All Questions
Tagged with schematics pcb-design
202 questions
0
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24
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How to power and dim 3S10P LEDs from a USB-C using MT3608 and AL8860 for flicker-free operation?
I'm a electrical newbie. I’m working on a project where I need to power and dim a set of LEDs from a USB-C power bank (5 V, 3 A max). My LED configuration is 3 LEDs in series per string (3S) and 10 ...
-1
votes
1
answer
60
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Can I replace the big crystal oscillator with a smaller oscillator (in size) in MCP2515?
Am using the 'MCP2515 Can Bus Module Board with TJA1050' as a reference in my custom PCB, what I was wondering is that if I can replace the big crystal this board has (look at the image below)
I have ...
- 125
0
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0
answers
39
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What is the total capacitance on the VBUS line in this case?
I am working on a PCB that is supposed to be powered either by an USB Type-C or by a 3 cell LiPo battery, so in this scope I decided to use the TPS2121 power mux. The problem is I don't understand how ...
- 197
1
vote
1
answer
71
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Is this a good design for having 2 power inputs for a PCB?
I’m designing a PCB powered by a 3-cell LiPo battery. The battery provides +12V, which is stepped down to +5V using a buck converter. From there, the +5V is further stepped down to +3.3V using an LDO ...
- 197
0
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0
answers
64
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Custom ESP32-S3 PCB not connecting to PC
I am new to electronics and PCB design and am trying to make a little sensor hub thing based on the ESP32-S3 using the SeeedStudio XIAO Round Display via pin headers.
I have designed the following ...
- 1
1
vote
0
answers
79
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PCB Beginner Schematic Check [closed]
new to PCB design and wanted to learn by doing. I have linked a schematic to a project I am working on. This is a single piece of a larger project which will hopefully work nicely together but wanted ...
- 21
0
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0
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56
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Review PCB - Lamp and Motors - Round 2
This is a follow-up to this post.
I incorporated the feedback and decided to add a custom DC to DC converter (12V to 3V3). Also I designed the PCB from the schematic.
Traces are 0.3mm by deafult, ...
- 149
0
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1
answer
60
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Errors and Warnings from the Electrical rule checker in KiCad for my schematic project
For a project in my studies, I need to design a schematic for a PCB. I've already created the following schematic, which you can see in the attached image. However, I’m still getting one error and ...
- 3
-1
votes
1
answer
60
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Issue with PCB Document Update in Altium Designer
In Altium Designer, when I perform an "Update PCB Document," I receive the following message:
"Failed to Match 1 of 277 components using Unique Identifiers. Do you want to try and match ...
- 941
0
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1
answer
104
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How to prevent loop in auto-switching charger using MH-CD42 and LTC4412?
I'm making UPS-like power supply using MH-CD42 lithium-ion Battery with 5V boost charging module and LTC4412 power or-ing IC chip.
I made my schematic based on the picture on google like the pictures ...
1
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0
answers
84
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Altium PCB error - Comma expected at line
I am getting this popup
every time I open the PCB file of my Altium project.
There is a similar question here Link: Altium Comma expected , and I tried the things suggested in the comments of it.
...
- 11
0
votes
2
answers
106
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PCB Design Review Request - Boost Converter Breakout Board
I recently decided I wanted to design a breakout board for the MIC2253-06YML-TR (datasheet), though an evaluation board exists for it I will need this chip for an ongoing project I will be working on ...
- 31
9
votes
6
answers
1k
views
Not confident about going for PCB production [closed]
I have come up with my own PCB and I now want to go for production. Though I will order very few boards in the first order, it costs me decent amount of money to get a fully assembled PCB. This PCB is ...
- 125
0
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0
answers
37
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Is this a good schematic for the W25Q128JVSIM flash memory?
I'm designing a PCB and need additional flash memory for the firmware, so I've chosen the W25Q128JVSIM flash memory(datasheet) and plan to use standard SPI. I've connected both the IO2 (/WP) and IO3 (/...
- 197
3
votes
0
answers
90
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Do you see anything wrong with my power circuit?
As the battery input I am using a Turnigy Nano-Tech 2200mAh 3S 25C Lipo Pack w/XT60 that fully charged is able to provide 12.6V. The ferrite bead FB1(2744555576 from fair-rite) is supposed to act as a ...
- 197
-1
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1
answer
77
views
Where is the Cf cap in this design?
