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.

229 questions with no upvoted or accepted answers
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429 views

Ethernet Interface PCB layout requirement (if any)

I am doing Ethernet communication to/from an MCU. I got it working great with an ENC28J60 development module: https://www.digikey.com/product-detail/en/olimex-ltd/ENC28J60-H/1188-1044-ND/3471433 I ...
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390 views

TRRS 3.5 mm Audio Plug (male) into a printed circuit board

Have a device I'd like to plug into a headphone jack of a cell phone. Wanted to start making some more professional prototypes; print my first circuit boards, etc. I'd like to be able to implement a ...
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716 views

Altium overlapping room on top and bottom layer

I am trying to do a 4 layer PCB (The 2nd layer is Ground and 3rd layer is VCC). While I am placing overlapping rooms on top and bottom layers, then after placing the rooms, when I try to move a room ...
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213 views

Query regarding RF trace width maintenance in a PCB Layout

I have a query reg. RF PCB design This image is the "output end of a power amplifier(PA)", which gives 1.5-j1.7Ohm impedance at output pads(12th & 10th) of the PA. And then it is being matched to ...
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412 views

EAGLE hiding pad(s) value(s)

I want to edit Eagle's PCB con-amp 1-794681-8 connector part in way its pads will show only numbered in PCB Design Window, which means without its values, as is my current situation: The problem is ...
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55 views

Printing resist onto paper pcb

Is there a paper that can go into a printer to be used as a pcb? Basically what I'm looking for is a silicon sheet with a thin layer of copper on top that ink can be printed on to be used a resist. ...
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392 views

Beginner, how to connect a rechargeable battery to be able to power a 12 Volt Fan and a 5 Volt TEC/Peltier (or 5 Volt Fan/Peltier)?

Firstly, I want to say thank you for looking at my question. I am trying to make something for my nephew, but I really don't have much experience in electronics, even though I have been researching it ...
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224 views

stack 0805 sized component on 1206 sized footprint

I wonder if it's generally okay to stack an 0805 sized footprint over a 1206 footprint, without any problems in the assembly machine?
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129 views

What are the precautions to take when building circuits powered over USB from a Laptop?

I am working on a rather simple embedded system project which involves an hardware USB enabled AVR chip communicating with a host of other devices and a solid state relay which is used to make or ...
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83 views

Simple capacitance sensor on PCB - how to draw?

I have implemented simple soil moisture sensor and now I would like to create PCB for it (I have prepared couple of prototypes using waterproof marker). My general question is, what is the right way ...
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59 views

Use a device in the board that is not listed in the schematic in Eagle

I am making the design of a PCB. The problem is that I need to use a device that is not listed in the schematic from a library that I downloaded. The next image shows how is not listed: But it is in ...
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96 views

Avoiding EMI with crammed radio PCB design

This is the PCB I'm almost ready to put into production. In the picture, the parts are laid on a 1.27mm grid. Every component and track has at least 10mil clearance. The smallest track size is 10mil. ...
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192 views

Replace CR2032 by li-ion reverse engineering

I want to replace my Wireless door bell by lithium-ion 3.3 V-4.2 V but I don't know if the circuit is design for that. It work with CR2032 3 V max. I think I identified Attiny85 on the PCB, I can ...
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67 views

Altium - Strange issue with Library part

I see a strange issue while placing the above library part on the PCB file. After placement,the silkscreen and mechanical layer gets an offset .Any suggestion what could be the issue?
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190 views

Eagle board editor diode wire problem

Good day. I created schematic with diode on it: But on board are anode and cathode connected. I dont understand why. Thanks. Update: Full schematic:
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381 views

Connecting a 5V 10A 2.1mm x 5.5mm Power Supply to a PCB

I have designed a system to control LED light strips (Adafruit NeoPixel strips) using an Arduino from a C# program in Windows. I have been through the prototyping phase with a breadboard and a single ...
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414 views

Opentherm protocol - pcb design question

I'm challenging creation of PCB that would allow me to talk to my boiler using specifics of so called OpenTherm protocol. Till now I have learned the following: Polarity is interchangeable on ...
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369 views

AC resistance of thin PCB trace

I want to calculate the AC resistance of a thin pcb trace. The complication here is, that the trace is already close to the skin-depth, so the standard formulas that I found on the net don't apply. ...
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51 views

Cannot find ATSAMS70N21A-AN lead width and lead length?

I have trying to make a breakout board for ATSAMS70N21A-AN. I then tried to design the footprint in KiCad, so when I was looking for the dimensions on the datasheet I couldn't find the lead width or ...
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360 views

PCB Layout with AGND and DGND

I have to start a layout for a PCB soon, and it contains both AGND and DGND. All the components will be on the top layer of the board (micro-controller, voltage reg, SD card, Inst. Amp etc.) so I am ...
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157 views

How to properly develop a PCB everytime without taking too much photoresist off

Its been a while since I made a good PCB and I can't remember what I did to make it perfect, but after reading various resources, I have determined the following as to why most of my design was ...
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1answer
418 views

Need a little help with a Chinese tesla coil

I bought a little tesla coil kit that can play music. I soldered it all up, and a friend of mine distracted me at the last second when I was hooking it up... I blew the original "BD243" transistor up ...
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1answer
82 views

EAGLE GERBER files nit opening in CAM 350

I have chinese factory that I need to assemble PCB. They cannot open eagle gerber files, only altium how to fix
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1answer
161 views

Clock oscillator pin, requirement, ac-decoupling and termination

I'm trying to make something with ADI PLL (ADF4159 and ADF5901). In their datasheet there is nothing about how to source the clock pin. I have found lots of information about clocks on the internet ...
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1answer
665 views

kicad problem: Unconnected pads

I finished the routing and the copper pour but this problem showed up. I don't know what this even means, i thought some pours are not connected to ground so i connected jumpers between them the ...
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2answers
377 views

PCB mount potentiometer rotation range of motion (start and end angle)

I am confused about the range of motion of a potentiomter with respect to its base (by base I mean the edge that lays flat on on the PCB when its mounted). Assuming that the mechanical travel is 300 ...
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129 views

OBDII Car-Hacking

Can I implement an OBD-II scanner using an ATMEGA328P in place of the ELM 327? Preferably read some diagnostics code and upload that data to a web app via mqtt using GSM module.
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98 views

Copper standard used for PCB manufacturing

Could someone help me with information associated to the type of copper standard which is used for PCBs (single layer & multiple layers)? And if possible share datasheets if available. Thank you ...
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1answer
81 views

Manually place a few vias in Altium

I placed a few vias manually. I get "Un-Routed Net Constraint." How can I fix that?