Printed Circuit Boards (PCBs) are composed of a sandwich of alternating layers of insulating substrate and conducting copper layers. The copper layers are etched to form connecting tracks between components as well as earth/ground or power planes. The simplest PCB has one substrate layer and one ...

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21 views

MSK-12C01 a simple switch

https://wiki.microduino.cc/images/f/f7/MSK-12C01(1P2T).pdf Is this a 3 pins spdt switch? or 2 pins. If it's a 2 pins switch, which 2 are the connected one.
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1answer
46 views

Altium Power Plane Gerber inverted

Good Day I used internal power planes for the first time (Altium), and I now want to generate fabrication outputs in the form of Gerbers. The gerber below illustrates my internal GND plane, to ...
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1answer
55 views

Chip antenna, what to do with power and bottom planes

I'm designing a board which uses a chip antenna. According to the datasheet, there should be no copper on all layers under the antenna. There's also should be some ground plane on the top layer with a ...
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1answer
50 views

Altium: Two adjacent Prepreg layers in stack manager

Is there a way to add two adjacent prepreg layers in the Altium Layer Stack Manager? When you add a layer it adds copper as well, and when you remove the copper it removes the dielectric. I am ...
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2answers
79 views

Eagle: PCB layers stack-up and impedance

I had a PCB board with 8 layers to be fabricated. I have used an opensource deign modified it a bit and want to get them fabricated. The PCB company asked me to provide layer stack and impedance ...
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1answer
101 views

How to avoid rookie mistakes while designing a PCB?

I am not sure if its correct place to ask, I am going to ask it anyway. Its more of "Quora" question but since I am not so active there, I thought I would ask it here. So please bare with me :) I am ...
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2answers
135 views

Eagle and vias - board layout

I will start out by saying that I'm an electronics hobbyist and I'm currently in the process of laying out my first 4 layer board in eagle. Now all of the PCB manufacturers I've looked at either don't ...
5
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2answers
498 views

Do I need a via or stitching cap when I transition between physical reference planes of the same potential?

I have the following layer stack up Signal Ground Signal Power Ground Signal Ground Signal Layer 1-2-3 are tightly coupled Layer 4-5 are tightly coupled Layer 6-7-8 are tightly coupled Total ...
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1answer
70 views

What is the “Eco1.User” layer in KiCad?

In KiCad (Pcbnew), and perhaps other PCB layout programs, there is an Eco1.User layer and also an Eco2.User layer. What does the "Eco" stand for? And what are these drawing layers typically used for, ...
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1answer
94 views

Need suggection on spliting the power plane in a 4-layer PCB design

I am now dealing with a 4-layer PCB design. One of the internal layer is 3.3V power plane. As my circuit contains the sensitive analog part and the middle-frequency(about 100MHz) digital part, I want ...
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238 views

What are these black strips on PCB?

I found a board by dumpster diving. I am almost sure that it is SMPS board. I didn't understand black strips at the bottom of the PCB marked by red rectangles. By the way, it is a single layer board ...
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3answers
124 views

PCB tracing - Ground plane and Power plane?

Is it generally a bad idea, in simple or moderately heavy circuits, having two layers, to have a power plane in the top and a ground plane on the bottom? The tracing would become much easier, there ...
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1answer
89 views

Routing power into power plane (4 layer PCB)

In four layer PCB scenario with "standard" layer stack-up (signal, gnd, pwr, signal) how do you get power into the power plane? In my case, there is a voltage regulators sitting on top layer (SMD) and ...
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2answers
89 views

Altium Designer, Solder mask layer

I designed my first PCB and had it manufactured, but there was no solder mask on the manufactured PCB. Is there a specific setting that i need make in order to enable the solder mask layer? I am using ...
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3answers
127 views

Four layer PCB, leaks current on edges

I was testing a four-layer PCB and got electric shocks several times when trying to touch the edges of the PCB. The four layers are: top/+15V/ground/bottom layer. It seems that there are several ...
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4answers
701 views

Is it always possible to reduce the number of layers on a PCB by making the board larger

I see that a 2 layer PCB is really cheap to prototype. A 4 layer PCB is almost 4x more expensive . I have a design that uses DDR3 RAM where I need to match trace lengths. However I also need to keep ...
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2answers
100 views

How to etch Double sided pcb?

