PCB is the acronym to Printed Circuit Board. A PCB is a carrier for the circuit's components and their electrical connections.

learn more… | top users | synonyms (2)

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Help to identify resistor to remove

I just bought a solar powered LED light that has a motion sensor and a light sensor. When it is dark, it turns on but very dim. When it detects motion, it turns on full power (not very much...) for 20 ...
5
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2answers
270 views

How to measure the impedance of PCB trace

I am working on some front end electronics design working at 200MHz to 1 GHz for my MS project. I have designed the circuit and PCB. Trace width were calculated by simulations. After I given this to ...
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1answer
26 views

Choosing Stepper Motor - Driver Combination

This is my first attempt at designing/building my own circuit and PCB, so please bear with me. I am building a small, portable device that makes use of a small, accurate motor. My goal is to make the ...
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1answer
160 views

Hand soldering QFP component

I recently came across this video on YouTube, in which the guy is soldering a .5 mm QFP component. Hand soldering a .5 mm QFP Chip As I haven't done a lot of soldering in my life (and never used ...
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1answer
19 views

Converting Altium STP/STL model into solidwork

I need my STP/STL model to be re-captured in the 3D workspace environment from Altium to SolidWorks. Can any one help me on this and can it indeed be done? Norman
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2answers
110 views

Displaying names inside pads in Altium

By default net names and pin numbers are displayed inside pads in the pcb editor. Is it possible to have pin names visible instead of just their number? Thanks
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1answer
278 views

Problems involved in going from 0805 to (say) 0402 surface mount?

In order to reduce the size of a PCB I will probably have to use smaller SM components. I currently use mostly 0805 passives, and am thinking about going to 0402 or smaller. Apart from power ...
2
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1answer
44 views

Better Gerber Review Tools

As part of my current workflow producing a PCB layout I open my gerber files using gerbv. This allows me to switch on and off layers and check things are as they should be. However I need to present ...
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0answers
53 views

What signal loss can I expect by routing a 20 dBm 900MHz signal in a 90° curve in a PCB?

I would like to change a PCB to add a (not straight angle) 90° curve in a 900MHz signal path. From my understanding my PCB designer is simply using the correct impedance, routing the signal on the ...
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3answers
2k views

Is 3D printing of PCBs possible?

I just saw this picture about PCB 3D printing on a website, can it work in real life? It's would be so cool, if it could useful in the real life.
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2answers
67 views

ENIG or HASL for prototype with small pitch and expectation to need rework

I have a project where I'm about to order the PCB's for a first prototype, and I'm staring at the option of HASL vs. ENIG on the website. I will hand solder it with an iron, the smallest pitch part is ...
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1answer
41 views

Altium Power Plane Gerber inverted

Good Day I used internal power planes for the first time (Altium), and I now want to generate fabrication outputs in the form of Gerbers. The gerber below illustrates my internal GND plane, to ...
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0answers
43 views

Why are some electronic components glued together on a PCB? [duplicate]

I recently repaired a LCD screen SMPS (by replacing a few caps). I found out that several components are glued together using sort of white glue. I was wondering why it is like that. On the ...
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3answers
77 views

What does “No Pin” mean in IC pinout?

Logically i understand that 'No Pin' literally means that there is no physical pin but i would prefer to hear a conformation of this fact by those who has encountered such situation. The thing is ...
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3answers
69 views

routing of signals

My doubt relates to a routing style of signals. Speed is not the criteria as the signals are not high speed. Kindly refer the image below please - . There are 2 ways to route signals. They are both ...
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2answers
625 views

How to make epoxy blob

I have made a PCB with a few minor mistakes which have been fixed by running wires around my micro on my board. This does not look great and I am hesitant to hand it over to my clients with those ...
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2answers
91 views

How to create isolation slots/gaps in eagle CAD

I'm new to PCB, how to create isolation slots or air gaps in PCB using eagle CAD. Thanks
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1answer
37 views

Capacitors in parallel

I am using a old disposable camera to charge and discharge my Cap. I got 4 Caps and Connected them in Parallel (Hots to hots as is Grounds to Grounds). Can I use this just like normal? Can I just hook ...
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0answers
74 views

PCB isolation strength VS pad-to-pad distance

Is there any estimation regarding the relation between PCB pad to pad distance and isolation strength? If the board is covered with the mask and the minimum distance is 2,9 mm which isolation voltage ...
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3answers
1k views

Replace SOT-23 (5 pin) package in production with wire

I have found a hardware bug on a board design after many PCBs have been manufactured but not populated. I can fix the problem by removing a SOT-23 component and putting a wire across two of the pads. ...
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1answer
64 views

Guide to effecient/neat circuit design (etch and proto PCB)? [closed]

I'm starting to delve into slightly more complex prototyped PCBs and (eventually) will be etching boards. All the guides I've read have been quite basic about the process, but I would like to know if ...
2
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1answer
40 views

Parallel bus trace width and spacing

I have been working on designing a PCB for a Z80 computer that I plan to sell a few times for interested people. The Z80 will work at a maximum of 8 MHz and has parallel lines going to a system ...
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1answer
27 views

Which connector system for serial row of PCB plus cables?

i have a series of PCB modules with signal in and signal out that need to be connected via cables. I want to find a connector system that uses male/female on both PCB as well as cables so i can make ...
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1answer
47 views

ET-3400A soldering questions

I recently got an et-3400a and there is no model for it online, there is one for the et-3400 though, I was wondering what the spots marked AA, AB, ST1, ST2, etc.. do or just the raindrop shaped ...
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1answer
48 views

how do you link components between them on a protoboard [duplicate]

