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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4
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1answer
57 views

Eagle: polygon pour leaving funny blank areas

I am doing ground pours on both the top and bottom side of a two-sided board. The top side fill seems to work fine, but the pour on the bottom layer is leaving a bunch of odd shaped blank areas (see ...
1
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2answers
81 views

Connectors in high volume manufacturing?

How are connectors such as USB handled in high volume manufacture? Would the panelized board leave room to place these connectors or would the panel be cut apart and the connectors added later. Is ...
0
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1answer
32 views

Altium Via stitching vs Via Shielding

What is the difference between add stitching to net and add shielding to net ? In my understanding in both case it create via to shield some part of the cricuit...
3
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1answer
30 views

Differing Hole Notations In Eagle CAD?

I was just creating some vias in Eagle and was playing with the drill diameter, and for some reason Eagle seems to put differing notations around the hole when the size changes, is there any reason ...
0
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1answer
80 views

PCB lab equipment

I was thinking of buying parts to make equipment for PCB production. I have the knowledge and the experience with PCB production from school (about 10 years ago), but I have no knowledge about the UV ...
4
votes
1answer
95 views

How to estimate the required PCB surface area for SMD power resistors

I am migrating a design from through-hole parts to use as many SMT devices as possible. There are 7- 2 Watt power resistors in the current design. These are metal-oxide resistors that have crimped ...
3
votes
1answer
83 views

Choose the size of via for shielding and stitching

How do you choose the size and the parameters related to via stitching and shielding when you need to create a shielding on pcb around a RF micro strip? OPTION A OPTION B
0
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0answers
43 views

Modify Si4703 FM Tuner evaluation board to add an external antenna

I have this Si4703 evaluation board which I would like to modify to attach an external antenna. The board usually uses the plugged in headphone cable as the antenna. Here are the relevant schematics:...
-3
votes
0answers
41 views

PCB in Proteus 8 [closed]

Does anyone know how can I open scheme which I made in Schematic Capture in Proteus 8 in PCB Layout? So far after I finished my scheme in Schematic Capture (iSiS) I tried to open it in PCB Layer (...
3
votes
1answer
56 views

Guard Ring Nuances

I am working on a project for work and the OP-AMP we use requires a guard ring on the inputs. The original product was designed by another engineer we no longer have contact with. I'm revamping that ...
0
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0answers
35 views

Altium trace length vs signal length

I've seen both of these in the PCB tab when editing the PCB board in Altium Designer.. what are the two? I thought I new, but I have fully routed traces with signal lengths of 0 as well as signal and ...
0
votes
1answer
62 views

How to connect a headphone jack to this lm386 [closed]

I would like to attach a headphone jack to this board but I'm a bit confused as to how since the jacks I find have 5 pins but this only has 2 places for the headphone cables. Thank you in advance ...
2
votes
2answers
423 views

Electronic components without rust or corrosion

Is there any sort of special conductive material that doesn't rust or cause corrosion?
3
votes
3answers
148 views

Why filter through hardware?

I am trying to measure a signal with a voltage amplitude between 10-100 microvolts and a frequency between 7-30Hz. The guide I am following suggests filtering out 60Hz noise using a notch filter, as ...
0
votes
2answers
62 views

Gnd Loop for Bypass Capacitors

Can anyone explain if it's good to have the Gnd pin of a Bypass Caps tied to IC's Gnd? I've observed some design using those methods. Just want to have a justified answer. I'm not sure if the ...
1
vote
1answer
71 views

Draw routing on PCB without components

Is there any way to draw routing on a PCB in the software PADS Layout without any components, like the CAD images below? If PADS Layout doesn't work, does Eagle have this function? Also, can I resize ...
2
votes
1answer
39 views

how to choose layer stack?

