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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21 views

What should I use to filter noise from 5V power supply with multiple consumers

I want to create a PCB board that would have: input - 5V wall outlet USB charger or for example MeanWell Din power supply output - 3 usb ports that would be used by RPI-like devices. (5V 2A max each)...
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22 views

ft24c02a EEPROM Raspberry Pi I2C issues reading

I have a digital scale that I am trying to take apart and feed the weight into a raspberry Pi. The digital scale has a FT24C02A EEPROM that is I2C enabled. I am guessing that the weight is calculated ...
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2answers
40 views

Old monitor’s internal power supply works only when heated from the outside…fixable?

I have this old LG Flatron w1934s that worked fine until it‘s power indicator led started flashing, and after a long while the monitor turned then on, if I heated the monitor’s back with something ...
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11 views

LG K40 fingerprint sensor repurpose

I am attempting to repurpose a slim LG K40 fingerprint sensor for a diy project. I am looking for a small breakout board that connects to it, so I may connect wires to the small pins. It is a 10 pin ...
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22 views

Need to measure RLC values on PCB

I need to measure R, L, C values which are assembled on the PCB. I know that the PCB's capacitance, resistance, and inductance are having effects on the assembled components. Can somebody provide any ...
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1answer
27 views

Via Tenting/Plugging

I am trying to create the best PCB possible for my DC Motor controller. I have been looking into the different ways to make my vias for my PCB and I am a little confused on the topic of tenting and ...
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59 views

Microcontroller Oscillator Layout for ESD immunity

I have a small portable USB device failing ESD immunity. It's a two layer board with a solid ground plane on the bottom. I have diode protected inputs, and there's a TVS on the USB connector, and I'm ...
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57 views

How much RF power can a microstrip line handle?

Transmission lines on printed circuit boards must be impedance controlled lines since we want to transmit the full power and avoid the reflections. Microstrip lines have three parameters that we can ...
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2answers
84 views

What causes a USB Cable to fry a PCB?

When assembling my own USB 2.0 spec cables, I haven't had any experience with frying PCBs they get plugged into (of custom-made keyboards primarily), but I hear stories of it happening. So I'm trying ...
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40 views

How to identify the serial console port pads on device

I want to identify the serial console port pads on the board. The place for male header connector(yellow arrow) have 6 pads. Usually it’s not difficult to identify Rx, Tx, GND pins with a multimeter, ...
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53 views

How will i design my Motor Circuit

I will be designing a circuit for 8 stepper motors. these stepper motors require 12V and atleast 3A. at most only 2 stepper motors will move at the same time. Will a 12V 30A bus be enough or ...
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48 views

open source SATA to DDR2 SDRAM adater

I want to learn how computer memory sticks can be used as secondary storage using some intermediate FPGA for data processing. Actually I want to design a PCB myself. I'm good with PCB designing but I ...
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39 views

How do I change the dimensions of a PCB in Altium Designer 19.1 using by entering the value I want the dimension to be?

How do I change the dimensions of a PCB in Altium Designer 19.1 using by entering the value I want the dimension to be? Please for the love of 555 DO NOT tell me how to edit the size using the mouse ...
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1answer
853 views

Avoiding microstrip line to become CPWG

I have been designing RF PCBs for a year for an RF front-end system. One of my PCBs has very strict constraints about its size measurements. So, I should design it very densely. The problem with ...
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1answer
53 views

What's the best way to fix this missing solder pad?

During a repair of a mixer, I had to desolder the XLR output jacks in order to remove the front panel. When I started to resolder them I noticed that an pad (or eyelet? not sure of the difference) is ...
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70 views

Cost of assembling components in different packages

I was wondering different packages are usually handled. Specifically, the SMD packages. Are there any benefits to having all components in a single package? For example, I have all of my resistors ...
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3answers
86 views

How to connect wires coming from bottom side of a single-layer PCB?

