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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Voltage drop in OPAMPS
I designed a PCB to monitor temperature, pressure, voltage and current. To monitor the temperature I am using thermistors conditioned with a voltage divider, the output of the divider goes to the ...
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Reverse engineering an printer rotary encoder [closed]
I'm trying to make an diy steering wheel and I have an encoder (I know the pinout). Will it be ok for this?
https://es.aliexpress.com/item/1005002435277981.html
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How to read schematic for PCBs [closed]
How do I learn to read a schematic and understand the function and how the circuit work? Where can I find information about the schematic symbol and how it work and why some circuits look the way the ...
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Altium: Exclude Keepout-Layer from Clearance Rules
I'm designing a PCB in Altium Designer. I've defined Clearance Rules for certain nets. When I run the DRC (Design Rule Check) I get errors that the Clearance between the Keepout and the Pad doesn't ...
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Charging IC for a 1S or 3S Li-ion battery
I have quite specific problem; I'm designing a PCB for my robot, that is used the main board for controlling motors, gathering data from sensors, etc.
The whole PCB will be designed as a Raspberry Pi ...
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Pull up or pull down resistor for potentially unused inverter input?
I'm using this TI Inverter that mandates that the unused inputs never float.
Sometimes, the inputs will NOT be used, and other times, all 6 will be used.
As such, it seems like I should use a pull up/...
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Should two different DC power supply GNDs be connected to each other on a PCB?
I'm making a small project that drives a few DC motors with H-bridges.
+12V DC will come from one DC power supply (regulated to 10V for motors,) and then +5V will come from another (different) DC ...
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Earth for custom POE+ board design
after getting the center tap pins for poe, I have an example schematic to design an EARTH ground. I have the understanding that that would be our Earth in AC over cabinet. That would remove our value ...
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Inductor sign with single line on the top
I am new to schematics, so can someone help me understand what this part of the circuit means? What does "FB" stand for there, and which components should I use? I guess these are inductors, ...
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FPGA output timing explained
As a hardware designer you have consider the timing constraints of both the input and output device. Input devices specify a setup and hold time reference to the clock (the time in which the data ...
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STM32H7 flashing problem
I have been having a problem with my STM32H725IGT custom PCB, because I can't flash it even though i tried almost everything. I have tried flashing from nucleo's programmer and from stlink-v2 clones ...
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FFC connector with solder terminals on cable entry side
Are there any FFC connectors that have all solder pins on the same side as the FFC slot (i.e. where the FFC cable is inserted).
I know in most situations / designs this wouldn't make any sense, but I ...
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Designing PCB with AC Live and Neutral on two layers
I'm designing a smart socket that will route 240V AC Live and Neutral to a voltage regulator and also to a relay that will control the current flow. Due to the limited space, it will be easier to ...
CommunityBot
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PCB shunt BLDC controller current sensing
I am building an ESC. Motor: 22 V, max. current 90 A. Battery: max. current 60 A. My controller is a MIC4607.
The PWM frquency is 16 kHz, but I will try to get 20 kHz later.
As you see there is a ...
CommunityBot
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Attempting to patch the "G75 Bug" on a Gerber Level
Context
I am currently looking for alternative PCB manufacturers for my company and have sent Gerber files to some (Chinese) companies.
These Gerber files have already been used in the past by various ...
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How to specify the stiffener for ordering Flex-PCBs at JLCPCB
I have a Flex-PCB design that contains several areas that are supported by stiffeners. I am trying to order the PCB at JLCPCB but can not figure out how to specify the areas where the stiffener is ...
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Steam Deck: how to solder 3 pin bumper button with one missing (ripped-off) solder pad?
I don't have a lot of experience with soldering, but I can manage small repairs and I regularly watch TronicsFix's repairing videos (like this one for the same issue I have). Quite lucky, right?!
So ...
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PADS for land pattern coilcraft
How can you even make a footprint/ land pattern with this info. Is that land pattern the pads? Is that a wire going into the model, meaning my pad just needs to touch either side of the component? ...
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Identifying IC used in keyless entry module of automotive board [closed]
I am repairing a PCB board and need a datasheet for 8-pin IC with top marking BZAENA for replacement. Its dimension is 4.9 x 3.9 x 0.9 mm. This IC is used in a keyless entry module.
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Microcontroller VDD and VSS pins are shorted. Does that mean the MCU is fried?
I recently created my own breakout board for a STM32F030R8T6 MCU. The attached image shows the PCB that I designed for it. There are no components, only top copper tracks that get connected to header ...
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ESP32-C3 Custom board flashing using USB issue - Invalid head of packet 0x47
I built a custom board using the ESP32 C3 with inbuilt flash. Because I need to use the least space possible, I decided to use the function of this chip to be flashed via USB. When I connnect the ...
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Vias directly on SMD pads?
I was looking at an example board schematic provided by TI and I noticed something rather curious: vias were placed directly on SMD pads.
Is this a normal/acceptable practice to follow, or is it ...
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Do we need to guard the input traces of an audio power amplifier?
This is a continuation of this question. I am using an LM4670SD/NOPB in my design. The IC has a 5 V supply.
The input of the power amplifier (+IN & -IN) comes from a smart module from Quectel.
...
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Is it possible to modify 8-pin Christmas tree LED controller's functions?
Intro
I have an 8-function artificial Christmas tree. The 2-wire LEDs have eight different lighting settings. The control box of the tree has a pushbutton that I can depress to cycle through the ...