How do you decide the value of your stack layer ? Dielectric constant, thickness, material for prepreg, core, thickness of conductor in oz... What is your methodology to do so ? Do you only relyon ...
3
votes
1answer
66 views

RF microstrip track parameters calculation

I am currently finishing the design of a board where there are two antenna microstrip on the surface of the top layer. I have a 4 layer PCB. I use FR4,so I suppose dielectric is 4.6. Thickness of the ...
2
votes
1answer
108 views

PCB solder mask inconsistency

We have a small PCB that has been manufactured and assembled several thousand times. However, the last lot showed inconsistencies with the solder mask: It looks like the solder mask is very thin, ...
5
votes
3answers
515 views

Routing at right angle on via? [duplicate]

I heard it is usually better not routing at 90 degree angles. However what about with via, as I've read that it is usually recommended to use one layer for horizontal and another layer for vertical. ...
0
votes
2answers
65 views

Altium PCB Layout: The Difference of Through Via, Micro Via, and Burried Via

This is my very first time doing 4 layers PCB layout. What is actually the difference between Micro Via and Buried Via? Say I have Layer 1, Layer 2, Layer 3, Layer 4. What I know I use the Through ...
0
votes
1answer
51 views

How to decide and calculate parameters for track on differential pair?

I am a bit lost about how to establish the parameters to establish differential pair routing. I am currently trying to route several differential pair and I am a bit new to this. I have searched ...
0
votes
1answer
37 views

EAGLE: Just Routing and Drilling

I am trying to find the simplest way to mill this PCB with an Othermill: Image 1 Image 2 I currently have both images saved in the R13 DXF format. Basically, I'm trying to force the Othermill to ...
1
vote
3answers
110 views

Resources for designing 4 layer PCBs

I have designed many two layer PCBs using Altium Designer. Customer has asked me to design a 4 layer board. I have searched the internet but I can't find any appropriate guide for switching from a 2 ...
0
votes
1answer
70 views

Programming cortex m0+ soic for coustom pcb [closed]

I need a little help. I have designed a small HAVC system, controlled with different sensors which each is connected to cortex m0+ mcu-s. I have tested my program on development board. Now I have to ...
0
votes
2answers
47 views

Connector with pcb

I would like to have a SMT USB C connector with many pins attached to a PCB I am about to design. Since they are quite tricky to solder I was thinking to buy one with a small PCB already attached, ...
-5
votes
3answers
48 views

Differential pair how to decide track width, spacing and lenght matching [closed]

I am currently routing a pcb where there are some differential pair: Speaker, Mic. How do I decide what should be the space between both tracks and what should be the width for the traces ? I add a ...
0
votes
1answer
59 views

when do we need to apply high speed PCB rules ?

i'm new to pcb design and i'm wondering that starting from which frequency range we need to apply the high speed PCB design rules and techniques ?
0
votes
1answer
139 views

what is the frequency required to have all harmonics which have more than 10% DC value when we have 250 MHz clock?

A Digital board has a Unipolar square clock of 250 MHz. If the clock on the board at all places should have all the harmonic components which have more than 10% of DC value, the board has to be ...
1
vote
1answer
97 views

Why do some PCBs put vias around mechanical through-holes? [duplicate]

I've noticed this more and more now that I'm designing PCBs often. Below is one example, from a motherboard. Note the eight vias around the through-hole used for screw mounting. What is the ...
0
votes
1answer
99 views

Does this circuit look proper?

We have to draw 3A in peak bursts, so I computed 55 mils wide for this amount of current. The footprint on this drawing is of a transistor, that has a small footprint. Would it be best to keep it this ...
0
votes
1answer
59 views

Weird value of track width with calculator

I am currently working on a design where the power input will be connected to battery of car. I have a series of LDo and DC-Dc but the entry point is 9-36v and I am unsure what the current can be . I ...
1
vote
1answer
68 views

Power supply positioning in PCB design

I am currently routing a PCB. I have several chip and several LDO and DC-DC to power those chips. I am shared between trying to group all those LDO and DC-DC in one area of the board (in the corner) ...
1
vote
1answer
78 views

