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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Difference between two terminal blocks

When I design PCBs, I normally come across two specific types of terminal blocks. The images of those terminal blocks are given below. Amazon - REES52 30 Pcs 3.5mm Pitch 2 Pin PCB Mount Screw ...
kailash kumaravel's user avatar
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How to use an 8-bit parallel display with an ESP32-S3-MINI?

I've made a PCB with an ESP-32-S3-MINI connected to NHD-C12864B2Z-RN-FBW display with a built-in ST7565R controller. I've tried some libraries like U8g2 to run this display, but with no success. Pins ...
Fabian_Olczak's user avatar
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1 answer
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How to center two pads in Altium?

How to center two pads in Altium? I usually drag the component pads to perfectly center it but is there any better way to do this; any shortcut?
Monesh Rathod's user avatar
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3 answers
77 views

How to ensure the current passes through decoupling capacitor?

I am familiar with adding decoupling capacitors to protect input power pins of chips on PCBAs, as well as output power pins of voltage converters. Still, there is something I am not sure of. Below are ...
uz3il's user avatar
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3D Printer Hardware and Wiring Upgrade [closed]

New Member - First Time Posting Several months back I thought of a modification to my 3D printer. New motherboard, touchscreen, filament sensor, etc. I want to take the GUTS of the printer and place ...
weaponrascal's user avatar
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4 answers
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Adding a capacitor to the output of an op-amp can cause instability? (PCB trace capacitance)

In my amplifier design, I checked all the possible issue for finding the instability problem in my previous post: Transimpedance amplifier with OPA838 - oscillation - supply voltage , Transimpedance ...
Andromeda's user avatar
7 votes
2 answers
1k views

What is the purpose of exposed copper on certain traces on this PCB?

I recently took apart a DeWalt battery charger. What is the purpose of this particular arrangement of exposed copper on certain traces (mostly on the right side of the image)? These are wide, high-...
dpwilson's user avatar
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Configuration tool programming for custom controller unit [closed]

Recently I have been developing a control unit PCB meant to control hydraulics equipment (such as proportional valves, distributors, etc) to work in industrial trucks. So far I have designed a ...
Daniel Gil's user avatar
1 vote
1 answer
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PCB Impedance mismatch?

I created a very simple PCB, two layers for testing a OXCO. The overall circuit is as follows: Now, so far so good from the testing point, I got what I expected: A square wave signal with a maximum ...
Ken90's user avatar
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Adding a capacitor between positive and negative supply pin can cause stability issue in OpAmp circuit?

I have a transimpedance amplifier designed and when I apply +/- 2V to its supply pins it is oscillating, I noticed when I apply GND to V- supply pin, it does not oscillate, so I have a little bit ...
Andromeda's user avatar
1 vote
1 answer
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Altium Designer 24: directives on schematic, yet "No differential pairs in design" error when routing

I want to create an USB differential pair. I added the nets, name equally but changing P and N as the image shows: SCH to PCB has been updated. Project comparator is enabled. No differential pair ...
Gonzalo García's user avatar
2 votes
1 answer
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Does DNF (Do not fit) mean that I should remove the component?

I have two schematics. On the ethernet-page, I can see this cross. Question: Does that mean I should not use the resistor there, like leaving ETH_CLK unconnected, ...
euraad's user avatar
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I am not able to see trace attached to component while dragging component in Altium

While dragging the component in Altium, I cannot see a trace attached to the component. I checked all the settings, I even reset all settings but it is still not working. Can anyone help me? I want ...
Monesh Rathod's user avatar
1 vote
0 answers
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How to keep alive a usb power bank [closed]

I purchased these usb power banks: https://cpc.farnell.com/ansmann/1700-0133/powerbank-20000mah-pb212/dp/BT06933?st=pb212 I have found if I use this cable: https://www.amazon.co.uk/dp/B0828TFBCJ?psc=1&...
Andrew Simpson's user avatar
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In Altium (Version 24.1.2) how do you create global netlabels? [closed]

When I google this, it asks me to locate the "Scope" tab under "Properties" but there is none. Since Altium keeps moving around options to different menus how do I find this "...
Electrolyte's user avatar
1 vote
1 answer
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Differential pairs-length match- Altium designer- cross talk

I'm routing LVDS and I wonder how much gap should I consider in between different pairs to not have any cross talk issue? (frequency=1 GHz)
Andromeda's user avatar
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Altium designer-PCB design- Keep-out layer

I have a board and I want to reshape the board, I draw the keep out layer first as follows: Then when I reshape the PCB, I see a thick green line around the board, but I expect to see a pink line (...
Andromeda's user avatar
14 votes
2 answers
2k views

PCB Edge connector: nipples on each finger?

