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.

learn more… | top users | synonyms

0
votes
0answers
27 views

Altium via ring vs. hole clearance rule

I would like to setup different clearance rules for via hole vs the via pad (ring) in Altium. The context is that i am removing unconnected via pads on the inner layers and my board house has ...
3
votes
2answers
49 views

Which traces should I fill / pour?

What are the general rules of filling / pouring traces? What traces should I pour? I assume ground is poured most often. Should I pour other traces? Supply/Signal or something else perhaps? What are ...
2
votes
1answer
54 views

Via's without annular ring on internal layers

My PCB layout package (Altium) has an option to define the full stack of a via so one may have different sized annular rings on different layers. I was wondering if it is considered "manufacturable" ...
3
votes
1answer
54 views

Board structure relative to ground plane

I'm sorry if this question has already been asked, but I did not reach a full understanding of this subject area.I have read several guides for PCB layout, including the articles on this site. And now ...
6
votes
3answers
266 views

How to connect these pads

I have trouble connecting a THT HDMI Connector to a pcb: The HDMI Connector I'm talking about is this. The holes are too close to go in between them: (The blue line is 0.15mm thick) Is this ...
1
vote
1answer
49 views

PCB/SCH Design: Fuse w/ Holder

How would one go about creating a library component for a through-hole fuse that sits in a holder? The part in question is this: Fuse: ...
2
votes
2answers
88 views

How can I better label my PCB?

I am working on a Teensy 2.0 clone for general learning in circuit design. The autorouter of CircuitMaker was able to route my board. Now I just have to clean up the aesthetics. I am trying to ...
-1
votes
1answer
77 views

Why are LCDs and their controllers (HD44780, etc) hard to find as a consumer direct from their manufacturer? [closed]

I've been researching the development of an arduino-compatible with a built-in 16x2 character LCD, and have had no success finding anywhere to directly buy a LCD screen and the controller without ...
2
votes
1answer
78 views

Analog & Power Ground Planes Doubts

Working on a new board, I have to face some requirements to ensure the performance of the whole system once is manufactured. PCB is a 4-layer one, and it has both analog and digital components. But ...
6
votes
3answers
347 views

Panelization (& Depaneling) a Metal Core PCB

What is preferred way to panelise a Metal Core PCB (MCPCB) - V-scoring or Tab-routing? The engineering challenge I am facing is that the boards are meant for production (1,000 qty in the initial ...
0
votes
1answer
28 views

Pads for wire connection in KiCad

It's my first time making a PCB. I've got pretty far with all the YouTube tutorials however I'm now stuck on what to do next. My PCB is going to be made up of WS2812B chips (4 pin LEDs comprising VDD, ...
0
votes
0answers
49 views

Reason for radio device functioning only when connected with cables between connectors

I have a prototyped board with a 2x4 female connector which is supposed to connect to a NRF24L01+. If I plug it in directly it's not working, however if I connect cables between them everything is ...
1
vote
0answers
105 views

Text LCD doesn't function normally on mixed-signal PCB?

I have power supply, analog part and microcontroller part on one 2-layer PCB board, very simple. The LCD is on the microcontroller part. It works normally when I have it on a separate board with only ...
2
votes
1answer
47 views

Relay EMI. Should I be worried?

I am using PCB soldered relay to switch 8-10A 220V appliance. Out of curiosity, I tried to visualize the EMI being radiated from arc sparking. I attached the GND to Neutral pole of proble and kept the ...
-4
votes
2answers
69 views

I am interested in circuit designing .How should I start with it from scratch? [closed]

I am a 2nd year btech student in electronics and communication engineering.
0
votes
3answers
38 views

Via fences or pickets important parameters for design

What is more important for EMI shielding effectiveness with respect to guard traces and via fences, the width of the copper trace that circles around the area or the distance between the vias to ...
1
vote
1answer
59 views

