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.
-3
votes
3answers
99 views
PCB burned board repair advice needed
While I was using a voltage meter to test the output of the battery pin connectors, I accidentally touch both positive and negative terminal pins which resulted in burns on a PCB board.
I am hoping ...
0
votes
1answer
37 views
QRE1113 stopped working shortly after powering up
recently I made a prototype IR tracking board by referring SparkFun Line Sensor Breakout and here is pictures of the PCB.
(The three in the middle was not soldered because I want to see if they could ...
0
votes
1answer
60 views
Op- amp input stray capacitance?
I have been wokring on a circuit, where I am amplifying a signal to a high voltage(around 100V) with a frequency of 20kHz but with fast edges. `
The op-amp shown below is used as inverting amplfier ...
-1
votes
0answers
53 views
Can I recharge an SRAM's internal battery with only power pins? [migrated]
I was wondering if it was possible to recharge PCMCIA SRAM Card (with an internal rechargeable battery) using just the Vcc and Ground pins.
A little background info: A piece of medical equipment from ...
4
votes
2answers
55 views
What does Minimum Slot Aperature mean?
Exploring some fab houses and I came across this statement from https://www.viapart.com/PCB/Explain
"Minimum slot aperture
Mechanical drill 0.6mm The tolerance of groove aperture is±0.1mm"
Does ...
0
votes
1answer
35 views
Capacitive proximity sensing - pcb pad
Does capacitance of pcb's copper used in conjunction with capacitance proximity sensor (analog) rises or lowers when the obstacle get closer?
0
votes
0answers
29 views
Minimal hardware requirements ESP32 WROOM
I've had a very simple PCB designed to supply the ESP32 WROOM module with power using a voltage regulator that supplies it with 3.3V.
However, this does not seem to be enough to run the firmware ...
5
votes
3answers
892 views
Recommended PCB layout understanding - ADM2572 datasheet
I have problem with understanding and applying this recommended PCB layout to my design (image from datasheet, page 18):
This is isolated RS485 transceiver with integrated isolated high frequency DC-...
1
vote
1answer
60 views
pcb-4-pin passive crystal is soldered to a 2-pin crystal PCB package
I would like to know whether it is suitable (not harmful) to put a 4 pin passive crystal in a 2 pin footprint.
Thanks in advance.
I have a 2 pin footprint in my PCB board,however,I only have a 4 pin ...
0
votes
0answers
25 views
RF device connection issue
I have a surface acoustic wave based separator device built on piezoelectric (PZT) substrate and this is mounted on a PCB for the external connection as you can see from the picture.
When I was ...
0
votes
2answers
49 views
Isolating main power traces on backside of the PCB
I am currently making a build-in PSU for my own audio-effect-rack-thing.
The internal PSU consists of two print-transformers(THT), one for 6VAC and the second one for 9VAC. These are also pretty low ...
0
votes
0answers
24 views
Changing impedance of load [closed]
For this representation, why is there a change in the variation of the impedance when Zload = R2?
6
votes
1answer
73 views
Best layer stack strategy for a 6 layer PCB with mostly SMD components
I am doing a design in a 6 layer PCB where both sides are populated. 95% of the components are SMD. The design is not "High Frequency" in terms of signal speeds....the fastest thing here is a MCU with ...
-2
votes
0answers
40 views
Injection moulding machine wouldn't load floppy disc [closed]
I have an injection moulding machine (KM 150-620) with control unit MC3. All of sudden the floppy drive stopped working.
Error on screen says ...
2
votes
0answers
62 views
Orientation of “bipolar” capacitors on PCB
I've come across a video on a popular and well-respected electronics channel on Youtube where they say that even bipolar capacitors have a preferred orientation in a circuit that minimizes hum and ...
0
votes
0answers
13 views
Trouble importing .bxl file into Eagle
I am trying to use ultra librarian to take a .bxl file from analog devices and create a pcb with it using eagle. I follow the steps according to this
webpage, and am able to place the part in a ...
3
votes
1answer
53 views
Having different voltage potentials as power planes on the same inner layer of a PCB
I am working on a 6 layer job which placement of the given components in the rather limited area that I have to work with...is driving me a bit crazy.
I have no option but to have 2 different voltage ...
