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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quality checks on PCBs

I am trying to implement a quality check for our PCBs. We have a pick and place machine and a vapour solder machine. But, unfortunately, even after optical inspection and such, we end up with a lot of ...
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32 views

Need advice regarding FPC design

Good day to all. I'm working on a project that uses an off-the-shelf radio module that I have to interface with. This module uses Molex FPC connectors 502250-4120 which are 41 pin, 0.3mm lead pitch ...
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47 views

Screwing up a footprint? [on hold]

Do you remember a time where you had a simple footprint error spill out of control? How bad was it, and what methods do you practice to make sure it never happens again?
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23 views

Eagle swap layers

I would like to swap two layers in the my 4 layer PCB. For example currently the ground plane is the Bottom layer, is there a way to take all the signals in layer 2 and move them to the Bottom layer ...
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1answer
31 views

Altium: Error in importing changes to PCB

When I first imported everything from schematic to a new PCB project, it all went smoothly. But note that I have duplicate schematic sheets that have the exact same circuit, net, I/Os, etc. I tried ...
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2answers
68 views

newbie confused with PCB designing a TO3 transistor

hi guys im a first year electronics student with no background on PCB designing or anything and im confused on how to connect this collectors of a to3 transistor into the capacitor cause the ...
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2answers
42 views

Layout of doubled SW pin on buck converter IC

I'm working on a PCB for the MP2617. That IC integrates a buck converter and has two physical SW pins sandwiching the VIN pin, as shown in my tentative layout below. No other pins on the IC are ...
3
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0answers
63 views

How to remove copper from inner planes on cut PCB

I'm in the middle of designing a specialized communications device that uses an off-the-shelf radio module. This radio module is larger than desired and the PCB area that is not needed is easily cut ...
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1answer
50 views

Electrostatic Potential of an Incomplete Circuit

I am trying to construct a PCB, however in one portion of it, I have a segment with only one end of it connected to the current while the other end does not and thus that segment does not have current ...
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3answers
68 views

PCB layout of buck converter: capacitor placement

I'm designing a PCB for an IC that includes a DC/DC buck converter (MP2617). This is my first PCB, so I've been using the following resources for the layout: 1 and 2 (PDF files, the first one is a ...
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1answer
34 views

Altium: Assigning testpoints

So I'm working on the PCB layout to assign testpoints to pads. I've created vias to connect to the pads as testpoints, double clicked on the via, checked the 'Assembly Top/Bottom' I then went to ...
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1answer
33 views

Replacing Power Board European Samsung TV's with an asian one [closed]

After a lightning strike, my European (Model UEXXC..) Samsung Tv is dead. I searched for a new Power Board and I found out that european boards cost 4 times more tha asian ones( Model UAXXC..). ...
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2answers
397 views

Place a component on specific height above the PCB

what I have as a big issue is the following layout with two connectors. The problem is that the connector K201 (in right bottom) is very close to the frame. This frame will the attached to a device so ...
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2answers
104 views

What's the point of this thick trace in my PCB?

I'm looking at a trace that goes from Pad 2 of a component to pin 22 of the QFN. What's the point of the thick trace at the beginning if it ends up being as small the pin where it is run?
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1answer
47 views

Unknown LCD display circuit design

I opened up the case of an old toy to take a look at what is inside. The device had what seemed to me a bizarre LCD display with a controller(or microcontroller?) I have never seen before(middle ...
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0answers
75 views

PCB Ground and Power Plane Design Guidelines

I am converting a design from through hole components to SMT components. The schematic is identica, except the maximum allowable current through an onboard a relay will be halved from 20A to 10A. ...
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1answer
28 views

Keep getting “Only input pin on net” error

I am doing ERC check and keep getting this error : only input pins on net ADC7 that net is a pin from an mcu that has a name ADC7 but is not connected to ...
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1answer
26 views

Eagle-Show all connections?

I am trying to "light" all the net labels that are connected together , to see if everything is right. So for example if one pin of a resistor called "R_A" and another pin on some other chip called ...
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2answers
152 views

What is the resistance of a typical PCB?

What is the typical resistance between two points on a "typical" PCB? Let's say the points are 1mm apart and let's assume a normal office environment. I've noticed that resistors come in many values, ...
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2answers
65 views

Switching regulator (TI LM2678) not working on load > 100mA

I am a (joung) programmeer and I recently began studying some electronics&AVR programming. I am trying to use a step down voltage regulator (LM2678-5.0) to transform battery voltage (9/12V) into ...
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5answers
160 views

single layer vs double layer PCB?

How can I choose between the two? When can I use single and When I must use double? ( speaking of simple circuits). Do I have to use a double layer when using ICs? When u If I have a circuit ...
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1answer
38 views

When are meanders necessary? and how to calculate timing differences

I've found that meanders are used for high speed traces like RAMs wires and are also used for coupled wires like in the usb. My question is, how I know when I should use meanders to keep track ...
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2answers
113 views

Connecting 2 male headers on a pcb together

I have 2 male headers like this on 2 different boards: I need to connect 2 such male headers together. One way to do this would be to use something like individual female to female jumper wires. ...
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63 views

Bridge rectifier on pcb

I am pretty much a newbie at pcb making, so please excuse me for asking dumb question. Do you see anything wrong with this. R is 1k and C is 4.7mF. I just want to make sure I do not burn anything ...
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3answers
89 views

How does EMI affect a circuit? [closed]

I was designing pcbs and my head engineer told me that if input supply is large then there should be a separate layer for ground and positive supply as this will reduce EMI effects on the nearby ...
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38 views

