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.

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Can I use a connector at a higher amp if its lower voltage?

I'm making a PCB board where I'd like a barrel connector rated for 10 amps. I have been using part this part which is rated for 10 amps at 50V. https://www.digikey.com/en/products/detail/globtek-inc/...
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CMOS Analog Multiplexer SPDT

I have tried to use the QS4A205 (a CMOS ANALOG FOUR-CHANNEL SPDT MUX) where 2 buffered DAC outputs are connected to the SPDT inputs and the output of the MUX is connected to a low current draw node (...
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How to construct a 4 input AC AND logic gate?

simulate this circuit – Schematic created using CircuitLab I have four different safety switches connected to four different devices. If one of those safety switches trip then I want a signal to ...
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Ground Pours or Thieving for Filling Unused Space on PCB Signal Layers

Often at the end of a PCB design there is unused space on the signal layers. It is important to fill this space because of: The electroplating process (valid only for TOP and BOTTOM) The even ...
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I2C communication from board to board with flex rigid issues and consulting about it [closed]

I need to design flex rigid board from Sensor Board(Block Diagram attaching under the questions) to Terminal Board the Sensor Board contain Proximity sensor that works with I2C bus, and board2board ...
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12V 1.5A through a switch [closed]

I am making a really simple electrical circuit for a school project. This is the first time I've done this. The buttons I have are rated for 50mA@24V but I need a power supply of 12V 1.5A to use ...
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How do I find out what pins of an Intel FPGA can be used to connect to different pin groups in EMIF?

If I want to connect my Intel FPGA using EMIF to a high speed DDR Memory e.g Cyclone IV E to DDR3 memory or Max 10 to DDR2 memory, how do I find out what pins can be used for the data, strobe, clock, ...
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Bridge Rectifier Problem or something else?

I am designing a 30V 5A power supply and after simulations working fine I decided to make it on actual hardware. But during the first run, something shorted and the power supply didn't even turn on. ...
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OrCAD Capture to PCB Designer Standard synchronization Problem

I am a new user of OrCAD. I can draw a schematic in OrCAD capture. But when I try to Launch Design Sync, there pops up a window entitled "New layout". In, the "Input board file" ...
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2 votes
1 answer
204 views

PCB Design Review Request

I am designing a MIDI controller board. It's my first board ever and I was just wondering if people could check a part of my design for potential problems and shortcomings. Each section is controlled ...
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4 votes
2 answers
637 views

Capacitance of a PCB via

In this article, there is a section that models the capacitance of a via. The equation given is: $$C=\frac{(0.55\epsilon_rTD_1)}{D_2-D_1}$$ Where T is the board layer thickness, D1 is the pad width ...
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First PCB layout but can't validate yet [closed]

I'm learning some basic circuitry with an ESP32 Dev Kit and copied some schematics online to connect the ESP32 to external power, a relay and an input reed switch sensor. My problem is I'm still ...
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12 votes
3 answers
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Why does my MOSFET always burn?

I have a circuit that uses a MOSFET to power a resistive plate to heat it up. The problem is that this MOSFET always burns after a few seconds. Let me explain my circuit: First, the outlet AC voltage (...
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How to correctly terminate a TTL line between two ICs?

I am designing a circuit to convert a 5ns ECL signal to an LVTTL signal of >10ns. The SY100ELT25 is used to convert the ECL to 5V TTL which is then fed into the SN74LVC1G123 to further reduce the ...
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1 answer
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Altium designer routing blocked by old board shape

I am trying to re-route my board, so I changed the board size using the "board planning mode". Now, I'm routing, and some tracks are "blocked" by something looking very much like ...
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1 answer
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How to implement a Bookbinder PCB design in Altium

I am planning to design a bookbinder with airgap rigid flex PCB using Altium. Based on guidelines from Altium, and various other sources, it is important to have "staggered lengths", to ...
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Running 230VAC through a PCB

I've currently got a system which runs 230VAC, 24A through a series of 3 groups of 8 terminal blocks (8A each group, 1A per terminal block), through a relay each (8A), and then through 3 terminal ...
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IMVP9 Controller VID/SVID protocol PU resistors

I'm using MP2940 IMVP9 Controller for VCCIN (CPU Power Rail) and VCCIN_AUX (PCH Power Rail) for a motherboard that includes Intel Tiger Lake UP3 Processor. VCCIN Controller uses SVID protocol and ...
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1 vote
1 answer
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Modelling a single trace PCB?

