Questions tagged [pcb-design]

About designing the boards which carry the components of an electronic circuit. For questions about getting them built instead use PCB-fabrication. If your question is specific to a certain CAD tool, say which tool and version you are using.

229 questions with no upvoted or accepted answers
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51 views

DC Motor doesn't change from lock to unlock

Can someone tell me why the motor doesn't change from lock to unlock? I designed a PCB circuit wich controlls the Motor movements and Lock. The motor has a magnetic lock. When switch to Unlock mode , ...
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21 views

USB On-The-Go setup for PIC32MK and bootloader

I am looking to utilize the USB OTG module of the PIC32MK0512MCF064 and would like to make sure I understand USB as I have not used it and I didn't find a post with my scenario yet. The goal is ...
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2answers
57 views

How to connect a few shields correctly?

There are several shields on my PCB: shield on CAN-bus, on RS485, on Ethernet, on ENCODER motor signals. How do I correctly connect all these shields? If I use the star topology, which filters should ...
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63 views

How to determine vias and through holes from 4-layer Gerber files

I'm trying to understand the difference between the vias and plated through-holes in these reference Gerber files. On layer 3, I don't understand why there are so many holes (vias)?. Why are some ...
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35 views

Antenova M20057 active antenna is not working

I have decided to use Antenova product which is M20057 (datasheet) as an active GPS antenna. I am using Quectel L96 GNSS module. There is an internal chip antenna on L96 module and I have tried the ...
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16 views

xpedition designer

I am here to clarify regarding on schematic creation using mentor xpedition designer,I finished my schematic drawing using xpedition dx designer so now i want to take my work another level(layout) for ...
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46 views

Create Nixie tube pin connector socket in eagle cad

I am unsure how to properly layout a socket for a nixie tube in eagle cad. I'm especially unsure how to match the exact dimensions and what tool in eagle to use to create a hole with copper on both ...
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46 views

UART communication not working without injecting voltage in pin headers

I have a bluetooth module (rn4020) talking via UART to a stm32f103c8t6 MCU in a custom PCB, I also have an OLED screen and some pin headers for listening what either module receives (as seen in the ...
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1answer
57 views

Oscillator connection

I have two questions here for how to connect the oscillator to a microcontroller (SPC584b): How can I determine the values of the capacitors? What is the need of SB2 & SB3?
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33 views

Controlling a series of LEDs ( AC->DC via bridge rectifier)

I'm working on a PCB (Christmas Present) to take in A/C to a string of LEDs and control them (with transistors? and a microcontroller). This is a bit out of my league, but it is making me learn ...
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1answer
62 views

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 ...
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33 views

Making a more efficient replacement for my diode

I am making a boost converter using the LM3481 IC (although it might be considered a sepic topology as well). Typically in a boost topology, you put a diode before the output capacitors so they don't ...
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60 views

Ground Planes, 0v or GND?

I have a board that has a dual voltage isolated DC-DC converter on it. The converter takes 0 an 5v in and gives -5,0,5 v out. The 0v of the input is actual ground. Most of the PCB uses the isolated ...
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34 views

Is it ok to put GND and VDD pours below IC (AS7265x)

I am designing a PCB to use with the AS7265x sensors. The datasheet states, on page 51: In order to prevent interference, avoid trace routing feedthroughs with exposure directly under the AS7265x ...
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1answer
31 views

Altium Designer multi sheet design quad op amp

I have to design an multi channel sampling device: there is an input stage with some filters, then digitization of them and some supplementary circuit. To create a filter, I want to use quad op amp, ...
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24 views

Parasitic Inductance - DPT circuit

I have a question about parasitic inductances. Let's take the figure below as an example, a DPT circuit is shown here. I have added an inductor (parasitic loop inductance). I would like to have a ...
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71 views

Altium net has only one pin in hierarchical design despite port connection

I am working on a multi channel hierarchical design in Altium 19 and getting an error 'net has only one pin' for all signals contained in buses routed between two sheets. Below is my top level ...
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40 views

