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About designing the boards which carry the components of an electronic circuit. For questions about getting them built instead use PCB-fabrication. If your question is specific to a certain CAD tool, say which tool and version you are using.

4
votes
But what about internal layers? - Is it problematic to have a supply and ground layer going across the predetermined breaking point? Its not a definite problem to leave an internal layer and a …
answered Apr 10 '17 by Voltage Spike
1
vote
RS485 uses differential signaling for the cable of 100Ω or 120Ω, the terminating resistance should match the cable. While it is not necessary or a requirement to match the PCB 'stubs' it's probably a …
answered Jun 4 by Voltage Spike
0
votes
1) Keep 2 layers or go through 4 layers? (1 gnd plane and 1 power plane, 2 signal layers) If the board is already routed, then keep 4 layers. I would think it would be difficult to keep the imp …
answered Jun 4 by Voltage Spike
3
votes
Mechanical reasons, the more copper around connectors the better so if your worried about it ripping off of the board more copper will give you more leeway before it comes off the board. You will ge …
answered May 13 '17 by Voltage Spike
3
votes
Lets just say you split the 15mil trace into two 7.5mil traces. Most manufacturers will need a 5-7mil spacing between traces, so instead of 15mil of width, you have 20-22mil. You just made routing mor …
answered Nov 28 '17 by Voltage Spike
2
votes
The square pin usually means it's pin 1. The polarity is up to you. Look at the 1x3 or other headers with more pins in the library, this will make more sense.
answered May 7 by Voltage Spike
4
votes
Here is an example of how a clock may be routed (although you can see pins 3 and 4 are not connected to ground, depending on the oscillator they could be). The advantage here is one plane surrounds th …
answered Aug 8 '18 by Voltage Spike
0
votes
A better way is to learn how to model parsitics. A piece of copper (or any conductor for that matter) functions as an inductor and resistor. If you have two pieces of metal, they form a capacitor. S …
answered Jul 28 '17 by Voltage Spike
0
votes
4answers
I copy and reuse portions of a design, I'll copy and the designation numbers follow the copy (for example: I'll have U1 and R2, then copying you end up having to U1's and two R2's, I don't want that.) …
asked Mar 1 '17 by Voltage Spike
2
votes
The first thing would be to add up all of the areas (or group them in altium) and see what area they take up, your board needs to be bigger than this area. You also need to account for via's and tra …
answered Aug 9 '17 by Voltage Spike
0
votes
Are my apprehensions having a reason to exist, or I am over-complicating things? Adding a dedicated ground plane can make a difference by: Lowering the inductance of the return current pathwa …
answered Jun 22 '17 by Voltage Spike
1
vote
2answers
I have two inner layers in altium for a flex cable, I want to swap one copper layer with the other without having to delete or copy everything. Is there a way to swap two PCB layers while maintaining …
asked Jun 15 '18 by Voltage Spike
0
votes
NC or 'No connect' usually means 'Not connected', unless the datasheet says otherwise. DNC or 'DO NOT CONNECT' means do not connect for any reason. (and is could be a factor pin used for manufacturing …
answered Mar 22 '17 by Voltage Spike
3
votes
There is nothing wrong with a using a tool like kicad to do high speed design. In the end all that matters is that the design and gerbers are drawn correctly to give the correct impedance and lengths. …
answered Jul 26 '18 by Voltage Spike
1
vote
The idea with guard rings is to prevent leakage current. FR4 has a volume resistivity (varies from manufacturer) as low as 10^14Ω cm. What you have is most likely sufficient for the leakage current yo …
answered Jun 14 by Voltage Spike

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