Questions tagged [pcb]
PCB is the acronym to Printed Circuit Board. A PCB is a carrier for the circuit's components and their electrical connections.
4,370
questions
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How should the correct cooling drawing be for the footprint on the d2pac case in kicad?
I have bta16 triac.(Package: d2pac)I want to do heatsink with pcb.Do you have a ready drawing? I want to examine.in kicad.I need to example layout.Thanks
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1answer
27 views
PCB photoresist method etching incomplete - only etched around borders of traces
I'm trying to make PCBs for the first time, but I hit a roadblock and don't know how to fix the problem. I etched my 3rd developing attempt, but it looks like only the border around the traces was ...
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2answers
68 views
How are PCBs with castellated pins arranged in a panel?
Can anyone please describe to me how PCBs with castellated pins are arranged in a panel. My understanding is that castellated pins are formed by drilling the edge of a PCB then plating, similar to a ...
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46 views
Will connecting two devices, one via an IC and the other directly, cause any revese flow in current causing malfunction in the working of the device
Sorry for the long and confusing question. I just genuinely do not know how to describe this issue. But I will try my best to explain below with a basic diagram
Basically, I have two microcontrollers, ...
2
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2answers
75 views
What is the most efficient way to invert digital signal? NPN, MOSFET, logic gate
I am designing a IoT PCB that will be powered with a Li-ion battery. I need to be really thoughtful about how much current will be drawn by the entire circuit, in order to increase battery life.
I've ...
6
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2answers
479 views
What do these two icons mean?
Left one - "no plumbum/lead"
Right one - "triangular invert color no picking by hand"
(found on BeagleBone Green)
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1answer
33 views
PCB height adjusting mounting
The PCB has a pulse oximeter mounted on the surface, and it's tolerance is 0.6mm. The problem is the pulse oximeter needs to touch the bottom case at all times. How to best mount the PCB in the case ...
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2answers
55 views
usage of ground terminal in push button
I want to add a reset button to the MCU in a PCB that I am trying to design. I came across some SMD buttons, but I wonder what is the difference between them?
One of them has a ground terminal. What ...
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1answer
34 views
How to bypass current sensor (ACS712) default 2.5V voltage output in buck/boost converter PCB
I'm having a bit of trouble coming up with the most practical fix for my buck/boost converter PCB. To give a bit of an overview, I'm using a current sensor to read the current value through an ...
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2answers
43 views
MC34063 Output Voltage Sagging
I am working on a project where I have used MC-34063 boost supply on 3 pcb's and all the 3 places I have the same issue ie
output voltage is steady on open circuit, but soon as ANY load is connected, ...
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20 views
Flex Signal Cable plug on Asus Rog Phone 2 [closed]
I broke the plug on the mainboard of my asus rog phone 2 that the flex signal cable connects to. I am not sure what type of plug I should buy to replace this.
I don't have a picture of the plug ...
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1answer
21 views
Power Switch for PCB in Proteus 7.7
I am trying to create a PCB that has ATmega16 using proteus.
I need to connect a power switch that cut the supply or power to the whole circuit, but the ATmega16's VCC pin hidden and directly ...
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23 views
Facing Problem In EasyEDA
I can't find the SMT type option in EasyEDA. Is it a new update or I messed up something? And what is a paste type? Please someone help me on getting the SMT type option back. There is no resource ...
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51 views
Decoupling on PCB - Filled Zones or Traces
Which of the two following PCB layouts for the given schematics (7805 voltage regulator) is better? Do filled zones affect filter/decoupling capacitors negatively?
Thanks!
Update: Second layer is a ...
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32 views
TinkerCAD schematic to Eagle for PCB design
I am new to the world of PCB design but I am having a hard time trying to convert my .brd file from TinkerCAD to Eagle. I've been following this tutorial for my conversion needs but it's almost ...
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2answers
208 views
Will replacing a 16.6nH inductor with 2 inductors in series total 16.6nH cause issues on RF board at 433MHz?
I have a circuit based on SYN480R.
It has an inductor 16.6nH(L1). It works well however it is hard to find 16.6nH inductors. I can find other values that I can put in series and sum 16.6nH. Will it ...
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12 views
How to convert Proteus NC drill file to Altium Designer?