Hot Glue/Epoxy-like substance on DC-DC regulator

I have a board (an evaluation module for a USB-to-HDMI chip from Microchip) that has a feature I haven't seen before. On top of the 3 DC-DC regulators, there is a clear substance that appears to ...
0
votes
0answers
26 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 ...
0
votes
1answer
72 views

Fire Alarm Circuit using transistor

This circuit is working inversely on PCB as compare to Proteus Software. In software, when the temperature increases the buzzer is on. This is the desired output, but on PCB this circuit is working ...
0
votes
0answers
50 views

Can the decoupling capacitor for WS2812 be further away?

I have (many) sticks of 8x WS2812b already soldered and completed. Now I've read that it would have been a very good idea to include a 100nF capacitor for each chip on Vcc. I haven't designed the ...
0
votes
1answer
57 views

Two flyback diodes in parallel across a relay coil?

I'm using relays that contain a flyback diode internally, so no need to add an external flyback diode. However, I want to provide a place on my PCB to possibly stuff a flyback diode in case I would ...
0
votes
1answer
57 views

Easy PCB trace width calculation

I've tried this question and this and several other possible duplicates of this question, but I still can't wrap my head around this. I'm using OSHPark for PCB production. They support a minimum of ...
0
votes
1answer
59 views

PCB track width for MHz frequency

I am designing an DC to AC converter operating at 10MHz. Its a low power converter and the input current is under 2A. What PCB trace width should I use and can someone give me a guideline on how to ...
3
votes
2answers
418 views

Place a component on specific height above the PCB

what I have as a big issue is the following layout with two connectors. The problem is that the connector K201 (in right bottom) is very close to the frame. This frame will the attached to a device so ...
0
votes
1answer
49 views

how to calculate power budget calculation for new project? Need basic steps to start

Could you please let me know how to calculate power budgeting of new project. What are the things i need to consider while power budgeting. what are the main points keep in mind while doing safe and ...
3
votes
2answers
108 views

What's the point of this thick trace in my PCB?

I'm looking at a trace that goes from Pad 2 of a component to pin 22 of the QFN. What's the point of the thick trace at the beginning if it ends up being as small the pin where it is run?
0
votes
3answers
82 views

Incorrect drill diameter for Molex 5569 Mini-Fit Header library in Cadsoft Eagle?

I have been working on a simple 2-layer PCB primarily intended for routing various power connections (essentially acting as a power distribution junction) to clean up the cabling in my enclosure. I ...
1
vote
0answers
91 views

PCB Ground and Power Plane Design Guidelines

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

How can I switch two wires using solid state relays?

I want to add a "reverse" function to a brushless motor ESC - in theory, it can be done by simply switching any two of the three output wires - I would like do to it via solid state relays, but I am ...
0
votes
0answers
67 views

Building a solar powered USB charger

Can some one please help me ! I'm new to electronics and I have been building my own basic ones, but I have decided to step it up a little and design this. Could you tell me if it would work ? If ...
0
votes
1answer
72 views

PCB chip/trace antenna located away from board edge?

I'm looking to design a system that will require a 2.4GHz antenna. The only problem is, every single reference design I find has the antenna situated on at least one board edge. Unfortunately due to ...
3
votes
1answer
110 views

Altium Designer Unknown Pin

I've been bashing my head against a wall for the last day trying to get this to work.. I have a custom schematic and pcb library, when I try to update my pcb document I get the following error: I ...
2
votes
1answer
285 views

2.4GHz antenna feed routed through pcb via?

