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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Which microcontroller or other part could be producing a beep sound?

I have a hand-vacuum-cleaner (small device) which produces intentional beep sound (because of charging) once in every 2 seconds. I want to remove that beep sound, but I can't locate it. (I don't have ...
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PCB manufacturer from the 1960's

I have an old ferrite memory core plane that has either an "M" or a "W" watermarked on the board and was curious which manufacturer made this board. "Memory 2006000" is ...
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PCB routing of parrallel capacitors with different values (Based on STM Nucleo64 dev board)

I have been recently trying to understand how the STM32 ICs should be routed on PCB, in particular parallel capacitors of different values for power design. I have come across various suggestion about ...
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Can’t seem to solder vertical plug mount USB C connector

I’m trying to re-mount a vertical style USB C connector, but I can’t seem to make a strong physical connection. After soldering, the connector comes off fairly easily. Upon closer inspection, there ...
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54 views

How badly is this damaged? [closed]

Last night I ran my loadbox from my guitar amp, and it start to smell badly. I may have overcharged the power out to the loadbox. I decided to open the box and look for any visual damage. I saw three ...
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42 views

On a PCB, can an antenna for 433MHz RF be “far” from the transceiver?

When I design PCBs I always try to keep antenna as close as possible to the transceiver. Now due to the design I need the transceiver schematic on the left side but the antenna on the right side of ...
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63 views

Can you use a gerber file and a pcb printer to make a stencil?

I need to solder a tiny 3mm by 5mm SMD. Thank fully my school has a reflow oven that can do the actual soldering part but I still need to acuratley get the solder paste on there. SO I was thinking of ...
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Help diagnosing a faulty Garmin GPS [closed]

I've been trying to diagnose and fix a Garmin Drive 61 that was refusing to start (no display at least). Given that it sees long periods of inactivity (last time we use it was close to 6month ago), I ...
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Newbie Question : How to program/burn the chips on a self-made PCB [duplicate]

I am in the middle of building my own PCB Board with different kind of MCUs (ESP32/8266, ARM Cortex, W5500) - Because each of these in a Dev Board are to big I want to just get the chips onto the ...
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60 views

Circumvent 433MHz antenna printed on PCB

I'm tinkering on a cheap chinaware alarm center which receives signals from its detectors on 433MHz. It is located inside a metal box which forms a faraday cage and apparently reduces the range too ...
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Why has the auto-router put my PCB traces on two different layers?

This is my first PCB design. I want to design the PCB layout of the following switched mode regulator: This is the resulting PCB layout in which I've placed my components and the auto-router function ...
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how to design the full bridge converter as PCB border by using EASYEDA? [closed]

I am new to design the border and I need to layout and draw the border of full-bridge converter ?
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29 views

IMU 10 DOF (D) dimension

I got the dimension of the 10 DOF IMU model D on the internet. I wonder what is the dimension from the left to the center of the hole of the header pin. Besides that, for this type of header pin, the ...
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110 views

Rate my first 2-layer board

I would like to hear some comments on my first 2-layer board. Specificaly if I should go with two grounds (one for 12 V, one for 5 V) or just one big ground plane. Another thing is the layout of the ...
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ESP32/ESP8266 external programmer two way design question

When I design a PCB that has a ESP32/ESP8266, I usually integrate a USB-UART bridge in the design as well. However, I am now working on a board that will likely have more than just a few copies. The ...
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Can you copy layouts in eagle?

Below is my schematic design and below that is my layout. My overall project is that same schematic but repeated five times.  The same Vin but 5 different and isolated vouts. I'd prefer to not re-do ...
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1answer
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Through-hole soldering issue [closed]

I had some hard time soldering new switches to my computer mouse, now it looks like I lost some solder pads, what shouild I do? Every other component of the PCB seems ok cuz I didnt touch it. Photos:
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How to attach wires on a keyboard controller PCB

I want to make a module with 3 momentary buttons that will be record the numbers of pushes on a pc. For this first i though about using an arduino but also I am trying to use a keyboard motherboard/ ...
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47 views

Cleaning a PCB w/ w/ Isopropyl Alcohol - What Type of Deionized Water Should I Use?

I read a post on this sub-stack from seven years ago, which detailed exactly what I need to do. I will be soldering some components on a laptop PCB, and I'll be using rosin flux. Therefore, I'll be ...
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49 views

Help! Why don't my connections show up on my pcb gerber files? But they show up on the Eagle layout?

Below is a screenshot of my Eagle pcb layout. and below that is a screenshot of my gerber file extracted from pcbway.com As you can see none of the connections show up but they do show up if I take ...
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1answer
38 views

Why place a “Polygon Pour Cutout” area in PCB?

This is a front end circuit for capture signal. The signal's highest frenquency is 20 MHz. Why place a "Polygon Pour Cutout" area in PCB?
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1answer
55 views

Migrating from USB 3.0 Micro B to Type B connector

The current design uses a Micro B connector for the USB 3.0 connectivity. Unfortunately, this connector is susceptible to mechanical stress if the PCB is not handle with care, which results in ripped ...
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1answer
32 views

What is the name of these connectors? (XBee Radio Module)

I'm migrating a design from an older through hole module, to a new module that has edge connectors. The dev kit has these nice spring loaded connectors on the carrier board where the module just pops ...
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1answer
74 views

Can USB 3.0 tracks be closer together than 5W if they're quite short?

