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The image on the left is a circuit diagram to create a flashing LED using a 555 timer integrated circuit, three resistors, two capacitors, an LED, and a 9 volt battery. By prototyping the circuit initially, an efficient and small printed circuit board can be used to connect components. Once its smallest capable size is established, an enclosure can be chosen to encapsulate the circuitry and give the device a more surveillance aesthetic. >> |