I intend to use an IMS PCB, that is a PCB with aluminium substrate. It will be a single layer PCB (because of the cost, and heat), so only the top layer. I need to connect approx. 20 wires to the top ...
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1answer
31 views

Connecting a polygon to a smd pad (Eagle)

I am attempting to create a polygon that increases the area of an existing smd pad so as to make the area larger in order to hand solder. I am running into an issue removing what I believe is the ...
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23 views

Altium Designer component designators disapeared in PCB editor

I was editing my PCB in Altium when all the values of all the component designators disappeared. None of the components have any titles or values they're just red block with pads. How do I make the ...
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3answers
81 views

What probe/tip to use to clip into a PCB test point?

I need to have a digital logic analyser connected to a test point of a PCB board I'm developing for. To be clear, I mean the little ~0.5mm hole kind of test points. What kind of probe would allow me ...
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36 views

How to decode front end circuit of Red Pitaya STEMlab 125-10 board? [duplicate]

I need to decode the amplifier part and filter circuitry of the Red Pitaya STEMlab 125-10 board. I took these closeup images and I have an actual board. I have got the chips being used on the board ...
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24 views

Single schematic split to multiple PCB in Altium?

I'm wondering if it is possible to have a single schematic that can create multiple PCBs. I'm aware of the multi board capability, however this seems to use multiple schematics to create the ...
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1answer
48 views

Need help identifying cable in old boombox

I'm planning to replace the radio part of my old boombox with a 3.5mm jack so I can connect my phone. The cable that leads from the main pcb to the radio pcb has four lines, labeled L, G, R and +B. I ...
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33 views

Using an unknown CLK output to pulse two LEDs [closed]

I am trying to modify a preexisting imaging setup. The setup I have relies on an excitation LED to excite a fluorescing material which will then be captured on a camera. The already existing setup has ...
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47 views

Resistive heating cuircuit design

I am designing a small (10mm^2) resistive-based heater. I wish to heat a ceramic surface to about 250°C, via some high frequency AC-current. My aim to is have some sort of high-temperature PCB printed ...
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2answers
102 views

What is this white stuff on the solder of this PCB?

These photos were taken from a new-in-box 16kB memory expander for a Timex Sinclair 1000 computer. As far as I'm aware, it was never used. The box was made of thin cardboard with a two part styrofoam ...
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76 views

Are all the DIP-16 packages the same for PCB library design?

I am designing PCB library for a component whose Package is DIP-16. I have already footprint of this Package in other components. Can I use them interchangeably in the new component in terms of their ...
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2answers
92 views

What Gerber File Viewer is This?

PCBWay sent me this image while trying to troubleshoot my circuit board file content not showing up. I want to know if this program is available so I can download/buy it to troubleshoot my output ...
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2answers
35 views

Incidence of vias in the middle of a net [closed]

Talking only about power and not interferences or inductance/capacitance, and taking note that all copper loosed by the hole is gained by the cilinder inside it, what is the incidence of vias in the ...
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18 views

how to import mentor pcb file into Altium Designer

I have one PCB file downloaded from the Internet. I want to use the PCB file on Altium. As the Schematic file is DSN, I think this PCB is a Mentor PCB file. File Extension is *.pcb. I tried to import ...
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1answer
81 views

PCB markings - What components might have component designators TB1, TB2 etc?

Looking at a PCB, there are 4 components marked TB1, TB2 etc. I believe that the markings mean terminal board. What exactly is a terminal board? Update: Unfortunately I cannot show a picture of the ...
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4answers
94 views

PCB Pressure copper connectors design

in a project that I am developing, I have a plastic cube with metal contacts, like this: The cube is 2cm x 2cm x 2cm. The metal contacts are nails with ~2.5mm diameter. The center metal contacts (5 ...
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62 views

Red Pitaya amplifier part schematic

I am trying to replicate the front end design of Red Pitaya Stem 125-10. They haven't provided the complete schematic part. Has anyone tried to decode the rest of the schematic part?
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2answers
505 views

