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.

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0
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1answer
19 views

How do I connect the certral pad of a QFN24 to the Ground in Kicad?

I need to connect the central pad of the QFN24 to the ground I got the package from the library that came with the Kicad (libcsm). I tried to edit the module and assign this pad to a number, then ...
2
votes
3answers
86 views

PCB design consideration for a SMA antenna

I am designing a PCB with the transceiver SX1231 (868MHz) with a SMA connector for the antenna. I don't know much about antennas. I would like to know if there is some parameters I need to be careful ...
-1
votes
2answers
79 views

cylindrical pcb design and casing

I'm trying to desing a control system that measures some analog signals like differantial pressure, temperature, motor current etc... and then produces some control signals and sends information to ...
1
vote
2answers
25 views

Altium clear region

I have a four layer board: Signal, GND (internal power plane), VCC (internal ground plane), signal. My design includes a chip antenna that requires a completely cleared region at the edge of the PCB. ...
0
votes
3answers
80 views

Securing a pcb to be used in a keyboard to its case

I'm looking for a way to secure a pcb I will be making for a cherry mx (homemade) keyboard to a case which I'll also be making. Obviously, I don't want the pcb to move. I could use standoffs/screws, ...
-3
votes
0answers
30 views

Why does Orcad Capture load slow on Windows7 [closed]

My company was using Orcad Capture CIS 16.2 on WindowsXP computers with the Orcad license server running on a local linux server. This has been working fine for years as long everyone was using ...
3
votes
1answer
62 views

Circuit Board Design Help (Novice) [closed]

I would like to see if the project that I am currently working on is something that can be done. Any help I can get would be much appreciated. I hope I am providing enough information. I am looking ...
2
votes
2answers
43 views

Passing copper traces between two THT pins

I've been working on a small project as an extra activity for a basic digital electronics course I was taking, in which I had to design a TTL-logic based PCB, and etch it. I've been using Ultiboard 11 ...
3
votes
3answers
73 views

Consensus on microstrip trace impedance calculations?

I'm designing a PCB that has a 2.4GHz signal that I'm routing to an SMA jack. I'm trying to figure out the geometry of the necessary microstrip trace. This is the first rf PCB I've worked on. The ...
0
votes
1answer
54 views

Headphone jack PCB connection

Im connecting a PCB mounted headphone jack to a circuit Im designing that takes a gnd, V+ and V- input from the 3 way 3.5mm headphone jack. However when I read its data sheet it has three connections ...
0
votes
2answers
78 views

Connecting copper pours in Cadence (OrCAD) PCB Designer

I'm trying to climb the Cadence learning curve, coming from an Eagle background. My board is four-layer, with a ground plane underneath the top layer. I have a surface mount IC that has an exposed ...
1
vote
1answer
34 views

Eagle PCB: how to get BOM from a library part?

I am using a library part in my Eagle PCB schematic. I would love to learn more about what's inside / what sub-components the library owner used to make it. Is there any way to do this? For example ...
2
votes
2answers
94 views

Minimal distortion in transmission line

In a transmission line, the condition for minimal distortion (caused by the line) are when (R/L = G/C) in the line, right? However, I don't see any reference to that in any application notes or ...
2
votes
1answer
56 views

Eagle PCB: “No Supply for Power Pin …” error

I am new to Eagle and trying to wire up a schematic. I have an IC and the first basic task I'm doing is connecting ground pins to a GND symbol. Here is what I tried with the error: (Note: I'm ...
0
votes
1answer
38 views

Is the Delay in Strain Data Due to Capacitance?

