Assembling our flasher PCB
The following figure is of the PCB design that is available for download from the Packt site (https://www.packtpub.com). This PCB is designed to fit inside a tube with a one-inch internal diameter. You will see the reason for this in a moment.
Flasher PCB
Assembly of the PCB is straightforward. I would suggest that you solder in the lowest parts first and work your way up to the higher ones. This way, the parts won't fall out when you turn the board over to solder them in. In this case, install the resistors first; then the LM555; and finally the capacitor and the transistor. You can also see how the LEDs have been bent at 90 degrees.
Finished PCB