Is there any connector for SMD components

I want to fine-tune the resonance of multiple LC-circuits with hand made inductors(coils), and SMD capacitors (NP0 type). Currently, I am tuning the resonance frequency by soldering and desoldering ...
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2answers
49 views

Aligning PCBA on a plastic enclosure

I am trying to align a PCBA very accurately (within +/- 0.5mm positional tolerance) on a plastic enclosure. I'm thinking about using two 2mm diameter dowel pin that is press-fitted into the plastic ...
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1answer
30 views

Relation ship between Track width, Impedance, Dielectric and copper thickness

I like to know the relationship between different factors like track width, impedance, dielectric and copper thickness. After quite a reading I got to know that as the track width of a cline is ...
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1answer
69 views

Which side of this board is the capacitor polarity indicating?

In this capacitor slot, which side is the negative and which is the positive? I've never seen this symbol before. I'm assuming the bottom is positive but want to make sure. Thanks!
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3answers
2k views

How would an alarm button work in a bathroom scale?

I am given a bathroom scale that I have to reverse engineer and beneath the bathroom scale, there is a button that sets an alarm for 24 hours from when you pressed it so that it can remind you the ...
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2answers
67 views

How to reduce EMI susceptibility for board to board connectors?

I am planing to design an MCU based board. Although I don't need all the GPIO's, SPI's, PWM pins, etc. I like many of them to be connected a card edge connector or board-to-board connector. So, I can ...
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2answers
55 views

Chip antenna and PCB StackUp

I'm working on a ISM (868Mhz) weather station for my home and i'm trying to implement a Ceramic antenna directly on PCB. After reading the guidelines, i have questions again. One of then is what ...
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1answer
32 views

Lumped model not applying to PCBs

Recently I have heard that KCL and KVL do not fully apply when performing electrical measurement on PCB traces. It was implied that PCBs are not completely lumped circuits - that is, we cannot assume ...
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2answers
656 views

Help identify missing component USB power

Can anyone help identify the component that is missing from this circuit board? The board is the main controller board for a music keyboard. The keyboard is meant to be able to be powered over USB but ...
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8answers
3k views

Is it safe to rub WD-40 in to a brass insert on a circuit board?

I am trying to replace the SSD on a laptop. After a Loctite nightmare that I had while getting the casing off, there's just one last screw between me and getting the job done. Despite being confident ...
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1answer
25 views

Altium Design, can't change track width

I have hit 3 while tracing, I have hit shift w to open my favorites and it shows me favorites, but for some reason the program will not change the width of traces. It is stuck at 10mil. Anyone know ...
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44 views

Does through-hole mounting have an advantage over surface mounting in sub-zero temperatures?

I am working on a device that I want to work outdoors far up north (e.g. on a farm), maybe down to -40C. I read a lot about through-hole circuit boards being more resistant to environmental stress ...
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1answer
47 views

PCIE Trace Length Matching Between Tx, Rx, and Clock

Looking at laying out a PCB that will utilize PCIE. I've read that you want to keep intra-pair trace length to 5mils max and that inter-pair trace length matching is not terribly important. The ...
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1answer
93 views

How to draw/include ESD susceptibility symbol on my designs?

I am using Allegro 16.6V. I want to draw/include ESD susceptibility, non-recyclable and recyclable symbols on my design. How can I do this?
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25 views

RFID/NFC transponder with current delivered via wire

I'm sure everybody here knows how RFID transponder works, reflecting radio waves and receiving them at the source. I'm looking for the same concept, but instead of the input to the transponder being ...
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6answers
4k views

I'm TV technician, but I don’t know how to save or protect the boards in my workshop

I have main boards, power supplies, and so on as spare parts. But sometimes they spend several years in my workshop waiting for a customer. When I find the right customer, several times the boards ...
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8 views

bt800 component. Need som help understanding how to send commands

Datasheet << The bluetooth module im using. Im planning on using this bluetooth module on my project. Im 99% sure how to do it but as im designing it for being mounted on a PCB so i want to be ...

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