0
votes
0answers
60 views
PCB HDMI high speed routing suggestions on my layout
I would like to get suggestions from all the high speed PCB layout experts on my PCB design.
I have a board with HDMI transmitter IC whose output is going to HDMI switch IC. The switch IC also has ...
5
votes
1answer
111 views
Connecting top and bottom SMD component pads using via
I am working on a 2 layer board and the PCB will be a double sided job. Some components on the top layer will have exact mirrors on the bottom right under them. My question is, for SMD components, can ...
1
vote
0answers
20 views
Realizing a prototype filter in ADS or any other simulator
I'm trying to design a stub-filter, and I'm stuck on realizing the filter design using Richard's transformations and Kuroda identities.
I'm building a 5th order Chebyshev LP-filter for 2.6 GHz pass-...
0
votes
0answers
25 views
Need guidelines with creating chip module footprint [closed]
I am trying to design my own RF PCB using online pcb-editor Easyeda. My circuit uses RF module cc1101. I couldn't find matching PCB library for my module so I decided to create one myself. I basically ...
1
vote
2answers
50 views
Grid like footprint on kicad for RPM5-3 component
I'm developing a PCB in KiCAD which uses the RPM5-3 DC power module from Recom. (Link to datasheet)
I created my schematic symbol and now I'm creating the footprint according to the datasheet ...
0
votes
1answer
49 views
Repair lifted ground pad on power amp
I'm repairing a 250W bass power amp board and one of the problems is that the pads for two ground wires have lifted off the board. It looks like it has had something of a bodge repair done before and ...
3
votes
1answer
46 views
Adding SMA conectors to a device whose metal casing is connected to earth ground through at a single point
We are iterating a device whose metal chassis is internally connected to an ESD guard ring that is connected to the PCB signal ground through a 0Ohm resistor in a single point close to the power ...
1
vote
4answers
164 views
Soldering one PCB to another with 90 degrees angle
I want two PCB's to be soldered with each other in 90-degrees style.
I think that the base PCB should have a slot with the width equals to the top board thickness. The top board should have a flange ...
1
vote
1answer
55 views
How much can you bend a flex PCB?
Having never worked with flexible PCB's before I was wondering how much and how often it can be bend? I'm thinking of using a flex PCB inside a pet collar where it would have to fold in order to ...
0
votes
2answers
114 views
Steps to replace a 10k ohm pot with a 10 ohm pot
I was about to build an all-in-one board for a retropie computer inside a gameboy advance sp shell, when I found this board that already was made and shared by someone else. I have a different ...
0
votes
1answer
53 views
Can I bridge output IO's from an FPGA that is driving a clock source to drive longer tracks?
Scenario
I have a motherboard and a daughterboard that couple through two headers.
The motherboard has a 16x16 array of ultrasound speakers each with their own drivers, that works. I drive them ...
1
vote
1answer
149 views
How to add LED effects to PCBs? [closed]
I don't mean LEDs for indication, debugging, etc. I mean LED effects like on the MSI Z370 Motherboard, where entire sections of the board are illuminated by continuous strips of light. How is this ...
3
votes
0answers
69 views
How to distribuite high current in multilayer PCBs
I'm designing a 150Amp controlled rectifier and I'd like to know how to distribute the current using a multilayer design.
Currently, I have a 4 layer design containing:
Top Layer: 6oz, Vdc+ and Vdc-...
2
votes
2answers
105 views
How to achieve 100ohm impedance for HDMI differential pair on FR4?
I have a 6 layer FR4 PCB, and want to achieve 100ohm impedance on HDMI differential pairs. I am only using top and bottom layer for differential pairs, and following are my parameters:
Trace width= 3....
0
votes
0answers
83 views
Problem with PCB making
I have followed a process to make a PCB, whose link is given below. I have followed the every process as mentioned with correct proportion of chemicals. But, unfortunately, this didn't work (traces ...
0
votes
1answer
25 views
KiCad export board area only
I've created a board with an outline that was created on the edge cuts layer. I've selected 'Board area only' and I've deselected 'Print board edges'. When I try to plot the SVG file for the F.Cu ...
