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Questions tagged [pcb-design]

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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0answers
15 views

MCP4011 - Exposed pad - connect to GND?

I'm planning to use an MCP4011-xxx/MC (DFN version). This package has an exposed PAD. But nowhere in the datasheet, I can find the information if this exposed PAD should remain NC or tied to GND/VSS. ...
3
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0answers
41 views

RF Differential and Single Ended Microstrip Impedance in PCB Design

In pcb design (using 4 layer osh park stack up) if the rf trace is single ended than i simply calculate microstrip impedance and draw copper trace with calculated width. For example for 50 ohm ...
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1answer
70 views

What is the PCB name of this speaker connector?

I am designing a PCB board in EasyEDA for a DIY audio amp. I have searched in several places to find the proper technical name of this speaker connector but I could not find it. I searched in Mouser ...
6
votes
1answer
72 views

Best layer stack strategy for a 6 layer PCB with mostly SMD components

I am doing a design in a 6 layer PCB where both sides are populated. 95% of the components are SMD. The design is not "High Frequency" in terms of signal speeds....the fastest thing here is a MCU with ...
3
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1answer
52 views

Having different voltage potentials as power planes on the same inner layer of a PCB

I am working on a 6 layer job which placement of the given components in the rather limited area that I have to work with...is driving me a bit crazy. I have no option but to have 2 different voltage ...
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0answers
91 views

First PCB project design critique requested (RF) EDITED

This is my first ever RF PCB project and it'd be great to receive some guidance to make this project 'first-time-right'. It's purpose is to transmit and receive signals at two different frequencies: ...
0
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1answer
31 views

LCSC parts for Coil & Capacitor

Greeting, I'm using This Schematic as a reference to create a customized BLE PCB board. I need some help to identify the below parts (with LCSC part No. if possible) as this is my first time to see ...
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0answers
63 views

How do you plan and check if a device will be compatible with every other device it will encounter in the field?

Hello I have a question that hopefully I can clearly state my question well enough. I work in television broadcasting and simply take off the shelf converters that take various signals and convert ...
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0answers
34 views

Switching to Altium from Eagle? (PCB CAD Software) [closed]

I am fairly competent at using Eagle, and can design a 2 layer PCB, design a basic footprint, and do most of the basic functions of Eagle fairly well. I know that Altium is the main software used for ...
5
votes
1answer
111 views

Connecting top and bottom SMD component pads using via

I am working on a 2 layer board and the PCB will be a double sided job. Some components on the top layer will have exact mirrors on the bottom right under them. My question is, for SMD components, can ...
0
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2answers
85 views

STM32F407 50 Ohm PCB

For STM32F407, it is recommended by the company that a 4-layer PCB be used to realize impedance matching. However in the Discovery STM32F407, a 2-Layer PCB is used. Now I am designing a PCB for ...
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1answer
113 views

PCB Layout validation [closed]

I'd like to know if the pcb layout is ok for the 2 op amps that i use.I'm interested in grounding and if the op-amps have proper layout(not too long loops or poor ground planes). source files The ...
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0answers
41 views

Need Help routing pcb for project [closed]

I am on Version 9.3.0 of Eagle and am working on a project for which I wanted to create a pcb. I have the required tools, and I am using an arduino nano as my microcontroller of choice.I had the ...
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0answers
20 views

Eagle PCB GND planes not show after ratsnest command

I poured my polygons on both TOP and BOTTOM layers ,but after i name them and click ratsnest the GND planes don't show up. The autorouter didn't want to route as it was stuck at 00.0% and finished ...
2
votes
2answers
103 views

How to achieve 100ohm impedance for HDMI differential pair on FR4?

I have a 6 layer FR4 PCB, and want to achieve 100ohm impedance on HDMI differential pairs. I am only using top and bottom layer for differential pairs, and following are my parameters: Trace width= 3....
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0answers
83 views

Problem with PCB making

I have followed a process to make a PCB, whose link is given below. I have followed the every process as mentioned with correct proportion of chemicals. But, unfortunately, this didn't work (traces ...
1
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1answer
91 views

5V Switching Regulator Problems

I have a circuit with two supplies. A 19v supply for stepper motors, and a 5v supply for driving the ATMEGA644, 3 stepper motor driver daughter boards, a bluetooth LE daughter board, and 2 ws2812b rgb ...
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0answers
20 views

Design pads and import to OrCAD PCB; or design directly in OrCAD PCB designer after importing other components?

