LDR (light-dependant resistor) type ORP12
* bleeper 9-12V
* on/off switch
* battery clip for 9V PP3
* stripboard 12 rows × 25 holes
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