I am designing a footprint for a PCB edge connector. The datasheet shows in DETAIL 'A', some "nipples" at the end of each finger. I don't understand note 5 and I don't understand what these &...
nowox's user avatar
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2 votes
2 answers
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I have a Li-ion “battery container” and I need help identifying an IC

I have 2 of these battery containers. They house 2 batteries each and have 1 PCB. The IC I need help identifying is an SOT23-5 with marking R3JR with an underscore under all the letters the other PCB ...
Noirher's user avatar
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2 answers
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USB 3.0 SS lines issue

Can you route USB 3.0 SS lines to two PCB's but the USB controller is located on the second PCB? The PC host is connected to the first PCB over a usb c-c connection (center usb port in image). Then ...
Omar Kiyani's user avatar
1 vote
1 answer
66 views

What happens if there is an impedance mismatch on differential pairs? [closed]

What do we encounter if the impedance changes along the way? For example, what kind of problem can we encounter when one of the two complementary PCB's is 90 ohm and the other is 100 ohm? For example, ...
esat's user avatar
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1 vote
4 answers
277 views

Limit high current using LDO regulator [closed]

I need to heat up a nicrome wire using 4Amps to break an O-ring. I don't know exacly what is the size of the nicrome wire, so I cannot put a resistor in series, also I cannot dissipate all that heat. ...
Gonzalo García's user avatar
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Can I use SATA traces on PCB for USB 3.0?

Can I use SATA traces (SSD_RX+/- & SSD_TX+/-) on a PCB for USB 3.0 data transfer? I am designing a test system for PCBs. There are SATA lines and I think this 2 pairs can use for USB 3.0 data ...
esat's user avatar
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2 answers
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TX and RX of UART are not connected to the board [closed]

I am looking in a TP-Link router and found an UART port. While I could determine the Volt and Ground ports using a multimeter, I couldn't distinguish between the TX and RX ports (two pin on the right) ...
satisfyinteresting's user avatar
1 vote
1 answer
49 views

Gerber files sequence [closed]

I have the following Gerber files from the manufacturer for order confirmation. As I inspected them, I have inferred that the order of the copper layers from top to bottom are tl, l3, l2 and bl. But ...
Semih's user avatar
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2 answers
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In Altium, how do I create mounting holes for a through hole transistor? [closed]

I am starting to learn Altium and I don't know how to create a through hole footprint. How do I get started on this? https://www.mouser.com/ProductDetail/Diotec-Semiconductor/BC337-40?qs=...
Max Cycles's user avatar
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Power distribution PCB and Li-po batteries

I am hoping to work on a project over the summer and it requires a decent bit of current. I ended up going with two 7.4 V, 5400 mAh batteries and I was planning on running them in parallel. With this ...
msalaz03's user avatar
0 votes
1 answer
69 views

How to program an STM32 MCU on a custom PCB

I am designing a PCB using an STM32 MCU to control a motor. My main concern is being able to use STM32CUBE IDE or the Arduino IDE to program the board. I don't want to spend a lot of money on a JTAG ...
Cqllysto's user avatar
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Can someone tell me what this IC is?

I was Hoping someone smarter than me could help. I am looking for a replacement IC that blew up on a board. I was able to get a picture of the chip from another board to get the markings. The chip ...
Fishbone's user avatar
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1 answer
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Seeking USB-C Female PCB Connector for Razer Kraken X Headphones Adaptation [closed]

I’ve recently undertaken a project to adapt my Razer Kraken X USB headphones from a USB-A to a USB-C connection. Originally, these headphones featured a male USB-A cable designed for PC connection. I ...
L F's user avatar
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1 answer
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Relay PCB board review

I just finished two versions of PCB layout for a relay board and I wanted to ask for some feedback before I order them - so it doesn't end up like my first PCB, which didn't work because I rushed it. ...
k0cka's user avatar
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0 answers
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Routing power return path between battery holders on opposite edges of the PCB

What is the best way to route the current path between two battery holders on opposite edges of the board where the shortest, most direct path would cross clock generator or would be near a sensitive ...
try-catch-finally's user avatar
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0 answers
19 views

How to tune in the right DRC rule for BGA footprint - Altium CircuitMaker

According to JLCPCB, they write that their capability for the clearance between SMD pad and track is 0.2mm. 0.2mm is 7.87401575mil. If we look at a GBA processor with 0.8mm pitch. Due to the 0.2mm ...
euraad's user avatar
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0 votes
2 answers
62 views