I have a problem with layout design of pad. After creating the netlist and doing the routing, I want to add some single long pads to the board without packages to be able to solder wires on these pads....
0
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1answer
44 views

how to make different grounding

yesterday when i ask about driving circuit, someone told me that it is a little use in optocoupler when i use the same ground everywhere. because so far (iam a green hand in electronic) i just connect ...
1
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1answer
86 views

Would these traces cause a short?

I recently designed a circuit board, but now I'm looking and I believe that once the diode and capacitor are connected, they might be shorted. Thank you for your feedback.
0
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4answers
128 views

PCB with wrong 2N222 pin out

I finally got my first PCB through in the post today. Very happy with it, but I made a very amateur mistake in my excitement and eagerness to have it ordered. I seem to have used a 2N2222 part with ...
4
votes
1answer
135 views

PCB design review: analog routing

I am designing a PCB with analog signals for the first time, and I would really appreciate any feedback on my layout and routing. The circuit is a light-meter, consisting of a photodiode connected ...
2
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2answers
82 views

Routing traces over traces in two layer pcb

I am kind of new to PCB Design. I have a few confusions on my board layout, in order to reduce EMI in routing. I am designing a two-layer PCB design I am aware that when you route traces over ...
1
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1answer
38 views

TO-247 High Voltage pin clearance

I am using IXYH16N170CV1 IGBT's mounted at the edge of a PCB. The legs will be long and bent back to reach the heatsink shown in the image. This device is rated for 1700 V and 16 A. My nominal ...
2
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0answers
58 views

Why are project files in Altium modified every time they are opened? Is there a way to prevent this?

I use Altium Designer 18. When I open a project file (.PrjPCB), the asterisk ("*") appears next to the project name indicating that the project has been modified, but I haven't actually made any ...
5
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1answer
122 views

I2C Issues with First PCB

As a forewarning, this is my first PCB. I am experiencing issues with the I2C bus. There are two I2C slaves on this bus (SSD1306 display and BQ27441 Fuel gauge, currently the program only sends ...
2
votes
1answer
80 views

50 Ohm Board to Board Connector

I'm trying to build a tunable bandpass filter for 140 to 1500 Mhz, and the design requires that I move the signal from a PCB with an SMA connector to another mounted about 3mm above it. I'm using ...
1
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0answers
26 views

Strange powerplane layering issue in designspark

I'm trying to order a 6 layer PCB from a fab but they are asking me to resolve an issue with the file and I'm a bit stumped on what to do about it. The second layer of the design I have designated as ...
2
votes
0answers
31 views

Hexagonal hatched polygons Altium

I'm recently trying to design a flex PCB. I haven't been able to find any specific tutorials on how to do this in Altium. But I did find Altium blogs detailing some of the best design practices for ...
0
votes
0answers
50 views

Design carbon surfaces on printed circuit boards with Eagle

I am in the process of creating a circuit board that will later be assembled with conductive rubber for the buttons. For the contact areas I found that carbon is used (please correct me if I am wrong)....
0
votes
2answers
93 views

Schematic to PDF [closed]

I have 3 schematics files. I want to convert those to PDF format. I don't have the full version of software that can do it. Is there any other way to do the conversion? The free trial version is ...
0
votes
1answer
76 views

Looking for STM32F4 Vdd 5V

I have to replace Renasas M30853 MCU with STM32F407 MCU in a circuit. The earlier MCU uses power supply Vdd = +5V as well as all the analog and digital circuit that is connected with it. How can I use ...
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3answers
106 views

Ground Plane Tips for Beginners

I have made a few PCB's over the past few months as I have started to learn about design. All of the circuit boards have been Arduino based, so nothing to powerful. I design them up in Eagle and I ...
0
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0answers
21 views

Options for Routing Medium-High speed Digital Signals to Multiple Devices

I am working on a board with a DS90UB914 Ser/Des from TI which will relay its output data to either a CYUSB3014 or another chip which I have not yet decided on. Regardless, the DS90UB914 has and ...
1
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2answers
60 views

Does this circuit adequately represent the thermal considerations for a boost converter?