How to align an existing design to the grid

I have a design which I got from the internet. It seems like it is not aligned to the grid and I need to add some more traces. How should I go about adding a some pad to an already routed board which ...
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1answer
52 views

Malfunctioning H-Bridge

A PCB that I designed just came in (schematic pictured below). After soldering the components in, some things are happening that I don't understand. Most importantly, one part of the circuitry, an ...
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2answers
45 views

Altium: Plane assignment for split planes [duplicate]

How can I assign multiple nets to a single plane layer? I've assigned the ground plane to net GND in the layer stack manager. But how can I assign nets 1.5V, 3.3V and 5V to the power plane?
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63 views

What is the white component the wires are in

I'm quite new to electronics. So this will probably seem rather silly. In the image above am I correct in my assumption that the white part the wires are connected into is just a socket? There's a ...
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54 views

Do this work the same way? (capacitors)

Hi guys, I have a question... Is this two circuits the same? Like... will the capacitor act in the same way on both? I'm asking this because i'm looking to the first picture and I think that the ...
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1answer
74 views

Altium: PCB ground plane and routing

OK so I've been asking around and reading how to connect ground pins to ground. Some said create vias to the ground planes. But should I do that for every pin? Because sometimes when I create via to ...
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1answer
53 views

Connector Selection Criteria [closed]

I have seen a friend place an RJ45 connector at the output of RS232Mux on a board he developed and then make another PCB with RJ45 connector and 3 RJ11 connectors so that muxed connection can be ...
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1answer
29 views

Tips and cases to avoid when singals acts like antenna

I want to ask an explaination about when a signal may act like antenna creating EMI, for example with wrong grounding design. I understood that a main ground should be compact without any signal ...
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1answer
52 views

Datasheet assistance request

I'm trying to incorporate a USB-PD controller into my design for a Dual Role Port (DRP). I'm currently building with a Cypress CCG2 24-pin QFN, and using their reference block from the datasheet found ...
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53 views

broken regulator pins

A nooby question: I installed new LDO regulators on the power supply section of a PCB, and one of the pins severed when I bent it down to screw on to the board (two of the others did not sever but ...
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1answer
78 views

Thermal pads under IC, how to place vias without soldermask / Decoupling question

I'm looking for a good solution on how to design a thermal pad that is good for solderpaste assembly. PCB fab that I'm using can't place any soldermask on vias like in this example: And I'm not ...
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1answer
37 views

Placing covered vias routing signals under microcontroller termal pads

Placing covered vias routing signals under microcontroller termal pads is a good practic? I mean to reduce soldered termal pad area to center(connected with vias to gnd) and place covered(with ...
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1answer
30 views

QFN VS MSOP- Which is better for thermal performance

I am having to decide between a MSOP package and a QFN package for a Buck controller that I am designing in. The Part number is LTC3603. The MSOP is called an eMSOP. I cant locate any further ...
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1answer
75 views

This is a good connection for a decoupling cap on an IC?

Since I have no space on the BOT layer to place a cap near IC. I need to place a decoupling cap on the other side of the board, this is a good connection?
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44 views

Tethering a TO-92 IC to a PCB

I need to tether a TO-92 package IC to a PCB - as shown in figure below. The cable length would be less than 50mm. Questions: How can I achieve CONN1 - i.e, attaching a cable (comprising of at ...
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45 views

Steps from schmatics to PCB layout - EAGLE

My question is: What are correct steps to route connections in a 4 layer PCB? in EAGLE. I've designed PCB schematics and switched to board, I've placed all components in strategic positions on top ...
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2answers
63 views

Can a high current trace be on outer and inner layers at the same time?

EDIT, COMMENTS: TL;DR: Data doesn't conclusively suggest you can do this, but it seems to be worth trying. The data from IPC-2152 (more in the answers below) is intriguing, but doesn't seem to ...
2
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3answers
75 views

Can I make a double board at smart prototyping pcb service?

They have a 5x5cm minimum board size. My board is approx. 35x20mm so I can easily put two side-by-side and thus double the board count within this limit. What is the best way to do this? I know how to ...
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1answer
58 views

Altium Designer - split plane

I want to make a plane for my supply on my PCB and a plane for my MCU to isolate the MCU from the power supply noise. I found this article in Altium designer resource: But it isn't clear how the ...
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2answers
1k views

Pronunciation of “Gerber”

How is "Gerber" pronounced? By "gerber" I am referring to the type/class of files generated for PCB manufacturing. I could imagine the first "g" being pronounced with a "g" as in "girl", or a "j" as ...
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1answer
99 views

Altium: PCB routing

I have several questions: I'm not sure how to deal with grounds or Vcc when routing. So I have capacitors/resistors connected to the Vcc of the FPGA, so I connect it directly to the pin. But how do ...
3
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1answer
63 views

Splitting a big Power Trace to several smaller

I would ask if i can layout a big trace and split it into many smaller ones (see attachement) I need to run a trace capable of handling ~5A. But the trace would be too thick to fit between the pins ...
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3answers
67 views

Reduce trace width increase thickness with solder

Im designing a led driver for a friend of mine. The total consumption would be 0.5A (per Meter of led Strip) * 9 Meter = 4.5A, or around 5A. The strips are connected via screw terminals. The problem ...
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139 views

PCB Stackup - Current return path

It is a well known fact that high speed signal would have return current path on the plane right beneath it's PCB trace. Suppose we have 4 layer stackup, SIG-GND-PWR-SIG with dielectrics ...
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33 views

PCB custom - tm4c12333h6pm

Previously, I tried to make a cusotm PCB with a tm4c123gh6pgei (http://electronics.stackexchange.com/questions/176117/tm4c123gh6pgei-custom-pcb) After investigation of that PCB, I was able to ...