I have designed a sensor board which gives a strain o/p based on wheatstone bridge principle(change in stress is measured through change in resistance). But the starting value is not at zero level,it ...
1
vote
1answer
58 views

Avoiding solder mask in certain region in Altium PCB design

I want to have a region in my PCB without solder mask while the other regions should have solder mask. I am not sure how do I do it in Altium? Is it by having a Solid (copper) Fill in the Top/Bottom ...
6
votes
1answer
122 views

Trace width and clearance calculations

What is the math behind traces and clearance calculations? I am designing a PCB, which will carry 12V and 6A, what should be trace width and trace clearance? Similarly, what should it be for 12V 3A, ...
16
votes
1answer
402 views

Designing for High Acceleration

I'm looking into designing a board for a robotics application that is going to be spinning very quickly, and am wondering if there is anything special to take into account. It's going to be in the ...
0
votes
0answers
34 views

.bxl file for LDC1000 and DRV8839

Is there any site/source from where I can get the .bxl file for TI's LDC1000 and DRV8839 ICs? We need it for PCB schematics that use these two ICs, specially for the Eagle PCB schematic software.
2
votes
3answers
234 views

Is impedance matching a requirement for CAT-5e traces?

I'm building a patch-board for CAT-5e cables, whereby any pin can be re-wired to any other by a set of jumper cables. This is for testing black-box systems where weird things have been done to ...
0
votes
0answers
22 views

What is JTAG TCE signal designed for and what effect does it have on the boundary scannable IC?

I know for fact that some boundary scannable ICs don't have this JTAG TCE input signal but some does. Does any one know why?
5
votes
2answers
195 views

Is this a good layout for a 5A buck converter?

I have updated this question with the suggestions in comments and answers. Make sure you read everything. I want to make a PCB for a switching regulator (buck converter). It's a TL5001-based ...
4
votes
1answer
165 views

Optimal Placement of LED's

Not necessarily electrical, more engineering; I'm trying to build a UV LED exposure box to aid in the PCB etching process. There are plenty of guides around, but they all seem to involve haphazardly ...
17
votes
5answers
1k views

What reasons are there to avoid vertical through-hole resistors?

I'm working on a layout for a PCB and I need to include a handful of pull-up resistors. The board I'm working on will be a proof of concept, and it is likely I will only need one (and order two). That ...
8
votes
3answers
202 views

When should I use a ground plane?

I am new to PCB design. My circuit contain a voltage of 3.3V, maximum signal frequency of 400 kHz and less than 10 components connected to ground. Do I really need a ground plane in my PCB? Or to be ...
0
votes
2answers
65 views

stepper motor driver amp

I want to add a few amps to the output of a stepper motor driver (bipolar 4 wire) with out modifying the interns of the driver. MY QUESTION IS BEFORE I START I WANT TO ASK IF THERE IS A PROBLEM WITH ...
6
votes
2answers
143 views

Soldering guidelines for freezer applications?

I'd like to do a home project where I take temperatures inside of my freezer and inside liquids. Liquid-compatibility aside, I'm mostly curious about whether or not anyone can recommend some best ...
4
votes
1answer
65 views

Replace SMA Connectors with Direct Connection

I am combining the layout for two PCBs, one with an RF output SMA jack, and the other with an input jack, into a single PCB. We were originally connecting the separate boards with a ~3" segment of ...
2
votes
2answers
103 views

Verifying design that uses guard ring

I had a colleague design a board for pH sensor amplification based on schematic (fig 1)and spec in a paper. The paper recommends using the spec noted in figure 3. It uses a guard ring to reduce ...
3
votes
4answers
158 views

Import PCB outline made from connected lines from Inkscape

I have designed an outline for a PCB in Inkscape and wish to import it into Eagle, but the guides I have found leave me with lots of little lines in Eagle, not a continuous line, what's more is there ...
2
votes
2answers
69 views

Via through TQNF Exposed Pad

Is it ok to use an "ordinary" via to connect the Exposed Pad of an TQNF package to ground, as shown in the following picture? I am using eagle. DRC generates an "overlap" error, is it ok to ignore ...
2
votes
2answers
168 views

Altium: create a component that expands to multiple footprints

I am using a component that requires two headers to connect to it. I currently have a single footprint for this component that simply includes two copies of the connecting header. The problem I'm ...
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votes
1answer
90 views

How to choose the right transistor for a circuit and its associated resistor? [closed]

Please bear with me. It's easier asking you guys opinion than to Google. Especially choosing the right resistor when working with Arduino boards and transistors for relays.
2
votes
1answer
106 views

What are these double lines in Altium designer?