I'm new to electronics, and I'm trying to use a boost converter to get 5V at 1.2A from a lithium ion battery. I've selected the TPS61232 step up converter for this solution. The datasheet has a ...
1
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0answers
32 views

Placing a net tie underneath another component without the DRC error?

I'm using Altium Designer 19 and I have a ton of Net Ties many of which I'd like to place underneath other components. My net tie is just 2 6mil pads connected by a trace without any silkscreen or 3d ...
0
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0answers
60 views

FT2232H USB Device not responding

I've designed a PCB which contains FT2232H for UART and SWD debugging for a microcontroller in the PCB (STM32L0). The FT2232H circuit looks like this: and the power schematic that contains the USB ...
0
votes
1answer
55 views

Eagle Why ground pour is not connected to smd pads of components in a Module

I have created modules in my schematics, the Gnd pads of components in main schematics are connected to ground pour and does not have air wires. But SMD pads of components in the module have sir wires ...
1
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1answer
194 views

I am trying to PCB using a schematic I made

Routing isnt my strong point. I would like to know if this looks correct? So I have 230V AC to 12V DC. I then have DC coupling, then an LED emitter, transimpedance amplifier, then active high pass ...
4
votes
3answers
390 views

Modifying land patterns generated with IPC-7351B wizard

I generated a 4x4mm 0.45mm pitch QFN28 according to the Atmega328P datasheet: However, the pads on the corners (1+28, 21+22, 14+15, 7+8) are too close to each other, less than 0.2mm apart (when ...
7
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6answers
3k views

Male or female header on PCB? [closed]

I'm designing PCB which has pin header connectors(0.1" pitch). So my question is - Is it the standard to put female headers onto PCB and solder male headers to wires or vice versa? My idea is next: ...
3
votes
1answer
181 views

Shield in Inner Copper Layer

I have been designing second version of 4 Layer PCB. The PCB has connectors all over the PCB. In the first version, I had Copper Pour (I call it ...
7
votes
1answer
129 views

Why use marks on the PCB solder layer?

I was studying a Texas Instrument reference board and would like to understand some topologies and PCB routing techniques. The project is a 230-V, 3.5-kW PFC with >98% Efficiency. Here's the ...
0
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2answers
28 views

How can I allow a smaller clearance value for differential pairs in Altium?

I have finished routing a PCB in Altium (v17) and am resolving design rules violations. In short, everything checks out except differential pairs that are violating the ...
2
votes
2answers
126 views

Using polygon pours for small signals in PCB design

I'm trying to improve my PCB routing skills. When I started out a few years back, I just layed out the components and ran tracks with a fixed width between them. I didn't even know about polygon pours....
0
votes
1answer
68 views

MC78M12 voltage regulator without bypass capacitors in a simple PCB with only analog signals

I have a very simple board, two layers, two gnd polygons, 8 analog inputs incoming from 8 potentiometers and 8 analog outputs. In the PCB are 2 resistors (R1||R2) between input and ouput. So, output ...
4
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1answer
62 views

Is isolation between user accessible circuits and protective earth necessary for safety?

First let me say that I understand that this question is best answered by someone familiar with relevant standards (whatever those may be). Let me give some background. When I'm designing a board at ...
0
votes
1answer
66 views

Properly Grounding Analog/mixed ICs from DC-DC Converter

I am making a PCB with an Array of current DACs, which need ~15V, so I'm using a boost converter followed by an LDO. I've (tried my best) to layout the dc/dc & LDO per best practices but I'm ...
1
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1answer
135 views

What are these gaps in PCB polygon pours near vias of the same net?

When adding polygon pours to a power layer on my PCB in Altium Designer (v17), I'm getting weird clearance gaps near vias. The poly and vias are connected to the same net. I'm new to Altium, so I'm ...
1
vote
1answer
52 views

How to condition supply voltage for project

I am working on a circuit that is powered by a regulated 5V external power supply. However, since I will be directly powering a Micro-Controller from this 5v supply, I was wondering how I should '...