I am using WEBENCH from TI for the LM2596SX-5.0/NOPB buck converter. It is a Cf cap in the "BILL OF MATERIALS" that doesn't appear on the schematic. Do you know where is that from?
- 197
0
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1
answer
103
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Do you see anything wrong with the power section in my schematic?
I am new to electrical engineering and I would be very grateful if someone could look over my schematic and tell me if something is wrong or could be done better. In my schematic I have a XT60-M ...
- 197
0
votes
2
answers
107
views
Help reading schematics for design reviews [closed]
I'm reaching out to those with more experience in reading electronic schematics. As the Compliance engineer on the team, I primarily handle testing, pre-testing, and certifications. Recently, I've ...
- 554
1
vote
1
answer
73
views
Circuit schema 2 ways WS2812 connect with 1 PCB layout
Hey all I am having a difficut time trying to figure out how to go about the following:
I am wanting to just make 1 pcb but I am using WS2812B LEDs and therefore needs to be in the correct direction.
...
- 805
0
votes
1
answer
141
views
LSM303AGR burnt, help find the schematic error
I am just testing the board, it was working fine but after some 3-4 hours, I noticed the 3V3 had shorted to GND, I was measuring 0.5V on the power source. I inspected with a thermal camera and the ...
2
votes
1
answer
109
views
FT230X using USB-C receptacle not working for data transfer
I have tried to add a USB-C connection to my PCBA solely for data transfer.
I have used a FT230XQ-R microchip (Datasheet) and followed their uploaded example for a USB-C receptacle. I have now ...
- 43
0
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0
answers
75
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Outdoor LED power PCB schematic review
Could someone look over my schematic and let me know if I need to change anything or if everything looks good? This PCB will be used outside (inside a waterproof cover) and will power a few LED strips ...
- 805
0
votes
0
answers
73
views
The simulation in DipTrace 5
I have created a schematic, see attached screenshot. Now I am trying to simulate how it works in digital Spice simulator (built in DipTrace 5.0 beta).
digital Spice simulator (built in DipTrace 5.0 ...
0
votes
1
answer
169
views
ESP32 Schematic review, can't flash using U0TXD U0RXD
Hello 👋🏼
I'm reaching for help, i tried debugging the issue with my current knowledge but to no avail...
I have created a ESP32-D0WD-V3 based board, It's pretty basic and cover what i need in a ...
0
votes
0
answers
60
views
Arduino circuit design help
Below is my current design for an Arduino project that contains a proximity limit switch and a relay to toggle on/off a small 12volt heater. All other components are very straightforward and are ...
4
votes
1
answer
652
views
Is a diode really necessary when exposing USB VBUS as a pin on a dev board?
Hobbyist dev boards are typically powered by USB and the GND and VBUS pins of the USB connector are usually broken out as pins on the board (so, that one can power additional devices connected to ...
- 675
2
votes
1
answer
834
views
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, ...
- 1,388
1
vote
1
answer
186
views
Raspberry PI CM4 carrier board with Altium : multiple footprint?
I'm currently designing a carrier board for the Raspberry Pi CM4 that physically includes:
1 Compute Module
2 DF40HC connectors
4 Steel standoffs
I've encountered a dilemma in generating assembly ...
- 849
0
votes
1
answer
200
views
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?
- 143
0
votes
0
answers
47
views
Same hierarchical block for different power supplies in Altium Designer
I need to repeat one circuit in my design but connecting it to different power supplies. Because it is a repetition (iteration) I have decided to use a hierarchical block and copy it 3 times. The ...
1
vote
1
answer
80
views
Altium - Back Annotating (PCB -> Schematic)
I have a project that was converted from PCAD to Altium. The PCB layout looks great in terms of component placement, tracks, polygons, etc. A colleague went through and created a bunch of schematic ...
- 180
0
votes
1
answer
123
views
Are LSE and HSE a must when designing a PCB with an STM32F103C8T6?
I was designing PCBs with STM32 blue pill, but I need to design without blue pill, so I will need an STM32F103C8T6.
Do I need both resonators?
I read that one of them is for LSE and the other is HSE ...
- 1
0
votes
1
answer
156
views
Trying to get 5 V using MT3608 (step-up boost) but without success
I designed a circuit to generate 5 V using a 3.7 V battery and an MT3608. The main problem is that I can't get 5 V but just 3.5-3.9 V, even after changing resistors.