Designing PCB in KiCad

I'm trying to do my first PCB in KiCad and came across a few problems. Here is how far I got: My questions are: 1) The LM358 socket and the capacitors I put do not have holes. Only the resistors ...
-1
votes
2answers
92 views

Is length matching is necessary on I2C, UART signals, and SPI? [duplicate]

I am currently designing a board where there is a UART, as well as SPI and I2C, should I length match or take care of differential pairs on those interfaces?
0
votes
0answers
21 views

Assigning LED in the schematic capture to a package in proteus

How to assign LED's in schematic capture in the proteus in to a package inorder to use it in the PCB layout. I am designing a sensor board for a line following robot. I designed it in the schematic ...
1
vote
2answers
44 views

Interfaces with differential pairs during PCB Design

I was wondering where I could find a list of interface which require differential pair or particular design rules ? I know for example that USB require different pair routing. I identify them because ...
0
votes
1answer
51 views

designing trace anthtenas for 2 sets of rf rx+ tx

First of all forgive me for my mistakes, English is not my main language. I want to design a custom pcb (i'm not an expert just a hobby), I have a working breadboard circuit of an micro controller ...
1
vote
2answers
41 views

Humidity and temperature considerations

I am working on a system similar to a 3D printer, which works with stepper motors, heated bed and an hot air fan. This system will work inside a chamber, with a temperature around 4 degrees and around ...
2
votes
5answers
120 views

Bypass capacitor placement

I have the current schematic with a full line of capacitor which I suppose are by pass capacitor. As you can see the schematic show a unique point of connection on the 56 pin however I suppose that ...
0
votes
1answer
25 views

Capacitor for TF CARD placement on PCB layout

I am currently laying out a PCB where there is a TF CARD on it. The schematic is as below. I have this capacitor to place which I suppose might be a decoupling by pass capacitor, so unless my mistake ...
1
vote
2answers
16 views

How to determine which size of surface mount resistor for an ADMP441

I'm relatively new to reflow surface mount soldering and am unfamiliar with the various sizes of components. The PCB design I ordered is here: https://oshpark.com/shared_projects/ypqAU3CH But I ...
0
votes
1answer
25 views

Read Thyristor(Triac) specification

I have this Triac which I believe is failed because of a hight current we had in the house. The varistors that were next to it were totally burned. I am trying to buy some online, but I really don't ...
1
vote
2answers
58 views

PCB layout ideas for multiple voltage power lines

I am new to designing PCB boards. I have been working on a data acquisition board and it seems that four layer board will be correct way to go about it. But there are a lot of different voltages ...
0
votes
1answer
34 views

Help identify a component on VS-TY2662-V1 LCD driver board

I just received what seems to be a faulty driver board for a 7inch LCD touchscreen. As soon as I opened the package, one of the components fell out of the static-protection bag. I'm now trying to ...
-1
votes
1answer
36 views

How to set required spacing between two connectors pad on eagle cad soft?

I have 2 pin screw terminal in my project like this one. But I can't find screw terminals with 7mm spacing between it's 2 pins in eagle library. So, I have decided to use pinhead library to create 2 ...
0
votes
1answer
49 views

How to determine the value of an SMD coil?

I am trying to repair one PCB where an SMD coil seems to be burned out. I would like to replace this component, but I have no idea about how to determine the value of this SMD device, because it is ...
0
votes
2answers
88 views

Could electromigration cause a short circuit in a PCB

Is it possible that electromigration cause a short circuit in a PCB? Theoretically due to chemical potential difference between gold and nickel (1.68 V) it's known that metal ions can penetrate into ...
0
votes
2answers
115 views

How do you check your schematic before passing to layout [closed]

I am working with Altium. What verification do you particularly do when going from schematic to layout in terms of electronic and in terms of capture ?
0
votes
1answer
42 views

Eagle PCB change drill size of all vias of a specific size

I have designed a board and there are many vias with 8mil drill sizes. I just found out from the manufacturer that the smallest drill size is 12mil. Is it possible to change all 8mil drill sizes to ...