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====== Circuit and PCB layouts ======
<color #db5f0b>Mar 2017</color>
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==== The Circuit Diagram ====
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Below is the circuit diagram for the Raspberry Pi NTP Clock. Bear in mind that I am using two Opto Isolators that are 8 pin packages, there are 16 pin packages that have enough connections that you can also use, it's up to you.
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Please also remember that this project only uses <color red>3.3v</color>. So yes you do still power the Raspberry Pi with 5v, but circuit only uses the 3v3 pin on the Raspberry Pi, all resistor values reflect the fact that I am using 3v3.
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{{ :7_segment_led_diag_w_comp_numbers.jpg?800 |}}
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==== PCB Layout v3.1 ====
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Here is what the PCB layout looks like (from the CAD drawings) I have not had any made yet, so this may be subject to change (I am writing this page Early March 2017).
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    Full PCB - All Layers
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{{ :pi_ntp_pcb_all_layers.jpg?800 |}}
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    Photo View 
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{{ :pi_ntp_pcb_all_layers_photoview.jpg?800 |}}
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    Top Layer Silkscreen
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{{ :pi_ntp_pcb_silkscreen_top.jpg?800 |}}
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    Top Layer Copper
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{{ :pi_ntp_pcb_copper_top.jpg?800 |}}
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    Bottom Layer Copper
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{{ :pi_ntp_pcb_copper_bottom.jpg?800 |}}
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    Outline Layer
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{{ :Pi_NTP_PCB_Outline.jpg?800 |}}
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If I have created this correctly, the PCB should be exactly the same size as the Raspberry Pi Zero (1, 1.3 and W) which is 65mm x 30mm (excluding edge connectors such as USB and HDMI) and the four corner holes should line up.
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===== Gerber Files =====
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If you wish to get your own PCBs made, you can use the attached Gerber files {{ :pi_ntp_3.1_gerber.zip |Here}}. However I have not had any made myself yet, so you might want to either wait, or create your own PCB.
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===== PCB File =====
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This is the PCB Layout file, produced in software called Sprint Layout v6.0 [[http://www.abacom-online.de/uk/html/sprint-layout.html]]. The PCB file can be downloaded {{ :pi_ntp_3.1_pcb.zip |Here}}.
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On the Sprint Layout website, you can download a free 'Viewer' for the PCB file so you can print it out. Please check their website for this software ([[http://www.abacom-online.de/uk/html/sprint-layout.html|Sprint Layout]])
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