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.

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19 views

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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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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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, ...
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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 ...
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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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 ...
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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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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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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 ...
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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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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 ...
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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 ...
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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 ...
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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 ...
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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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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, ...
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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)....
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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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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 ...
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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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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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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 ...
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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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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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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 ...
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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 ...

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