How to calculate the power draw and current draw of a PCB

I have a PCB my team designed that is based on an Adafruit board (Feather M0 LoRa), makes use of several breakout boards (temp sensor, IMU, etc.), and has various other components such as LEDs, ...
bimmui's user avatar
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0 answers
31 views

Changing from Through hole to Surface mount component

I have a design that would require a flat backing of our pcb. We are attaching a flex pcb to the back of this board being designed. This caused me to move/change some components from another engineers ...
Wes Ellgass's user avatar
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1 answer
70 views

Digital Potentiometer Not Responding in Custom PWM Circuit with Arduino

I've designed a circuit to generate a smoothed PWM signal using an Arduino, which then undergoes attenuation, amplification via a non-inverting op-amp, and finally has an approximate offset of 0.9V ...
Sergio Piccione's user avatar
-1 votes
1 answer
85 views

Cheap PSU pcb - no output [closed]

I ordered this PSU kit from aliexpress and I can't get it to work. Any ideas what I should test? There is no doc on this thing. Edit: voltages at electrolytic caps
brunobhr's user avatar
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Will the below XTAL Layout causes radiated emission from board

I am debugging a 6 layer board for RE issue and the stackup is (S G G P+G G S).This is a 6 layer board. The microcontroller used is FS32K148UJT0VLQT and the XTAL circuit diagram is given below. The ...
Hari's user avatar
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0 answers
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EMI performances observed better for stripline routing with pth rather than stripline with blind via

The circuit is: A fast switching driver (Lvth buffer) is transmitting a signal to Leon processor receiver and it also has a series termination. Stackup: top(L1), gnd, sig1(inner lyr3), 2.5V plane, ...
Ankita Sinha's user avatar
1 vote
2 answers
75 views

4 layer stackup with space constraints

I am a student and this is my first time doing a PCB. I am wondering if it's more optimal to designate both ground planes with the same net, or have them as DGND, AGND, and use a net tie. I have a ...
amill's user avatar
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0 votes
1 answer
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How to see schematic error in Altium?

In the Altium PCB view, we can check this kind of error with ALT+Right Click Twice But in the Altium Schematic view, I am not able to do the same. Is there any other shortcut to this?
Monesh Rathod's user avatar
4 votes
3 answers
172 views

Can I solder a press-fit connector with large footprint holes?

For my project, I designed a PCB using press-fit connectors. However, due to the footprint error, the holes were larger than they should have been, and these PCBs are 8-layer high-speed PCBs. ...
esat's user avatar
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0 votes
0 answers
63 views

USB-C Pogo Pin Coupler Troubleshooting

I've been working on this project for a while now and have hit a bit of a wall. I've been designing a magnetic cable coupler for a automotive device (Comma3X). The device communicates with the car via ...
Gyrohammer's user avatar
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2 answers
53 views

Can I supply 3.3V to a 4V stepper motor?

I am making a stepper motor driver. The motor requires 4V but the STM32F103 chip I am using requires 3.3V. I am using a DC-DC buck converter to convert the 12V input. Can I supply the motor with a 3....
Lucas Jiang's user avatar
0 votes
2 answers
71 views

old YAZAKI PCB pins

I have a circuit board out of an old dozer that are not manufactured any more. I managed to have a new one printed up as my first PCB project and it works great but I soldered wires to the new board ...
Naipalm's user avatar
2 votes
1 answer
54 views

Where do I stop the thick traces?

I am working on making a speed variator which also lets you invert the rotation of a motor. I have run into a few issues however. I don't know where to end the thick traces in my PCB design. This is ...
Abdelkerim El Bani's user avatar
1 vote
0 answers
41 views

Should copper fill zones be included for every layer? [duplicate]

I am working on a PCB but don't understand if I need a fill zone for each layer. I have a via which uses a B.CU layer. Do I need a copper fill zone for this too or is the copper fill zone for F.CU ...
help_me_learn's user avatar
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1 answer
47 views

How to fill empty areas with copper fill on PCB?

I am trying to create a copper layer. How do I fix the empty zones that are not filled with copper?
help_me_learn's user avatar
2 votes
1 answer
116 views

How should I test an oscillator on a PCB?

How does one go about testing an oscillator that is designed on a PCB? I have worked with breadboards before, but never a PCB. On breadboards, I usually test a lead connected to an output. On a PCB ...
help_me_learn's user avatar
0 votes
0 answers
53 views

How can I route vias to components?

I am trying to route a capacitor to the base of a transistor but when I try to route a resistor terminal to a via, KiCad doesn't permit me to connect the resistor to the via terminal directly.
help_me_learn's user avatar

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