2
votes
1answer
110 views
PCB stackup ambigous percent number
In this stack-up what are those presented in right-side of picture?
update:
The person who respond from manufacturer told me that is "residual copper ratio". But I think she is misunderstood because ...
1
vote
2answers
67 views
Ground Plane on Top and Bottom layers in 4-layer PCBs
Is it a good idea to fill free space on Top and Bottom layers in a multilayer (4-layer or more) PCB?
I usually use external layers for signal routing and internal layers for power supplies and ground....
20
votes
2answers
3k views
What's the purpose of these copper coils with resistors inside them in A Yamaha RX-V396RDS amplifier?
This is an bit of an overly specific question, but I'm curious about the purpose of these coils inside a Yamaha RX-V396RDS amplifier and wondered if anyone could explain what they're for. They appear ...
1
vote
0answers
50 views
Laser Tag System Design Review
I have been working on a project to make my own laser tag gins and sensor vests.
I have completed the electrical side of my design but this is the first time I have designed something like this and ...
0
votes
3answers
68 views
How to calculate PCB track width on proteus?
The current in my circuit is 60A and voltage is 36V. How wide should the tracks on my PCB be?
2
votes
2answers
161 views
12V to 5V buck converter 3A PCB
I am creating my first 12V to 5V buck converter with the TI TPS56339. I've heard that the PCB layout is critical and before I send the PCB to production I wanted to get it reviewd. I tried my best to ...
0
votes
2answers
60 views
How are capacitor voltage ratings chosen
I'm reading a user document of a dev board. On page 12, there is an explanation of the power management subsystem. The board VBUS and VBAT lines have a decoupling cap rated at 6.3V, whereas the output ...
1
vote
0answers
58 views
Footprint panel is grayed on Altium Designer PCB
This is a project I imported from Eagle (not so bad by the way). I resolved all schematic compilation errors. But now I am facing some small issues in the PCB part:
On the properties panel when I ...
0
votes
1answer
44 views
how to make different grounding
yesterday when i ask about driving circuit, someone told me that it is a little use in optocoupler when i use the same ground everywhere. because so far (iam a green hand in electronic) i just connect ...
0
votes
0answers
17 views
Static noise on a TDA7492 Bluetooth sound amplifier board?
I have a KKmoon TDA7492 bluetooth sound amplifier board with an AUX interface (https://www.amazon.co.uk/gp/product/B075QZ19VJ/ref=ask_ql_qh_dp_hza). The issue I have is that whenever I connect ...
0
votes
0answers
76 views
adding an antenna to a toy PCB, where can I ground it? is the negative battery cable ok?
I want to replace the antenna on my toy quadcopter with a better one, to improve reception.
On toy quadcopters the antenna is just a simple wire soldered to the quadcopter circuit board (with no ...
0
votes
0answers
31 views
What resistance would I need?
I'm kinda new to PCB design, but here we go:
I've created a simple sub-pump water level monitor and it uses a constant 5V from a MOSFET. In the end, it's all monitored by a raspberry pi and I know if ...
1
vote
1answer
86 views
Would these traces cause a short?
I recently designed a circuit board, but now I'm looking and I believe that once the diode and capacitor are connected, they might be shorted. Thank you for your feedback.
0
votes
1answer
54 views
Circuit Failure How to fix it? [closed]
I'm sorry I am very specific here, I have a problem with the charger of my motorbike dashcam and I hope you can help me fixing it (see picture and video test with multimeter).
I really have no idea ...
0
votes
1answer
61 views
Does alcohol set off Liquid Contact Indicators?
I have a MacBook Pro PCB that has lots of yucky, gooey and sticky grime from a spill that thankfully didn't damage the board. I would like to clean thr PCB thoroughly, but I fear turning the liquid ...
0
votes
1answer
45 views
Passing usb data traces underneath of DCDC converter
RKZ0505D is a DCDC converter which has maximum 85kHz internal switching frequency. It is placed as large surface of it placed directly on PCB.
If USB data lines pass under plastic package of DCDC ...
0
votes
2answers
71 views
Stripboard with 2.0mm spacing
I have a rotary switch with 20 x 2 pins in a rectangular form, and I need to connect almost all pins, so I thought to buy a PCB board for that.
The problem is that the spacing between the pins is ...
