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How to connect top layer SMD pad to trace on bottom of PCB?
2845 11
bassblaster505 6 years ago
Hello! first time posting as i usually dont have any big problems, but im working on a 2.1 Amplifier from TDA chips (link at bottom) and im trying to figure out how to connect an SMD pad on the top side of the PCB to a GND trace on the bottom side. i want to keep all my Vss and GND traces on the bottom and the rest on the top. https://easyeda.com/bassblaster505/TDA_2_1_Amplifier-6eb528577e8f4e1db16f0f7ebdba6fae
Comments
dillon 6 years ago
Why not to add a `VIA` .
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bassblaster505 6 years ago
So add a VIA directly on the SMD pad to the GND trace at the bottom? i dont see what that wouldn't work.
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andyfierman 6 years ago
Run a trace out from the pad then - from the wiring tools floating toolbar - place a via and swap to the Bottom layer (`B` key) to continue the trace. Using the Hotkeys: 1. Select the top layer: `T`; 2. Enter tracking/wiring mode: `W`; 3. Left-click to start and right-click to end a section of track; 4. Select a via : `V`; 5. Left-click to place and right-click to exit via mode; 6. Select the bottom layer: `B`; 7. Enter tracking/wiring mode: `W`; 8. Left-click to start and right-click to end a section of track. Note that it is bad practice to put vias inside SMD pads. It may be OK for hand assembly but not for any kind of automated assembly. See: https://easyeda.com/editor#id=a0cf7282b35140928ab93bc65c4b9cfb https://easyeda.com/forum/topic/The_best_way_to_design_a_PCB_in_EasyEDA-ThR3pwqIC and: https://docs.google.com/document/d/1CU7RuPyFlSZPzWBN-YZ0x87xeAB4xpLdLaIsUwhLj_M/edit?usp=sharing (I am in the process of writing this detailed tutorial on how to create a schematic and then do a PCB design. It is a work-in-progress and will eventually make it onto the EasyEDA site but it is useful as it is right now and you can see the current draft at the above url.) * If you are the creator of the **Multiwatt 11** package PCB footprint can you delete the reference in it to `Package Multiwatt 15` as this appears to be a mistake and is confusing? Thanks.
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bassblaster505 6 years ago
Yes I Made the Multiwatt 11 package by using the default Multiwatt 15 package with 4 of the pins deleted as there were no good Multiwatt 11 packages. How would i go about fixing that error? But on my PCB i got the SMD pads and placed a VIA next to it.
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andyfierman 6 years ago
Search for your **Multiwatt 11** PCB footprint in My Parts (Click on **Parts** in the left hand panel or do SHIFT+F). Select and Open it for editing in the PCB Lib Editor (Double click on it in the list) and then detele the text in the `Package` field in the right hand panel. Save and Close. * What would be really helpful is if you could add a Description along the lines of: `Suitable for TDA7396 amplifier` and for the Multiwatt 15 package: `Suitable for TDA7297 amplifier` You can add this Description by **Right-click > Modify** on the package in the list. Even better, if you are the creator of the TDA7396 and TDA7297 schematic symbols, in the same way, please add a link to the manufacturer's Device page and a link to the manufacturer's Datasheet for each symbol.
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bassblaster505 6 years ago
In my Schematic i actually made BOTH TDA7396 and TDA7297 libs as i didn't find one that suited me, But i will edit that and add datasheet links.
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andyfierman 6 years ago
@Bassblaster505, Many thanks.
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Mark Schuurman 5 years ago
Yeah, a `Via`turned out to be the way to go for me after a couple of hours of strugling. Finally I insterted this `Via`on TopLayer, and in the Object Properties Menu I assigned the relevant `Net`to it. Only after this assignment the `Via` was connectable to other paths and components.
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MikeDB 5 years ago
@mark_7380 For a power amplifier or any other power application, a single via is not enough to take the current.  Always use several vias of at least 50mil pad/25mil hole size.
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Mark Schuurman 5 years ago
@MikeDB thnx for notification, which in turn raises my next question: I'm working on a little board that will feed and read 4 sensors of my e-bike securely towards a MCP3008 A/D. I want to provide the sensors 12V (bottom layer). One of them will return (Gear) a steady voltage of 8V max. Rest of the sensors will return only any signal if their Hall is aligned, and will be 12V max. Is your estimation this cannot be done with 0.6 mm (23mil) pads and 0.305 (12 mil) holes? TIA!
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MikeDB 5 years ago
yes - signal level current are fine through a single standard via, though since it's a harsh environment you might want to consider doubling up all your vias in case vibration cracks one of them.  JLCPCB don't seem to charge 'per via' like some PCB manufacturers so no harm in playing safe. It's just the power to the ICs, LEDs, etc, where you need larger vias and more of them.
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