I am currently laying out a space constrained PCB which contains some USB 3.0 Superspeed differential pairs. These USB signals are confined to the PCB, going from a Cypress CX3 chip to a USB 3.0 Hub ...
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2answers
41 views

5 Pins soldered from a USB 2.0 type A cable

I have just recived a new product and I want to replace the permanent USB cable that is soldered to the board with a shorter female end USB. The problem is that when I disassembled the item I saw that ...
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3answers
91 views

Connecting analog GND and power GND

I need to connect a power ground and an analog ground. The power ground is a SMPS output. The analog side consists of 8 opamps and their resistors and capacitors. What's the best way to connect these ...
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STM32F103VCT6 Custom board not working

I made a custom board using STM32F103VCT6 MCU as shown in the attached schematic below. I soldered all the components as per the schematic and powered it on. The board worked for sometime and stopped ...
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992 views

Can I connect 24V direct to optocoupler?

I would like to check sensor signal on MCU. Sensor signal is 24V. Therefore, i want to use optocoupler as an interface between MCU and sensor. NC1 is going to MCU pin. My question is if i can connect ...
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1answer
35 views

Would joining pads of a pi-filter eliminate impedance changes from line to pad? Would it cause problems with alignment during reflow?

This is a 2 part question: Would joining the pads, such as on the lower pi-filter pictured, cause any problems with alignment of the components during reflow soldering? Would joining the pads result ...
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24 views

Signal path / configuration help for a PLL for AWG

In our system signal path, there is a clock signal being sent from the FPGA noted as SCLK. This goes to each component not including the MCU. The way I understand this is that the PLL receives the ...
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72 views

What is the name of the translucent substance on the PCB?

PCB on photo is from the Kinesis Advantage keyboard. I need a similar substance to remount the PCB. What substance should I use?
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79 views

PCB 6-layer stackup problem

I'm currently designing a PCB with double side components and I'm limited to 6 layers max. The project has couple of MCUs at 84 MHz. There are USART, I2C, SPI, some analogue lines and high-power lines ...
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1answer
55 views

What is 'metal mask' here?

It's common to see 'solder mask' in PCB design. But sometimes, I see 'metal mask', such as in page 5 of this datasheet, does it mean I need to design a pad larger than the solder mask opening?
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60 views

What is a DC block and how can I put this on a PCB?

The circuit diagram that I am trying to replicate casually mentions a component called "DC block" but doesn't go into details. I believe this has something to do with RF filtering? Will I ...
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2answers
93 views

Can a similar crystal and not exactly the one on the datasheet be used on RF 433 receiver?

The datasheet of SYN531R suggests 13.51783 MHz crystal. I found available available 13.52127 MHz on an online store. It seems very similar to me, however in reality would it work and if yes, would it ...
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40 views

How can I fix 3D viewer problem on KiCAD?

I am designing a circuit on KiCAD. I added new components to footprint with 3D models. When I open 3D viewer in footprint editor, everything looks fine however when i use the component and open 3D ...
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1answer
64 views

Is it possible to solder a USB cable directly to a board?

I'm working on a design for a PCB carrier for Raspberry Pi Compute Module 4, and I need to connect by USB 3.0 a wire to this carrier board. Is it possible to solder it directly to the PCB in order to ...
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76 views

What does the hole size and diameter of a via means in Altium? What do they actually represent?

For my school project, I am designing a small PCB. For routing the signals I need to use a via. There will be around 500mA current flowing through the via. I am using 0.5mm traces to route the signals....
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85 views

Mechanical relay circuit schematic and PCB. What is wrong here?

I built a relay that closes when a GPIO gives a GND signal. I have tested the circuit with a breadboard and it works with the same components (except breadboard uses THD diode and PCB uses SMD), but ...
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382 views

How to program MCUs and test PCBs in mass production?

I am working on a PCB which includes an microcontroller (STM32), some sensors and a BLE module. Right now it is still a prototype, only 3 units have been produced. To program the microcontroller, I ...
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96 views

How to choose the correct transistor?

I am having trouble understanding the definitions for the transistor. I am checking many different transistors and unfortunately every company has different words/symbols. For example, in one company'...
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1answer
67 views

Where does this white dust come from? [closed]

I have a PCB from a humidifier which ceased to work. It could be water damage but I am not sure. I sm unsure if it is the transformer or some capacitor. Please advise if I can repair or if it is ...
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1answer
24 views

Altium: Component Clearance constraint won't go away after setting rule

I am using Altium 18. I ran a DRC check and got the following error: This is saying i don't have clearance between J2 and MH2. This can be seen in the PCB: However, i have set the following rule: ...
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1answer
22 views

Altium Placing components

I am trying to place components in Altium designer using the Manufacturer part search but the "Place" option is inactive. .
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1answer
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What to do with the /RST pin?

I'm using this gate driver IC. My question is, do I have to externally pull up the /RST pin? Because it can't be left floating, but I don't get the part that says "pulled down internally". ...
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1answer
37 views

PCB GNSS module with RPi

I am trying to get a GNSS module to communicate with a raspberry pi serially. I was attempting to set this up with an ESP module but I don't think it will work, or at least I am missing something. In ...
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5answers
132 views

Diy slider potentiometer?

Hi I need to use a 25cm (10inch) long slider potentiometer for my project. I can't find them anywhere so I'm thinking of getting a PCB made and putting some resistive material on it. My PCB ...
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1answer
131 views

5V to 3.3V what is wrong on my schematic?

I made a schematic based on the SY8089A1AAC(Datasheet) My schematic(I tried with and without C8): I soldered everything but the output is 0V(0.04V to be precise) What is so wrong ? It is part of a ...
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1answer
44 views

Can't get pins on molex micro-fit 3.0 connector

I have this molex connector: https://www.digikey.com/en/products/detail/molex/0430251800/531407 and these pins: https://www.amazon.com/gp/product/B072KTD2ZJ/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&...
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2answers
25 views

How to select all components on Top layer in Altium PCB?

How can I select all components on Top layer of a multi-layer PCB in Altium without selecting the route traces? And is there any way to select all components on both Top and Bottom layers together?

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