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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How multi layer PCB are connected

I've been watching videos how to make PCB at home and I understand the process. But none of them shows how 2 sides are connected, I see on some PCBs there are some circular end points, so it must be ...
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19 views

Eagle Auto Router Display

I've been having difficulty finishing the routing on a PCB I've designed. This is the first time this has happened really. I have miles of free space, yet it only gets to 96.4%. Anyways, I can't find ...
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1answer
28 views

Which IPC standard provides land pattern dimensions?

This answer says it's IPC-7351, but I'm not seeing anything about land pattern dimensions in the table of contents. I'm wanting to make footprints in Altium and I found the IPC Compliant Footprint ...
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56 views

Stripboard without copper tracks?

I bought this stripboard on Ebay. It said "Veroboard" so I had thought it would be with some sort of tracks: http://www.ebay.com/itm/281342062542 Turns out there's copper around the holes but ...
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23 views

Design of Capacitive electrodes using Kicad

I am looking into building a capacitive electrode. I find a lot of research papers available online , however none that tell me how to actually construct the capacitive electrode. Most deal with ...
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1answer
23 views

Eagle tStop pad colliding with other pads

As you can see from the image, the tStop layer is colliding/wildly close with other tStop pad layer. Is that a cause of concern? IC is Linear Technology battery management IC - LTC4155. Package is ...
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50 views

Original motherboard component + redesigned PCB = Well working? [on hold]

Well I bought my laptop about 3 years ago, and I want to replace motherboard. I have a nice Micro-ATX board, but as I know, this desktop motherboard cannot fit in laptop. So I'm planning to figure ...
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1answer
54 views

Modular PCB design in Altium

I need a way to reuse my PCBs that I designed before in my new board as a module. the problem with multichannel design is that I should change some component names in schematic, so I can not use the ...
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2answers
49 views

SMPS transformer orientation with respect to PCB: what's best for EMC?

I have the option of either using a vertical or horizontal bobbin for a flyback SMPS transformer, and I can't conclusively decide which would be best for minimal radiated interference to be picked up ...
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84 views

Twisted pair coil embedded on a PCB

Has anyone tried twisting very thin wires(of order 100 microns) and then sandwiching it in between 2 layers of a multilayer PCB? I have a problem of EMI and looks like twisted pair is the only ...
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2answers
551 views

Can I use LEDs without PCB?

I recently purchased LEDs on ebay that were supposed to come attached to star PCB (as a heat sink). The items I received are just the LEDs (no PCB). They are listed as 3W LEDs, with a forward voltage ...
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3answers
88 views

Removing PCB from complex pattern of soldered-in thru-hole posts?

I have a PCB mounted to a chassis with 16 feedthrus, the feedthrus posts are soldered to plated thru-holes in the PCB. I would like to remove the PCB from the chassis, the problem is that I am unable ...
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35 views

High Voltage AC&DC transition on PCB

I'm designing a SMPS and drawing layout onto double-sided PCB. Due to mechanical features of design, both AC and DC current should have transition through vertically attached board. For example, input ...
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2answers
74 views

Large circuit board options [closed]

I am making a large prototype of a device that requires a large PCB (about 15x20inches). I am able to etch my own circuit board in copper laminates, but I cannot find large enough laminates. Is there ...
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1answer
42 views

DXF to MAX conversion in ORCAD 10.5

I'm trying to convert my board outline .dxf file to .max for Orcad 10.5. I applied exactly the same steps as described in OrCad Help; however, I obtain nothing but an empty page at the end process. If ...
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3answers
380 views

What is the name of a footprint that is designed to let you cut the trace between two nets?