I have a problem with Altium: I want to know what these lines are. They look like a net with 2 perpendicular lines, but I don't know what it is! It's very boring to design my circuit. How do I ...
0
votes
0answers
42 views

Make your own GPU/CPU? [duplicate]

What would it take to make your own GPU/electronic transistor based device? I mean actually make your own transistors and grow them onto a chip, what equipment would you need, all I remember seeing ...
3
votes
1answer
138 views

What are the steps for a beginner to electronics to get custom PCBs made for a simple adapter?

I need to make an adapter between two 14-pin board-to-board connectors, one being a MicroMatch and the other being a JMC. What is the most straightforward way to get a PCB designed and ordered so ...
1
vote
0answers
73 views

ground plane on 2 layer board with wifi module

I have a 2 layers PCB that I mount a Wi-Fi module. Components (SMD) are placed on the bottom layer and the Wi-Fi module is on the top layer. I apply ground plane on both layers, as I read, it is ...
1
vote
2answers
113 views

Edit a silkscreen over a gerber file in Altium

I have some gerber files that are perfect, except the legend. I would like to include some useful information on the top silkscreen. is it possible to edit a new PCB using a gerber file as background ...
1
vote
0answers
62 views

How much larger should a bga pad be than the ball itself?

I've never had to do the layout for a board involving a BGA part until now. I'm curious what the rule of thumb is on oversizing the pad for the ball. What size pad should I use if a part has balls ...
3
votes
1answer
89 views

Question about analog and digital ground planes

I am using a microcontroller with an integrated DAC. On my 4 layer PCB, I have connected the digital and the analog ground planes below the microcontroller. The microcontroller and the DAC are ...
3
votes
2answers
187 views

How to construct this simple circuit properly?

I am a total newbie in electronics and circuit design. I am working on a project that involves a AC motor and four 1W LEDs. I found a motor that works for me and it comes with a AC/AC power adaptor ...
0
votes
1answer
60 views

Altium trace width rule applied to blanket only

In Altium, I set a rule for PCB trace width and clearances for a high current net but I only want it applied to that blanket that I have created in the schematic. I have monitoring lines that wont be ...
1
vote
2answers
209 views

Have I routed this PCB correctly per the schematic

This is my first PCB for production, and I'm not sure if I've correctly routed it. Mostly I'm concerned about trace running from pin 5 of IC1 to C3/C4 and how that picks up the +5V, which I've routed ...
0
votes
2answers
887 views

How to edit dimensions for PCB layout in proteus

I need a relay like this in proteus http://www.sanyourelay.ca/public/products/pdf/DI1U-K.pdf the DI1U-P type. unfortunately all the relay i found are not of the same size. please help me on how to ...
4
votes
5answers
280 views

Any tricks to attaching a wire or pin to a testpoint?

More and more often, I find myself needing to tear apart a device to seek out and connect to serial pads. These pads typically give me access to the underlying operating system for research or ...
1
vote
1answer
76 views

low-cost idea for Identifying passive tags by inductive coupling/pulses

Hi electronics experts, I want to build a circuit that can identify few (4-10) tags wirelessly by proximity. No need for multiple simultaneous detection. I don't need any memory on the tags - just a ...
2
votes
1answer
159 views

What is the schematic capture/PCB layout design cycle?

Is there somewhere a description or flow-chart of the process of designing a circuit: Requirements analysis, schematic capture, simulation, PCB layout, etc. as well as various checks? Something ...
2
votes
2answers
390 views

What type of antenna does the Xbox One controller use and how can you disable it?

I recently cracked open an Xbox One controller, the impetus for doing so was two-fold: First and foremost the engineer in me likes to see how things work under the hood as I learn a great deal that ...
1
vote
3answers
121 views

What design testing can I do before fabbing a PCB?

I'm an EE graduate who enjoyed the first taste of designing and fabricating hardware. My first board was a really low speed microcontroller board using mostly DIP and through-hole components, like ...
1
vote
2answers
214 views

What is this inductor looking (RF) component?

This PCB antenna circuitry supposedly is able to transmit on both 406MHz and 121.5 MHz. I can clearly see a micro-strip printed antenna. ...