I am trying to model a PCB trace as a R, L, C circuit. Assumption: My PCB has a a single trace running through it. Just giving input from one side and taking output from other. There is not even a GND ...
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1 vote
1 answer
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Issues programming ESP12F

I used this wiring schematic for a couple of my ESP8266-12F projects for programming mode: As I built enough confidence with the module, I decided to go ahead with a PCB design. When I try to upload ...
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8 votes
3 answers
1k views

Why is this 75 ohm resistor present in the Ethernet connector? (10/100Base-TX)

In this datasheet (and in other similar) pins J4, J5, J7, J8 are connected to the ground with a resistor and cap. For 10/100Base-TX pinout it seems they are not used (at least for modern of the ...
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2 layer PCB grounding

I have a 2 layer PCB that contains an ESP32, a LoRa module, a GSM module, some connectors to command relays and 3.3V & 5V power rails. My question is, should I set both layers as ground planes or ...
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3 answers
65 views

Altium designer PCB - Strange and confusing symbols everywhere (From DRC - Design Rule Checker)

I'm starting to learn Altium Designer, and I have this on my PCB screen: I've tried several things, but nothing works. Here is the same image, I just moved the components away: Can someone explain ...
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1 answer
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Length matching/differential pairs and distance to polygon and other layers

If you have length matching on the inner layer of 4 layer board: Do you need any minimum or maximum distance to the adjacent layers above and below? Are there any rules of thumb? Also is there any ...
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1 vote
1 answer
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Connecting the grounds on a non-isolated DC/DC converter

For isolated DC/DC converters, I know that it's a good idea to have two different grounds on both sides and that we should avoid to connect the two grounds together as the isolation is useless when ...
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How to connect shield of USB connector for powering purpose only?

I have a PCB design for which I want to use a portable battery pack (a.k.a. power bank) to power my circuit. I plan on using a micro USB B-type connector. I don't have any other application for this ...
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1 answer
52 views

Should I add ground stitching vias?

I'm designing a 2 layer PCB, that contains an ESP32, a LoRa module, a GSM module, and some connectors to command relays. The top & bottom layers are both ground planes, and I have 5V & 3.3V ...
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1 answer
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mosfet to protect reverse plarity from a power suply range 10v-18v DC [duplicate]

hello I have designed a board that operates on 10v to 18v DC (2A) I need somehow to protect it from reverse polarity, am thinking to use MOSFET but how I can drive the gate in 10v-18v range
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1 answer
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2 Layer PCBA routing strategy for high current design

I have a very simple pcba design. The only thing of value is that the traces will carry up to 30A of current. I have already decided to increase copper thickness to 2 oz for improved current capacity. ...
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3 votes
1 answer
84 views

Two layer PCB vs. four layer PCB for simple design with 30A current

I have a design which is literally just 2 connectors (input and output), a relay and a diode. Basically using the relay to connect a charger to a battery. The board size is predetermined and I can't ...
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1 vote
0 answers
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PCB with AC voltages - May earth cross paths with hot/neutral on a different plane?

I'm trying to build an AC "transfer" board that will feature: 1x DPST switch (hot and neutral will be switched) 1x power line filter Although this is my first time designing a "high ...
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1 answer
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How can I adjust the imported 3d body in Altium designer?

I've downloaded and imported the following SMPS transformer 3d model into Altium designer but it doesn't fit my footprint how can I adjust it by changing scales and moving pins?
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Exported same file in Gerber X2 and ODB++ and diffrent result

Using Altium I exported the same PCB in Gerber X2 and ODB++ and sent it to production (so they could choose what file format they preferred). The manufacturer came back asking why the design did not ...
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2 votes
1 answer
81 views

SMT Resistor Fails, but through-hole resistor of same value succeeds for op-amp band-pass filter

I am making a band-pass filter with a gain of 75v/v. Center frequency of 30k. Passband of ~30k. I used the analog wizard site (https://tools.analog.com/en/filterwizard/) to generate the band-pass ...
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0 votes
1 answer
68 views

Kelvin connections in PCB

in the following webinar from youtube, a recommendation is presented about the kelvin connection at the 41st minute of the video. but I couldn't get it. (second language) https://www.youtube.com/watch?...
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1 answer
54 views

Antenna feed trace keep it short or long?