I have the following protoboard (see picture below) Each hole has a distance of 0.5mm I want to link components between them. I found a few ways to do that: 1) Use tiny wires to connect the ...
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4answers
406 views

Placing a mounting hole partially outside the board

I have a board currently 50x30 mm. And I need to have 4 mounting holes on it. Bad news is that I don't have enough space to place them in regular way. Now I made the following thing: I placed four ...
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1answer
60 views

Eagle Cad: How to get copper on both layers for a pin header

I am making a PCB for prototyping, I need solder pads for a male header on the top and bottom layers. In my previous PCB, I had SMD's and pin header pads on the top layer, Its always better to solder ...
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0answers
63 views

Why do PCB traces go back and forth? [duplicate]

Why do traces on PCB's go back and forth? My first thought was it acts as a delay however the length of it should make the delay unnoticeable, if nearly non-existent. Image of example:
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3answers
254 views

Can I route between the copper pads

I have a PCB layout as shown. My question is can I route the PCB between the copper pads? The purple colour is solder mask. From what I know solder mask is the green stuff on a PCB which covers the ...
3
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1answer
53 views

How to represent socketed components in schematic

What method do people generally use to represent socketed components in a schematic, notably in this case I am referring to resistors & capacitors mounted into machined socket pins (multiple into ...
3
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1answer
83 views

Can I ignore the Power up Sequence

I am designing a board where the datasheet suggests a power up sequence. Basically, the VDD_PLL should be turned on first, after 100us, the VAA should be turned on, followed by the internal supply and ...
3
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1answer
294 views

What component is represented by reference designator GT?

I can see that G represents a generator/oscillator, and T represents a Transformer, but what does GT represent?
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1answer
32 views

how to remove dialshock 2 ribbon flex board?

my dualshock 2 has a connector to the ribbon board and looks like this connector can someone tell me the proper way to remove the flex board from this connector while leaving the connector in working ...
6
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2answers
101 views

High Voltage Multilayer PCB

I want to design a four layer PCB, where on the top and second layer are voltage up to 600V present. While I find many information about trace spacing, I don't find anything about isolation between ...
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2answers
122 views

Connecting grounds of DC-DC converter at one point

There have been questions regarding connection of grounds of an isolated DC-DC converter. However I could not find anything that discusses whether the two grounds (when connected) should only be ...
6
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4answers
313 views

Whats the standard for denoting the orientation of an LED on a PCB?

Whats the standard for denoting the orientation of an LED (or diode in general) when printing a PCB? I'm drawing up a design for students to use in a course and want to make sure I'm not misleading ...
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2answers
57 views

Unable to find connector in eagle library

I am designing a PCB in Cadsoft Eagle. I need to connect these type of connectors with 10pin. I searched a little bit on google and found out that these are Molex ...
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1answer
54 views

Small circuit board issue

Background of issue: I have a LED lamp with 2 different modes and an on/off switch for each of these. There is a fan that's supposed to be cooling off the LEDs but is not functioning in 1 of the ...
3
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1answer
54 views

Using both ground pins on uFL connector

I would like to add an Hirose U.FL antenna connector to my PCB. I have no previous experience of using them, so I would like to now if I should connect both of the GND pins to the PCB ground or it's ...
8
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3answers
319 views

Details on PCB layout for microcontroller

Update: the follow-up question shows my take on the resulting PCB layout. I'm laying out my first board with a uC (I've got a reasonable amount of experience in using and programming embedded ...
7
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3answers
343 views

Angles and measurement - PCB design help

I have started doing PCB design from last month and very new to this. I have done tiny bits on eagle cad and Altium cad but still learning things everyday. Now I got a challenging board to do. Though ...
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1answer
44 views

How do I decide which track mode to use for different ampere ratings

There are different tracks in proteus ARES like T15, T40 etc. What is their unit? How do I decide which track mode to use for different ampere ratings?
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1answer
117 views

Extending solder only PCB pins

What is the recommended way to make solid connections to the pins below? Can the soldering be avoided, and if not, what component should be used to provide the plug/unplug connection?
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3answers
122 views

Power glitch when switching between voltage sources

I have I device with USB. When connected to USB it is powered from the USB port (an LDO to adjust from 5V to 3.3V), and when not connected to USB it is powered from a CR2032 battery. Below is the ...
0
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1answer
93 views

Using PCB after short-circuit

So today I opened up my Senseo because I wanted to attach an arduino with a Bluetooth module to the 3 buttons (for some coffee when my alarm goes off). I wanted to measure the voltage but after the ...
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1answer
70 views

Why using A PCB is better than used a bread board or a vero board? [closed]

Why using A PCB is better than used a bread board or a vero board? i want some advantage of this
1
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2answers
64 views

Is there a typical 'ferrite' for use in a PCB?

I have a circuit diagram that I am trying to replicate (actually the Teensy 3.0/3.1 circuit diagram shown here https://www.pjrc.com/teensy/schematic.html) and there is a component called simply ...
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0answers
54 views

Looking for a connector that mates with this battery's connector

I am looking for a surface mount right angle connector that can mate with this battery (FDK America's ML2430-CJ1). I want to use it in a PCB design. Does anyone have any ideas what kind of connector I ...
0
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1answer
32 views

Can someone help to find / create / add a device in Eagle Library?

I want to use FSL176MRT a integrated Pulse Width Modulation (PWM) controller and SenseFET IC in my SMPS's PCB design in EAGLE. It is not available in any library. Its a 6 lead TO-220 package device ...
9
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1answer
506 views

What does this schematic symbol mean (similar to solder bridge)?

this symbol is similar to solder bridge, but there is a connection on both end. what does this symbol mean, and what is the equivalent pcb for this symbol