I am designing a board where I want to have the ability to separate the connection between two power net's by cutting a trace. Originally headers were meant to be used but due to size constrains I ...
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2answers
144 views

Designing PCB for fast data

I'm trying to connect multiple components (same components) to an FPGA output. The FPGA runs at 30Mhz and transmitting both a clock and data on lines connected to these similar components. Each ...
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1answer
97 views

Correctly choose circuit decouplers and filters and schematics advice

I want to ask some help to correctly design a power supply circuitry with TPS799 voltage regulators. I've this reference circuitry: And nothing more explainations. I want to use same specifics of ...
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3answers
84 views

How to measure the bonding wire inductance in lab by myself?

Very curious about the IC design. Everytime when we get our chips , we always need to bond wire the chip to connect the PCB. Even though the factory always claims that the bonding wire is 0.8nH/mm for ...
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1answer
73 views

How do I make pads for “spades” on my PCB in Eagle?

I've seen many devices with spade-like connectors (DC Jacks, AV connectors, etc.) such as below: The datasheet for the above connector has the follow pad layout: However, there is no drill hole ...
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2answers
90 views

Stuck in circuit analysis

I am having the following problems understanding the above circuit: -I understand the part where the opto-coupler activates transistor T3 acting as a relay driver. I also understand that this would ...
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0answers
6 views

Arduino Two Ethernet Shields [migrated]

Is it possible to connect two Ethernet shields to arduino? And if yes, how can I distinguish them in the code?
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3answers
131 views

Re-building a Crock-pot controller - how are the heating elements powered?

After a few good years, my CrockPot gave up. It looks to me that there may be something wrong with electronics, and being and Arduino enthusiast, I thought I could re-build it. The symptoms are that ...
3
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1answer
73 views

Can I clean up my board by boil water?

I'm trying to get rid of the flux on my board but it seems I have a problem. this is my board: After soldering two memory under the board(as you can see two memory(a RAM and a Flash)), there is a ...
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1answer
53 views

Running 6 LEDs off 3s (12.6v) and 4s (16.2v) battery

This may be a very simple question but I want to run 6 LEDs on a PCB and I know I can run them simply off a 12.6v 3s battery but if I want to run a 4s battery 16.2 then I will need some sort of ...
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2answers
61 views

Can You Swap Two Capacitors With Different Ratings? [closed]

I've bought a broken receiver recently and I need to swap out a few of the capacitors. the original capacitor is rated at 100v and 0.01uf. The local electronic store sells 100v 3.3uf capacitors. ...
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2answers
57 views

Using a DC Power Analyser properly

In the context of an academic project, I designed a PCB which includes an MCU (EFM32), a GSM module and a GPS module. One of the main target was for the system to be low power. However, now that it is ...
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3answers
107 views

What are these gray boxy components with R50 written on them? (Photo attached)

My motherboard came gradually to a complete death and I'm trying to figure out if one can repair it by fixing some capacitors like in the old days. I went through all the arrays of caps as well as ...
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33 views

Power Inductors in Eagle Software

I want to add the following product into my design in Eagle however I can't find the correct component from the library: ...
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1answer
45 views

Question about a dimension in this IC package drawing

this is the first time I'm making a PCB layout, so I'm not too familiar with datasheets. The picture below shows a diagram for an IC I'm using. The datasheet says all dimensions are in mm. However, ...
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1answer
70 views

RF PCB design: right angles in components?

For RF pcb design, it's common knowledge there shouldn't be any right-angle traces, because capacitance increases in the corner, changing the impedance and causing signal reflections. Less clear (to ...
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2answers
59 views

Wrong behavior li-ion battery charger

I followed this tutorial to build a li-ion battery charger circuit, I made two circuits (the last one better than the first), but any of them works as expected. Schematics (I copied from the page ...
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2answers
43 views

Basic 12v LC Filter for Video noise reduction

I'm very new to electronics and I want to build a basic LC Filter with a 12v regulator and below is my basic schematic. Now i'm sure its incorrect but I want to know why and what i'm missing so I can ...
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1answer
303 views

This is an inductor symbol, right?