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DDR3 Termination Resistors and VTT Capacitors
I have a DDR3 implemented in our current design with 50 Ohm 0402 termination resistors and 0.1uF 0402 decoupling capacitors to VTT on the address, data and control lines. The design is working well ...
CommunityBot
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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-...
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How do I find current consumed by circuit designed on surface mount PCB without damaging PCB? [closed]
I have a circuit designed on PCB, and components (resistors, capacitors, diodes, microcontrollers, etc.) are all surface mount. I want to find the total current consumed by this circuit. I have traced ...
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PCB assembly cost per-board
I know this question might get closed because of being opinion depended but I couldn't find any answer from google or any other search, so I decided to ask it here.
For clarity of question I want to ...
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Pros and cons to round PCB design
This is mostly out of pure curiosity, but when designing a PCB, are there any pros to going with a rounded or circular shape? I can see the obvious con of losing out on surface area for running traces ...
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Do you put a ferrite bead on both the positive voltage and GND trace?
I'm designing some basic DC power filtering for a very simple PCB. Do ferrite beads go on BOTH the positive voltage trace AND the GND trace, or should GND be completely free?
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Astable Multivibrator Not Oscillating
I've been trying to get the Astable Multivibrator Circuit to work for a long time now, and I think I lack the knowledge to understand what's going on here.
The situation is as follows: I've checked ...
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Audio Power Amplifier Layout clarifications
I am using LM4670SD/NOPB in my design. The IC is working at 5 V supply.
This IC requires an 8 Ω speaker.
My first question is,
In that case do the lines Vo1 and Vo2 needs a differential impedance of ...
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What is the best way to use 0 ohm resistors for a large number of signals?
I'm fairly new to PCB design, so maybe I start with a basic 0 ohm resistor like this:
I have both output pins (SLEEP & RESET) on the DAC chip. I want to have two options on my PCB, one with 3-pin ...
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How to decide the number of layers? [duplicate]
I am new to PCB design and I want to understand how exactly we should select the number of layers. I just know more layers helps us with making the routing easy but I don't understand what is power ...
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Reprogramming MCU Flash Memory I/O placed on a PCB of a mechanical keyboard
I've decided to modify some things about my mechanical keyboard (Hermes M1), so I tough starting with installing the software driver it's a good idea. Thus I've changed some things about lighting of ...
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PCB from circuit diagram [closed]
Can anyone please explain why this U1A and U1B is there and how can it be converted into a schematic in Easy EDA?
(Source: https://m.media-amazon.com/images/I/610mQaFartL._SX522_.jpg )
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What is this comparator in the Arduino Uno Revision 3 doing?
I was looking into the schematic of the Arduino Uno Rev3 particularly the built-in on board LED (connected to pin 13) and was curious about what was happening.
Here you can see pin 5 of port B being ...
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How can I edit a pre existing component in Altium design?
There are some simple component in Altium Desing like LED or Diod or Resistors but How can we edit or modify them because its schematic and pins are good , I want to add a 3D object or some text or ...
CommunityBot
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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-...
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FT232H on PCB Causing "USB device not recognized" Error on Windows
I have designed the following FT232H circuitry into a board on which I require a USB to I2C interface:
This circuit largely comes from the schematic for the UM232H eval kit (which I have and it works)...
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PCB with Mixed Analog and digital
I am in the process of designing a new ADC\DAC PCB with a digital interface and analog front end. I have tried to separate the different grounds in my circuit to reduce the noise as much as possible ...
CommunityBot
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Does measuring current with a multimeter in series affect battery life?
I have noticed that a lower-power device that I am testing is running out of power much sooner than it should. The device should last up to 2 years, however, it is running out of battery at the 5-...
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Can I convert a mini guitar-amp into a portable auxiliary speaker?
Being a guitar player, my brother got me one of those guitar shirts for Christmas that has a board with pressure sensors attached to it and an actual miniature amplifier. When the sensors on the board ...
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Allegro padstack not showing my pads
I have implemented a schematic for an IC (BGM13S32F512GA-V2R) and I am trying to create a footprint but when I try to place the padstacks, they do not appear in the default library... so I went into ...
CommunityBot
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Altium PCB Dashed Lines
I'm using Altium version 22.6 and I am wanting to add dashed lines on my PCB on the "Top Overlay" layer. I've seen plenty of references to dashed lines on versions 21 and before but none ...
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How can I protect this gate signal trace from EMI?
I'm designing this board which will control current through a coil using an IGBT. The coil is 500 uH and is mounted around 3 cm above the PCB and will handle peaks of 400 A. Because of the close ...
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The output of ADC (AD7091R-5) is slowly rising with constant input
I have a circuit board with an AD7091R-5 analog to digital converter. I'm reading the output via I2C using a particle board (much like an Arduino.)
I'm reading the register for channel 0 and 1 as I ...
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PCB design for Renesas' DA7212 audio codec
I'm designing my very first PCB. I managed to route all my components and I'm stuck at the last footprint - DA7212 from Renesas:
Those balls are both incredibly tiny and packed dense. I'd need a ...
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ESP32-WROOM-32E Custom PCB Failure to send LoRa Packet
I am having troubles trying to send a LoRa packet to a receiver. In the serial monitor I am stuck in the while loop and it keeps printing dots. Below is my code and I will attach a photo of the eagle ...
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Safety of making PCBs
I've been making a few hobbyist PCBs at home and note that the photoresist developer and ferric chloride etch solutions are both pretty nasty chemicals that come with all kinds of warnings.
So I've ...
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