I am designing a GPS module but am quite new to RF design. I have seen a number of people say to keep your antenna feed line as short as possible. But in the design guide of the GPS module I am using, ...
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1 vote
2 answers
115 views

Magnetic field shielding for electronics?

I am looking at an issue where a PCB design that is powered by a couple of CR2032 batteries will shut off all of a sudden in the presence of strong magnetic fields (around 15-40mT). However, when the ...
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2 votes
1 answer
108 views

Greener way to design a PCB

Lets say we are designing a very simple PCB and there is a layer(s) where not much is going on, from an environmental perspective alone would it be better to leave the layer with a large ground copper ...
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3 votes
2 answers
365 views

Drawing a very simple component in KiCad without the model

I am designing a PCB in KiCad that includes the 328ST160 and 328SR160 transducer pair. I have been unable to find a PCB symbol for the two. The physical component I have is just two pins, like so: I ...
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1 vote
2 answers
71 views

Is a high resistor value between GPIO pads acceptable?

I'm designing a PCB which involves integrating two microcontrollers - an ATSAMD51 (Cortex M4)-based Arduino, and a Raspberry Pi. I need to connect a parallel bus of 10 signals between the two devices. ...
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0 votes
0 answers
50 views

Generate multiple voltages

I have a 24V supply and want to switch 24V, 12V and 5V simultaneously with one switch. The voltages serve as Digital Inputs at 3 different Interfaces. Because the power consumption is of minor ...
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1 vote
1 answer
79 views

iCE40LP1K FPGA - Performing an analog to digital function (Power monitoring) without an ADC

I'm using iCE40LP1K FPGA and I wanted to create a block that is responsible for doing a fast power down of all devices on the platform when the 12V is shut down due to powercut. Whcih means, when 12V ...
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0 votes
0 answers
52 views

Why did my power system suddenly stop working?

I've created a wearable device with a power system that is replicated from the Adafruit Powerboost 1000. It contains a charger and booster chip. It worked for several days until the red LED that ...
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0 votes
1 answer
56 views

FR4, 1 oz. copper, PCB trace width for 48V/8A, pulsed (8 ms pulse length, up to 20Hz)?

I would like to determine suitable trace width for the pulses shown. Other details: The application is to pulse a solenoid; board size is 100mm x 100mm. An LM317 charges a 1000uF cap and the cap is ...
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0 votes
2 answers
66 views

How do I place a component in the center of the board? Altium

I'm attempting to align some components, such as an OLED display and a push-button, to the pcb board's centerline. The board was imported as STEP from Solidworks and has a non-uniform format (not a ...
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1 vote
0 answers
99 views

Could we connect one crystal capacitor to power and another to ground?

There is a 12MHz HC49 package crystal which according to TLV320AIC23B needs two 22pF capacitors to ground. In the picture below, I can't connect both crystal pins by capaitor to ground. I can connect ...
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0 answers
19 views

Going from AT-09's (BLE) Breadboard to it's SMD version

I want to go from this, https://www.amazon.com/Android-Bluetooth-arduino-Wireless-Compatible/dp/B07VDJR4JF?th=1 to this https://tiendaityt.com/modulo-bluetooth/9442-at-09-smd-modulo-bluetooth-40-ble-c-...
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0 votes
1 answer
28 views

Altium designer clearance constaint Between track on toplayer and pad on toplayer

I am a student and i want to design a PCB. I am using Altium Designer 22 and I selected 0.5mm for clearance constaint rule but i got this error. If i select 0.3mm i still got the same error. How can i ...
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1 vote
1 answer
39 views

Applying bottom Soldermask layer to EAGLE board

everyone. I have a problem with one of my designed boards. I submitted my order to PCBWay for checking my files before ordering and I was informed that there is no bottom Soldermask layer. This ...
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1 answer
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What width should I use in the dimension layer in Cadsoft Eagle?

I've designed about 20 PCBs in Cadsoft Eagle, and for the board outline I've always used the "20 Dimension" layer, using "wires" of width 0 to enclose the PCB. I did this ...
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