This is from the PCB in a microwave oven. On the right side, there are two symbols with the labels DU and OMIF. They look like inductors. Is that correct? sidenote: this is found underneath a relay, ...
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2answers
72 views

Looking for a way to connect Edge card to wire wrap using Eagle

I am working on a project that requires many discrete transistors. Suffice it to say, it is for a transistorized 4-bit CPU project. I came across some oldschool IBM info on Wiki, and would like to ...
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1answer
128 views

Differential pair impedance calculation

I'm having troubles calculating the characteristic impedance of USB/Ethernet traces for a pcb. The Saturn PCB design program calculates values where I'm not sure if they are correct. I want to use a 4 ...
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2answers
60 views

Inkjet Printers+lamp+unused pcb can It work? [closed]

So suppose I have design x Can I print design x inverted onto paper, shine a lamp on it above unused pcb and make a printed pcb? Sorry for my ignorance Cheers!
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54 views

Basic voltage divider issue in my amateur circuit XBee

Once again I need your help in my project. I have a 4,5v powered circuit. I put a voltage divider with 2 resistors in series to reduce my initial voltage of 4.5V to 3.4V (to feed an XBee module). The ...
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1answer
49 views

Hole diameters in PCB software - finished or tool size?

Should I specify the diameter of holes on my PCB as before plating (tool size) or after plating (finished)? Michael Leonard says finished Olimex says tool sizes Pcbex says finished ... Thank you ...
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1answer
71 views

pcb etching: chemical method or milling [closed]

i'am actually intending to install a small pcb production process (100 pieces per day) and i am still hesitating on the etching method: chemical or with a milling machine !! I would prefer a cnc ...
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1answer
45 views

Circuit Track Design in ARES

I want to know how to make the below shown circuit diagram in ARES using a single layer of bottom copper. When I tried it the tracks intersected with one another and I had to add either a jumper or ...
2
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2answers
74 views

Is soldering extra wires to increase current capacity on a pcb trace good design?

I was working on a bunch of PC PSU organ donors and noticed that on lots of them through all the wires that lead the power to the outside there were wires soldered, and lots of solder added. This is ...
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1answer
67 views

Copper weight/thickness current capacity

i have been reading about how Copper weight/thickness is important in several areas of PCB design. The thickness and width of a trace determines the amount of current (amps) the trace can carry. The ...
2
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4answers
201 views

PCB Layout, Functional vs Actual Pin Order

I'd like to continue this conversation here: CAD Schematic pin arrangement approach Basically, there are 2 major ways to do schematic symbols, either with true pin order or by grouping pins by their ...
29
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7answers
2k views

How do I make sure my electronics design is good from manufacturing perspective? [closed]

I am a beginner in electronics design. I have some experience with fairly complex PCB design. I want to design a product that will hopefully sell a lot. How do I ensure that the design is inexpensive ...
4
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2answers
86 views

USB multiplexer - swap pins?

I want to use the USB 2.0 multiplexer TI TS3USB221ARSER. But on the PCB the D+ and D- pins of one connection are crossed (see attached image). Is it okay to change the D+ and D- pins on all sides of ...
0
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0answers
39 views

Can I link Ethernet chips on PCB? [duplicate]

I read up on the Raspberry Pi Compute unit and wanted to link a hand full for networking. Unfortunately, they do not come with native Ethernet, but USB. So I was thinking of linking each compute ...
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2answers
92 views

How to measure the PCB size?

Can somebody share me your methods measuring the PCB size in CAM Software ? In PCB house ,we always measure the size according to the centre of outline and get the final size of the unit board or ...
3
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2answers
90 views

Will forced air on PCB improve current capacity of trace?

If a trace can carry 3A for a temperature rise of 20°C, will adding forced air over the board increase current capability (by any factor)? Is the current limit defined by the heat or is it the ...
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4answers
115 views

routing a 4 layer PCB

I am currently routing a 4 layer PCB and I was wondering how I connect the ground and power planes to the connector and components that need them. Do I simply leave the two planes without routing on ...