I am trying to etch my circuit on a double sided copper clad at home. After designing my circuit I took a print on tracing paper and used iron to get the trace on copper clad. When I used iron paper ...
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3answers
206 views

For a 4 layers PCB (with ground plane), covering with ground polygon on Layer 1&4 necessary?

For a single or double layered PCB board, usually I will cover all the empty spaces in the layout with Ground. This is the 1st time I am designing a 4 layer PCB layout. Layer 1: top signal (high ...
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1answer
59 views

How do I make a through-hole via? [duplicate]

Using a simple PCB with copper on both sides but naturally in between, is it feasible for a hobbyist to make through-hole vias like this: It seems there is copper in the via itself, isn't there? ...
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44 views

Eagle swap layers

I would like to swap two layers in the my 4 layer PCB. For example currently the ground plane is the Bottom layer, is there a way to take all the signals in layer 2 and move them to the Bottom layer ...
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0answers
155 views

PCB Ground and Power Plane Design Guidelines

I am converting a design from through hole components to SMT components. The schematic is identical, except the maximum allowable current through an onboard relay will be halved from 20A to 10A. ...
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1answer
193 views

PCB Stackup - Current return path

It is a well known fact that high speed signal would have return current path on the plane right beneath it's PCB trace. Suppose we have 4 layer stackup, SIG-GND-PWR-SIG with dielectrics ...
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1answer
124 views

What are “slash sheets”, and how do they relate to PCB substrates?

I am trying to specify the stackup for a PCB. Previously I have used whatever the board house considered to be their "standard" stackup. This time I am looking at using FR-408 (pdf) because of its ...
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2answers
611 views

Is it proper to use an internal layer as a heat bed if I want to warm my multilayer PCB?

I need to design a circuit to warm my PCB. There are many ways to build up such circuit. But I learned from a post "Warming PCB in a low temperature environment" that maybe I can use traces as heater. ...
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3answers
242 views

Is it possible to create a double layer PCB by gluing together two single layer PCBs?

I'm really in a hurry with a university project. I need to finish the first prototype of an electronics board by the end of the week. It's a through hole board, no SMD. Having just single sided ...
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3answers
153 views

PCB design few questions

Quick couple of questions, I am designing my first PCB and want to have a few boards prototyped with OSH Park. For a board I will be manually soldering components to, will I need to include a tCream ...
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1answer
86 views

PCB stackup for Mixed-Signal IC

I need to design high-density board with MCU, external RAM, GPS, GSM, Bluetooth, CAN, RGB interface on small size(5x10cm) and got into thinking which stackup should I use. Currently I have almost ...
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1answer
920 views

Assigning mechanical layers in Altium

I've just recently started designing my first PCB using Altium but am confused with the mechanical layers. I have a 4-layer board, and am placing components on both the top and bottom side (Through ...
2
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1answer
230 views

Understanding PCB layer stack-up shorthand notation [2:(1(2+345*67)*16):7]

I was given a PCB layer stackup specification like this: [2:(1(2+345*67)*16):7] For an 8 layer blind via setup. Could someone provide a reference to decode this ...
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1answer
71 views

Altium Connections

In Altium, does a multilayer Pad with the same net as a plane (internal ground plane in this case) automatically connect to that plane, or is a separate via required?
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1answer
94 views

How does this USB capacitive touch light circuit work? You can touch anywhere and it turns on, not just the electrode

Here are some pics of the circuit board. Now I'm not asking how the circuit works, I understand that. There is a capacitive touch sensor IC where the shiny electrode you see on top connects to the ...
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1answer
500 views

Connecting to a split plane in Altium

I am using Altium 14.0.9. I have a split plane on my inner layer of a 4 layer PCB. This split plane is connected to the net C6_2. It is basically 2 polygons on my ...
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4answers
1k views

Return path on a PCB

I've spent the weekend absorbing video lectures from Eric Bogatin and reading his book "Signal and Power Integrity - Simplified" He states that the the return path for the PCB may be any DC plane ...
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4answers
212 views

PCB Ground Plane

I am designed a PCB in Eagle and I am new to doing this. I have created a ground plane on the bottom layer that covers the whole board but I still have a few traces running through the bottom layer ...
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1answer
61 views

VCC powerplane layout

On a 4 layer stackup with signals routed on top/bottom; 2nd layer VCC powerplane; 3rd layer GND powerplane. How should the VCC powerplane be layed out? Should it be surrounded with a few mm of GND ...
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2answers
438 views

Mixed Signal PCB, 2 or 4 Layer?