Relay Switching MCU Hanging/Reset

I am working on samD21 MCU to control the 16 relays. I am also using a circuit to detect the input AC switch status On/OFF (Connected serially to the relays). This is connected through optocoupler ...
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23 views

Linking Attributes/Parameters in Altium Designer PCB

I have a test board with one unplated through hole pad and a string that needs to say the diameter of the hole in the top copper layer as shown: I would like to link the hole size and the value in ...
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11 views

Termination mode for CoolRunner CPLD (XC2C32A)

Fitting properties in Xilinx ISE offers some options for -unused and -terminate: ...
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1answer
31 views

PWM low frequency generation low current draw

I'm a mechanical engineer with the work assignment to develop a low current draw PCB to control a servo mechanism. The device must work on two 9 volt batteries in series (the device must deliver an 18 ...
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20 views

How do I design a circuit with overload and shortcircuit protection for a multi-usb type c powered hub only?

I am planning on getting a number of raspberry pi 4, for now we will say room for 5. They have usb type c connectors on them, and can receive 5v at 5 amps. Therefore the total amps is 5 ports * 5a ...
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1answer
48 views

Serpentine PCB heater size calculation

So, I'm kinda new to the field and the time has come to design my first PCB heater. The main concept is to drive it using a Raspberry Pi and a temperature sensor as feedback. Here is the whole ...
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41 views

RF sampling ADCs(ADC12DJ3200 ),PLLS and regulators placement and layout

I am novice in PCB component placement and layout. I have just started my career in Hardware design. We have designed a schematic for Data Acquisition System. In our design, we are using three RF ...
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1answer
135 views

Can resistive traces be created on a PCB?

I'm assuming that copper traces on a PCB have negligible resistance. Is it possible to put a trace on a PCB that has some greater amount of resistance? The amount of resistance would not need to be ...
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10 views

EP53F8QI Short to GND fault

We have a design with an EP53F8QI that multiple ICs have been burned both at room temperature and +80 °.C. We are using it to create a +3.3V and on fault we have found that the +3.3V supply is shorted ...
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31 views

How to use ESP-WROOM-32 to send wireless TX and RX commands from a PIC?

I want to have the possibility to send the commands of a PIC in a way that it's wireless and I thought it would be a good idea to use a ESP WROOM 32. In the datasheet it has the following schematic: ...
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3answers
81 views

Power planes in PCB

I'm designing my first PCB (two layer), the project is for an amplifier based on OPA2134. The design/amplifier requires to have +12V, GND and -12V. The power for the amplifier comes from a ...
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1answer
84 views

Copper layer delaminates on Printed Circuit Board

I have been making the PCB boards by the conventional process since last few years (pressing, etching, drilling, soldering). I usually iron the photo paper to the PCB board for around 15-20 minutes ...
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63 views

GBE (Gigabit Ethernet) Magnetic Coils Connection Order

I am designing a MEZ PCB and I need to connect the GBE coils to the assigned pins of single board computer's MEZ connector. My trouble is I do not want to use any more via for this connections. Hence, ...
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70 views

Clapp oscillator PCB not working when ground pin is connected

I have designed a Clapp oscillator working at 25MHz. The catch is I designed the circuit to be a part of frequency compensation network. So, I incorporated a few reverse-biased varactors whose ...
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42 views

BQ2057WSN Circuit Heating issue

We are using BQ2057WSN charging IC to charge a 7.4V, 6600mAh Li-Ion Battery by providing 12VDC,2A power supply. According to my calculation the charging current is set at 625mA. But while charging, ...
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1answer
211 views

Can't update my schematic to PCB layout in Altium

I have finished my schematic for an echo circuit using PT2399 IC as per the application circuit in datasheet. I have downloaded the part (including footprint) from snapeda.com and updated my Altium ...
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2answers
64 views

How to connect the GND with the metal case of the robot

I have a PCB design inside a metal case of the robot. The robot is mobile, it moves on wheels. The problem is how to connect the GND with the metal case of the robot. Direct connection is not safe, ...
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39 views

How to design signal return paths relative to bypass capacitors and IC power pins?