I've read some articles about how to transfer the Proteus project into Altium project. When I followed their instructions, most steps are fine except when I wanted to generate a netlist from the CAM ...
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0answers
76 views
What is the squiggly trace on this power rail?
The image below is a D.C. power rail from an IDE ZIF connector inputting to various components (my crude diagram displays the connections).
...
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1answer
47 views
How to differentiate between Analog and Digital Pins in an STM32 MCU?
I am using an STM32F302C8 and while reading the datasheet I am unable to differentiate between analog and digital input pins I am on pages 34-42 of This datasheet.
I am porting over from Arduino Nano ...
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2answers
55 views
What is a comprehensive document from STM for PCB design using their STM32F302C8 MCU?
I have to design a STM32 based PCB and connect it to peripheral sensors that will communicate using 3 Analogue Pins and 5 digital.
I have found documents from STM on oscillator placement and EMC ...
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2answers
75 views
KiCAD: Weird ratsnest
I am in the process of hooking up the ratsnest in pcbNew, in KiCAD.
I finished with the process, except the last connection.
Here it is:
The upper copper layer is set to Vdd. As you can see, the ...
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1answer
81 views
4 Layer PCB Local Pours on Signal Layers
I'm in the middle of placing components on my first 4-Layer PCB. Layers are Sig-GND-Vcc-Sig. I2C/SPI/UART, up to 20MHz MCU, nothing exceptionally fancy.
I have decided to check with the community ...
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3answers
90 views
4 Layer PCB Standard Stackup Grounding
I'm about to start placing components on my very first 4-Layer PCB (wrapping up schematic and MCU software tested on 2-layer pre-prototype, all runs surprisingly ok, but still 2 layer meh). I've ...
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1answer
47 views
PCB pancake slip ring brushes [closed]
I am designing a mechanical attitude indicator for the avionics simulator. I need a pancake slip ring, that drives servo (max 500mA at 5V) and some backlight.
My idea is to use a gold-plated PCB and ...
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1answer
70 views
How to legally sell custom PCB, certifications etc?
I design a custom PCB, I use only RoHS components and RoHS PCB manufacturing.
Is that enough or not to sell my electronics in Europe legally?
I have read somewhere about certifications for any device ...
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2answers
41 views
Is it possible to attach extra text labels to components in Altium PCB?
I recently migrated from old Orcad to Altium, and so I often run into things that work differently.
One of these things is adding extra text labels to a component in the pcb editor.
A good example is ...
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1answer
35 views
what is the pitch for vssop-8?
I recently took on a personal project that requires a vssop-8 chip:ADC081C021. In order to help me solder the pins on the pcb, I ordered a vssop-8 stencil online. But when it arrived, I found the ...
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1answer
42 views
How much should be the trace width on PCB for max. 15A from 3 Phase AC Source?
I have source 400V 50Hz 3 Phase. Each line is 230VAC and maximum current passing by is 10A. This source is connected two motors and one AC/DC converter (24V out) and it is connected to control circuit....
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1answer
49 views
Can I use higher rated capacitor and larger package (for capacitors, resistors, etc?)
I am trying to design a "custom" design for ESP32 based on the ESP32-pico-kit_v4.1_20180314_en.
Schematic: ESP32-Pico-kit V4.1
BOM:
Why do capacitors C2,C4 and C15 have the same capacitance ...
0
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1answer
67 views
Why aren't magnetic substrates so used for RF printed circuits?
I've recently started working in microwave field, so I don't have big knowledge except for basic theory.
What I've noticed is that, in rf and microwaves printed circuits (for instance for microstrip ...
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2answers
122 views
What happens if I don't tin my DIY self-etched PCB traces?
Once I etch my PCB from copper-clad FR4, do I need to tin the board with solder?
If I do not tin the traces, what are the possible issues besides greening over time?
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37 views
Is it possible to create Altium PCB footprints without designator labels?
I'm pretty new to Altium, have years of experience with Orcad.
At the moment I'm in the process of filling a PCB library. Among them there are no-BOM footprints like test points, mounting holes and ...
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2answers
54 views
4 layer stackup, inner layers GND & PWR
To "somewhat" quote Rick Hartley, "the energy isn't in the traces & planes but in between", I'm now wondering, when I use the following stackup:
Sig
GND
PWR
Sig
You would ...