I'm currently designing a mixed-signal PCB for a client and I've been reading a lot about signal integrity and most of the books recommend a 4 layer board (or more) because of the noise resistance ...
2
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1answer
64 views

Eagle tStop pad colliding with other pads

As you can see from the image, the tStop layer is colliding/wildly close with other tStop pad layer. Is that a cause of concern? IC is Linear Technology battery management IC - LTC4155. Package is ...
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4answers
582 views

PCB Tinning to increase current

How can I design a PCB in order for it to have this kind of PCB Tinning finish? I do know this decreases the resistance of the tracks and increases the amount of current it can handle however Do I ...
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2answers
3k views

Enabling extra routing layers in Eagle (paid version) PCB design

I started a PCB design in the freeware version of Eagle, now I have the full version, but it won't let me route tracks to the extra route layers (i.e: only top and bottom). Starting a new design in ...
2
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3answers
836 views

Can differential USB traces be routed relative to Power (not Ground) planes?

I would like to route my USB 2.0 (12MHz) signal on the bottom layer of a 4-layer PCB. However, the edge-coupled microstrips would then be referenced to the power plane, not the ground plane. The ...
2
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3answers
329 views

What is the best way to plate VIAs?

My local hackerspace has a CNC machine. I can give them my Gerbers and they can print out the PCB. The machine does not plate VIAs. I need to do this after the CNC machine is finished. What is the ...
4
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2answers
1k views

Gerber - is my understanding of solder mask layer (GTS / GBS) correct?

I've just had a PCB manufactured for me, but it seems like the solder mask is only applied to where the copper is. I'm trying to figure out if it's my fault or not. According to my understanding ...
2
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1answer
141 views

EAGLE: Delete internal layers

I'm doing a Layout and I have some problems deleting an internal layer. As you can see in the pictures below I have 4 layers (1, 2, 15, 16). But somehow I also have a layer called Route 3 (3). I get ...
7
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2answers
495 views

PCB's and designing power connections

I've designed a few PCB's now, but never put much thought into good practices. They were small boards and most of the emphasis was put into just making sure everything that needed to be connected was ...
3
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1answer
2k views

Hide particular airwires/nets in eagle

Is it possible to hide particular airwires in eagle, without hiding all of them? So if there's a net I am not currently interested in, but it has a lot of connections, confusing where other airwires ...
1
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1answer
159 views

8-Layer Stackup question

Alright. I was given the task to design an analog design board which contains lots of opamps, some CMOS switches and some ADCs/DACs. It also contains 4 separate power supplies (each supplying +5V and ...
11
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4answers
950 views

PCB, pads with holes but with different nets on top and bottom sides

I need pads with holes in by PCB, but the top and bottom side of the pads need to have different nets i.e. the top and bottom sides must be isolated. Here is the picture Is this possible to fabricate ...
2
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2answers
155 views

When is it theoretically possible to fit PCB circuit on x Layers (emphasis: x =1)

When is it theoretically possible to fit a given circuit on a certain number of layers? (Presumably PCB layers.) What is/are the name of the mathematics/algorithms that might determine this, or ...
3
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3answers
1k views

50MHz SPI PCB routing, use vias or resistors?

I am trying to route the SPI between MCU and ADC. However, the pin orders between MCU and ADC are not matched, there are crossings. A four-layer board is used.(signal - ground - power - signal) I ...
4
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1answer
714 views

Calculating differential PCB traces - Edge-Coupled Microstrip

I finally have the microstrip characteristic impedance thing figured out. But now, of course, I need to learn about differential signalling on PCB traces. I've spent some time researching. Here is ...