I'm working on a two-layer PCB with some analog and digital elements, as well as an ethernet chip (ENC28J60). I've placed and routed the bypass capacitors for the chip, but now I'm wondering what's ...
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43 views

Figuring out Inductance

I am trying to figure out the Inductance used on this PCB. I know it's value but need to understand what type of inductor it is and other things so I can order it. The code on it ...
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70 views

Altium: Repeating SPI/I2C Blocks

What is the proper way of repeating I2C/SPI blocks? Since we know in the case of SPI blocks, MISO, MOSI & SCK must all be tied together in a single bus for communication to happen. I have read ...
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129 views

How can i identify these chips

I have a board that has 4 chips that have their markings being removed. I'm not able to identify them. I'm looking for a way to identify them. I have actually two different boards made in different ...
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42 views

Routing extra IO traces across MCU IC without crossing USB lines

I'm currently designing a PCB using an STM32L433CB LQFP48 chip. The design uses the USB connection to communicate with an external PC. USB is configured to Full Speed (internal pull-up on D+ line) and ...
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158 views

How to calculate stray capacitance on PCB

I use a 0.4mm spacing between PCB traces (including 0.4mm space between crystal pads and ground) and I believe that's causing stray capacitance. My circuit board is typical (1 ounce copper on FR4 ...
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53 views

“Solder PCB” or “Flying Lead” high voltage connection for a reed relay model?

I'm searching for the HV reed relay solution for channels multiplexing printed board design: V < 6KV, I < 10mA. 8 relays that connect 8 input pins to V or GND (given for an external supply ...
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1answer
108 views

Multiplexed LED column driver MOSFET doesn't fully turn off without a resistor parallel to the LEDS

I have a board with a 16x10 led matrix. The columns are switched with DMG9933 Dual P mosfets. The rows are driven with a constant current led driver ST STP16CPC26 (similar to TI TLC5956) I noticed ...
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1answer
59 views

Where should I put my switch - on the enable of my SMPS or the power input?

I'm designing a simple board with a FitiPower FP6717 step-up converter chip (Datasheet) and a mechanical switch (SPDT) to enable or disable the output power. My design for the boost will be very close ...
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2answers
137 views

PIC32 UART TX working perfectly RX not

I am using PIC32MM0064GPL028 to drive RGB+W LEDs via TLC57911 LED drivers. The idea is - data from python script -> Easysync USB to RS-485 -> ST485ECDR transceiver -> PIC32MM0064GPL028 -> TLC57911 -> ...
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72 views

Power line between data lines

I am finalizing my design which connects a USB Controller (FT601) with the FPGA (MachXO2). There is last thing I am not particularly happy about and I would like your feedback on that. In the ...
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45 views

How to perform parasitic extraction in CST Studio?

I'd like as the title suggests to perform a parasitic extraction of an inverter PCB design using PEEC Method in CST Studio Suite but, unfortunately I can't seem to find documentation or resources ...
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28 views

Highlighting feature of any net becomes latched on in Altium 17.1 PcbDocs

When routing a net, highlighting of startpoint/endpoints is great, but when a net I am no longer working on remains highlighted, it becomes an annoyance. This is happening multiple times a day and the ...
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71 views

Move part to bottom layer without mirroring in Eagle

How can I move a SMD part in Eagle to the bottom layer without using mirror? The resulting PCB should have the SMD pads on the bottom layer but mirrored (if you turn the PCB and look on it from top ...
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1answer
27 views

Telit cellular module pins connection

I have the UE910 cellular module from Telit. I have manufactured a PCB containing the module but it's not working (power is reaching it but serial program not communicating with the tx and rx pins). I ...
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2answers
170 views

Measuring 0-240v 50-60hz Mains AC with Arduino/MCU

What is the proper way to measure 0-240v 50-60hz Mains AC with an arduino / 3.3v mcu? (Edited to include a diagram of a proof on concept, which is transformerless) Can anyone confirm that this is ...