0
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1answer
54 views
PCB Edge “via shield” (Faraday Cage) using Altium
I am trying to add a "via shield" to my PCB edges, which is also called a Faraday cage.
I am trying to add vias using Altium software, but the vias are added outside the PCB edge and not ...
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1answer
31 views
Convert ALTIUM file to Autodesk EAGLE: what is the most recent procedure?
I would like to convert following Altium file to EAGLE:
https://www.st.com/en/microcontrollers-microprocessors/stm32wlex.html#cad-resources
To do so I have opened the file in Altium and exported it to ...
5
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3answers
2k views
How can I deal with crossing wires when designing a PCB?
I'm finally dipping my toes into PCB design as I got around to finishing up my schematic for an upcoming project that I'm working on.
If it helps in finding a solution to my problem, this PCB will ...
0
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1answer
42 views
What's the component name/part number of a motherboard audio jack?
I've de-soldered a triple 3.5mm audio connector thing from a dead motherboard and would like to use it for a small project. However, I have no idea what it's called, there's no part number on it, and ...
2
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1answer
70 views
Nixie tube project
I just got into Nixie tube clocks. I researched and found all the resources for the project (datasheets, models for Eagle/Fusion 360, etc.)
I designed a schematic as well as the board. The parts cost ...
0
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1answer
41 views
Nxperia Transistor PCB mounting
I want to use the Nxperia BUK6213-30A transistor on my PCB board, but I noticed that only two pins can actually touch the PCB. The pin in the center is raised above the PCB and cannot be mounted. Is ...
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5answers
5k views
Why do some PCB designers put pull-up resistors on pins where there is already an internal pull-up?
I'm going to use a DP83848I Ethernet PHY chip and I have noticed that a lot of people put pull-up resistors on these pins:
LED_CFG
PWR_DOWN
MDC
RESET_N
Example:
Why?
According to the datasheet, ...
0
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1answer
41 views
How to add remote testpoints to non-multidrop RS422 without causing reflections?
I have a RS422 non-multidrop connection between two connectors on a PCB (CLK+/- and DATA+/-) clocked at 1MHz, and currently routed with adapted edge-coupled microstrips (120Ohm differential impedance)....
0
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1answer
30 views
Running Multiple 12V Sensors to RoboRIO
We run anywhere from 4-10 sensors from Banner Engineering (Photoelectric and RFID). They use 12V power and have a PNP output. Each sensor is 4 wires (12V, GND, NO, NC). Our goal is that we can run the ...
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2answers
59 views
Battery Protection IC (DW06D) burning LDO (MCP1700)
I badly need your help.
I have a PIR sensor setup. It works fine without the DW06D LiPo battery protection IC.
Yesterday I added the battery protection IC (instead of just bypassing it) since the ...
0
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1answer
43 views
Suppression of current in the ground plane
I’m designing an antenna with two polarisation. The stripline from the two polarisation are close in one layer therefore the isolation between the two pol is degraded because of some current flowing ...
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0answers
72 views
What tools can I use for PCB making at home?
I want to create my own PCBs for prototyping and hobby purposes. I have experimented with buying them in China, which is cheap but not very fast. No idea on the quality either, but for $5 for 5 boards,...
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73 views
Working principle of PCB
This PCB is to turn on and off an LED. The captive touchpad is to turn on and off the LED, and one side of this touchpad is connected to GND and the other side to Pin 2 of the IC. Pin 1 is connected ...
7
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1answer
178 views
What is this structure on an RF PCB?
I'm looking at a picture of an RF PCB meant to operate at a few GHz, and I'm having trouble understanding exactly what this is:
Obviously there are some transmission lines, and something that looks ...
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0answers
46 views
What are the wavy conductive tracks for? [duplicate]
Consider the following PCB.
I notice some motherboards have such wavy tracks. Are there any purposes?
Or it is there merely for artistic purposes?
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1answer
77 views
What is this diode and what is the use?
I came through this schematic for powering a 3g module (SIM800L).
What is this diode connected with the bypass capacitors? By googling 5.1V 500mW I came to conclusion that it is probably a Zener ...
0
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1answer
82 views
Why are my copper PCB solder pads oxidizing?
I work at a place that sells LED strip lights and we don't have an engineering team, so I am hoping that someone can help me figure out what is going on because I've tried everything and I haven't ...