I tried everything:
Changing R1 ...
- 3
0
votes
2
answers
109
views
Do non-polarized capacitors need to be in any type of orientation?
I have submitted my PCB design to JLCPCB for population. They are asking me if the orientation of my capacitors are correct:
My PCB and schematic of it:
In the datasheet it states that these are non-...
- 805
0
votes
0
answers
73
views
ESP32 custom board review
I have just finished the electronic design of my project and would like to request a review from anyone with more experience in PCB design. It's a custom development 2-layer board based on the ESP32-...
0
votes
2
answers
1k
views
USB pin connection in ESP32 PCB schematic
I want to know about the VBUS pin connection of the USB connector. I have an ESP32-S3-DevKitM-1 board.
https://docs.espressif.com/projects/esp-idf/en/latest/esp32s3/hw-reference/esp32s3/user-guide-...
- 173
3
votes
1
answer
323
views
What are some best practices for library management for schematic and PCB design?
Most CAD packages use a "symbol" and "footprint" library approach when it comes to designing schematics and PCBs. Some (like recent versions of Altium) have "component" ...
- 572
1
vote
1
answer
1k
views
What are these double arrows on a schematic?
If I have to reproduce this schematic in KiCad, what should I use?
How do I represent Vin+ in KiCad? Is this a local or global label?
- 15
0
votes
1
answer
139
views
ESP32-C3 RF pin design question
I have a question regarding the ESP32-C3.
I would like to have a transmission and receiver antenna in my system. The transmission antenna needs to be close to isotropic and the receiver must be very ...
- 554
3
votes
1
answer
906
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What is the purpose of Solder Bridge?
I am learning about STM32 controller now.
While learning I gone through the datasheet of STM32F429 display board in that board it has solder bridge.
I don't know what is the purpose of that. Can ...
- 71
0
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1
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70
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Please check if there's anything wrong with my 555 PWM schematic
My first time creating an EAGLE CAD schematic. I want to turn this into a PCB.
I want to ask if there's anything wrong with my schematic, like the wiring or the efficiency or something like that.
- 21
6
votes
1
answer
421
views
Can I use Sparkfun Schematic/Layout in my design?
I am currently working on my thesis project (PCB designing) where I want to use some components on my PCB such as antenna and ublox NEO D9S chip. There is a company called Sparkfun, who makes PCBs ...
- 99
1
vote
1
answer
50
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What am I supposed to do with the Backplanes for the PCA85276?
I am trying to use eight 14-segment display with this driver but I can't figure out what the backplanes would be for and what I should connect them to. It gives me this table with the possible ...
- 15
0
votes
0
answers
89
views
Help with TP2825
I want to create a DVR based on the PB1126 chip using the TP2825 encoder. This encoder performs very well the auto-detection of cameras CVBS, AHD, etc.
On the Internet, I did not find information on ...
1
vote
2
answers
467
views
Please review my schematic
I wanted to know if my schematic looks correct.
I am unsure if I have connected VCC and GND correctly with the capacitor.
- 21
1
vote
2
answers
231
views
Altium Variants In Bill Of Materials
Is there any way in Altium to display/combine the different Variant configurations in a single Excel sheet exported from the Bill of Materials, e.g. have the different variant configurations displayed ...
- 106
1
vote
0
answers
74
views
Flexible PCB design suggestion
I'm currently learning to design a PCB. For this board, I want to sense the current in two different ways (using either analog or digital current sensors). Each sensor requires a current sense ...
- 99
1
vote
0
answers
250
views
Use of global power label in a KiCad schematic
I am using a DC-DC buck converter to convert 12V DC to 3.6 V DC. The screw terminals J1 are the battery inputs. The other side is the output.
How do I facilitate the power supply to other components ...
0
votes
2
answers
199
views
Schematic review request - steering wheel
I'm in the process of designing and ordering my first PCB with MCU. In the past I did make PCBs that were driven by a Arduino Pro Micro chip, but I wanted some more professional.
Below I added the ...
- 11
0
votes
4
answers
131
views
Purpose of a MUX with data selector tied to GND?
I am studying the schematic of a SDR board, and I've noticed that one input (the PPS) passes through a MUX that has the data selector pin tied to GND --- thus effectively always choosing the PPS ...
- 25