After breadboarding the components, the next step in the design process was to create the circuit schematic in software. The application used for this was the free version of Eagle PCB. Since I was new to the software, I did some googling and found an great series of basic tutorials on YouTube by RCP Electronics.
Designing a PCB is a two step process in Eagle. You first create a schematic to layout the components and connections, then create a board from the schematic. Using Eagle was fairly intuitive, except for finding the components to add to the schematic. After some research, I settled on the following components in Eagle:
PINHD-1X2/90 (for the 90 degree 2 pin headers)
R-US_0207/10 (for all 1/4 watt carbon film resistors)
DIODE-DO41-10 (for the 1N5819)
C-US050-025X075 (for C1)
CPOL-USE5-10.5 (for C2)
DIL8 (for TS555CN)
GND
These components were added to the schematic and connected using the wire and junction tools. The Tools | Erc menu option was used frequently during the drawing process to ensure that all connections were valid. Since the enclosure for this project was not conducive to placing all components on the PCB, 2 pin headers were used on the schematic so that the devices could be connected from a distance to the PCB. The final schematic is shown below.
Once the schematic was completed and contained no errors, it was time to move to the PCB creation process.
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