I'm working on designing a BLE device, and have settled on using a chip antenna. It seems, however, that my BLE SoC is going to have to be on the underside of the board, which might be significantly ...
0
votes
1answer
47 views

Voltage drop in Analog inputs due to long traces length

I am using ADS1278 chip. Analog inputs to this chip have been routed in differential pair manner. The differential pair inputs trace length is maximum 9 inch within the board from the ribbon connector ...
2
votes
1answer
83 views

Crystal PCB track

This is my current PCB crystal set up. The crystal run at 16 Mhz. Any thoughts/comment? Links: MCU - Datasheet TI PCB guideline Tiva C - Here
0
votes
0answers
48 views

Steps from schmatics to PCB layout - EAGLE

My question is: What are correct steps to route connections in a 4 layer PCB? in EAGLE. I've designed PCB schematics and switched to board, I've placed all components in strategic positions on top ...
2
votes
3answers
80 views

Can I make a double board at smart prototyping pcb service?

They have a 5x5cm minimum board size. My board is approx. 35x20mm so I can easily put two side-by-side and thus double the board count within this limit. What is the best way to do this? I know how to ...
0
votes
1answer
61 views

Altium Designer - split plane

I want to make a plane for my supply on my PCB and a plane for my MCU to isolate the MCU from the power supply noise. I found this article in Altium designer resource: But it isn't clear how the ...
0
votes
0answers
54 views

Can I use General Purpose Printed Circuit Board for any voltage or current rating?

The thickness and width of the copper pad (1 ounce/ 2 ounce) depends on the current that will pass through it. Can the General Purpose PCB withstand high currents (up to 15/20A)? If not, is there ...
0
votes
1answer
88 views

What constitutes a Via-in-Pad?

Would any of the via's in the picture be considered a via-in-pad? or is it only if it's dead center of the pad?
12
votes
4answers
993 views

Why is it so hard to find component footprints?

When designing PCB's, I find myself very often having to make footprints for a significant portion of the components on my board. This tends to be very time-consuming, as (in Altium at least), ...
0
votes
0answers
52 views

how to create connectors for hollow pad in Fritzing

I have manage to create a circular hollow pad that I want around a PCB. Now I would like to add the connectors so I could attach parts to it and I could not manage to open the file in Fritzing part ...
9
votes
3answers
1k views

What does a race condition mean?

I'm a new electrical engineer so bear with me. I hear some of the other engineers I work with talk about a race condition that exists in one of our circuits. What does that mean?
1
vote
1answer
93 views

Reused MCU unit does not work

I had a board with ATMEGA16 (SMD package) micro controller and I had to program through ICSP and it was working fine. Later I needed to make some changes on the board. So I designed a new board and ...
1
vote
3answers
76 views

PCB Holes Too Small to Fit Component

Based on the VSK-S25 datasheet which states the holes to have a diameter of 1.5 mm, I used the following values in EAGLE When the PCB is made, it turns out that the pins of VSK-S25 are too ...
0
votes
1answer
51 views

Two 2.4GHz radio modules (XBee+Bluetooth) on same PCB. How to minimize interference?

I'm designing a PCB with XBee radio module and a bluetooth module (RFDuino SMD with XBee 2mW Radio). Since both of these modules are using 2.4GHz, are there any special consideration about how to ...
0
votes
2answers
202 views

VSSOP-8 Package Footprint

I am trying to create a footprint for a LMR61428 but the datasheet (linked) only has the package outline and nothing for the recommended land pattern, or footp for a PCB design. I found this image on ...
14
votes
3answers
2k views

Why are vias bad?

I am designing a PCB with EAGLE and saw that it was trying to limit the amount of vias through the PCB. Why do you want less vias? Why are they bad? Do they bring extra manufacturing cost or is it ...
0
votes
2answers
41 views

Function of undocumented pads on PCB mount power module

I'm hoping someone may be able to explain to me why are there extra pads on the bottom of APXW003 DC/DC SMPS PCB mount module from ProLynx series from GE Industrial. I am doing a design and it turns ...
0
votes
3answers
86 views

Autodesk Autocad for PCB design

I recently completed an Advanced Diploma level course subject for PCB design that taught Autocad as the design software. Whilst I am aware of the power of Autocad my subsequent surveying of ...