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| First pcb |
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| Tom10000:
Hello, I have just finished my design of my first PCB it is of a lm317 power supply I am worried that I didn't do it correctly please could I have some feedback on what to improve on. I Have attached the Gerber Files below. Thanks, Tom10000 |
| Nitrousoxide:
Please upload them as images (or PDF's) as many people on the forum do not like to download zip files. Its easier for users to view and you're more likely to get an answer. |
| Tom10000:
okay thanks, I have now attached a photo |
| ataradov:
Traces are too thin for no real reason. An also too close to each other and pads. The routing looks all over the place. Some component shuffling may help with that (just rotating PR1 90 degrees clockwise will make routing much cleaner). There is also no mounting holes. But generally, it looks functional. If you plan to order the boards, then do a double sided routing and ground fill on both sides. |
| pigrew:
I agree with ataradov, especially about using a ground plane (at least on the bottom side). Also, make your input and output tracks (along with GND) much wider. Review the datasheet again about components and placement suggestions. For example, the TI sheet specifies the 0.1uF or 1 uF ceramic or tantalum input capacitor to be as close as possible to the LM317. Your 0.1uF output capacitor looks too large... you should be able to get one with 0.1 or 0.2in pitch. You may also want to add a heat sink for the LM317. If so, make sure you have ample room on the board to add it (and perhaps add places to solder the heatsink down for mechanical support). |
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