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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16 views
Proteus - Short pin to ground plane and PCB hole
I am using Proteus 8 to design a PCB using manual routing (not Auto-routing). I included a ground plane using the Zone Mode button. How can I short a single header connector pin to the ground plane?
...
-1
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1answer
64 views
Suggestion on PCB design tools [on hold]
I’ve been using Eagle for designing printed circuit boards for a few months now, and I am reasonably happy with it as a free tool. However, I’m a little annoyed by the low quality of the schematics ...
-3
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0answers
78 views
Why is it so hard to purchase components? [on hold]
Why do companies make it so annoying to buy things from them? Whenever I want to buy something new technology that is not from a distributor, I have to send them an email and wait multiple days as ...
-1
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2answers
68 views
LED Circuit- Beginner seeks help
I am a beginner in electronics and circuits and I decided to make my first circuit. It is an arrangement that spells SPEC with 5mm LED lights. I familiarised myself with the basic concepts (Voltage, ...
5
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3answers
107 views
PCB in circuit tester design
Imagine you want to produce 1k pcs of hardware(mixed signal) per month and you would like to have tester in order to load firmware, calibrate sensors etc.
How do you approach that problem? I see many ...
2
votes
1answer
50 views
What is the antenna gain of a mobile phone?
I'm working on a GSM/3G Project and my team has a small doubt about antenna gain selection.
All along we were using a 3dB PCB Antenna connected via U.FL/IPEX connector.
The antenna does a good job ...
5
votes
2answers
948 views
Where is this LED getting its timing from? [duplicate]
So this little board when connected to 5v and GND start blinking different colors in different orders and with different timing for colors to stay on!
There is nothing on the board other than the LED ...
10
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2answers
144 views
PCB Ground Pour, Crosstalk and antennas
I'm trying to understand the effects of polygon pour fills when high speed line transitions might occur. Consider the fabricated case example below:
In this example the tracks (colored in light ...
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0answers
25 views
Crosstalk in current loops
I'm trying to understand the interaction between two signal lines. The image below shows two planes (left and right) which have connector pins (bold lines). The top signal line is the "driving" line ...
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0answers
28 views
help needed for ublox pcb
I am back to the basic and I want to get I right this time, I am asking to check my prototype of just GPS + patch antenna, I have made a trace of 1 mm width, as I read online about 1.6 mm thickness, ...
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0answers
12 views
What kind of ports are on this PCB? (Kangaroo Pocket PC) [migrated]
| Overview
Please refer to the teardown of the Kangaroo mini PC (below.) I am interested in finding out as much as I can about this board and the ports associated with it. Any details/specifications ...
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2answers
59 views
How do you drill a homemade double sided pcb
I have a PCB that I am prototyping at home and it is double sided.... When I drill on one face the other face peels up a little.
Does any one know how to avoid this problem?
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1answer
51 views
Need help with circuit design. SIM800 GSM [closed]
Im working on a project using an arduino and a SIM800 GSM module, plus a few sensors. The next stage of my project is to design a PCB which has the essential components on it. As Im fairly new to ...
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2answers
239 views
Moisture adsorption on FR4 PCB [closed]
Although the adsorption of moisture by FR4 is quite low, what is the best way to minimize it or eliminate it completely?
5
votes
6answers
2k views
Why are through holes PLATED in PCBs?
As far as I understand, through holes in PCBs are often plated, hence the term PTH. Letting red denote copper, the first figure shows a through hole which is plated, and the second figure shows one ...
5
votes
3answers
338 views
Purpose of perfboards with pads all connected
A while ago I saw a protoboard with the pads all connected; at the time I thought it was a manufacturing glitch, but today I saw another one. I cannot think how these boards may be useful - any ideas?
...
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1answer
67 views
Best way of jumpering high current traces on PCB?
I am designing a 4-layer PCB on which I have a trace that carries around 40A of current. The board will need to be tested at 125C. I need a way to physically disconnect this trace when needed. What's ...
3
votes
1answer
59 views
PCB fab and assembly, how to resolve width problem between adjacent pads?
I have just sent off for some pcbs to be fabricated and assembled, I have used this company before for fab but not assembly with no problems a few times.
They have just sent back a issue I need to ...
3
votes
2answers
315 views
Raise SMD parts offset above PCB
To mount an MPXV7002 pressure sensor (SMT) on a PCB, it has to be raised above the board by about 3 mm to allow the plastic tubing to be attached to the pressure ports. This is an 8-pin device that ...
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1answer
66 views
programming atmega2560 by ISP on self-made PCB
For one of my project, I need an atmega2560.
So I made a PCB with the atmega2560 and ISP headers.
But I can't communicate with the atmega2560
There is also an external 16000Mhz oscillator.
Here is ...
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vote
2answers
88 views
Does A-GPS require a GPS antenna?
I have a good understanding A-GPS functionality. I understand that assisted GPS is used to improve TTFF, works better indoors but costs more as you are using the mobile networks to determine the ...
-3
votes
0answers
27 views
Which PCB Desgin software is better Ares(Proteus) or Eagle [closed]
Which PCB Desgin software is better Ares(Proteus) or Eagle ? Am beginner in PCB ,And need to make home PCB
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2answers
67 views
Altium: Starved Thermal error
I'm getting the following error on all of my GND vias. Internal Plane 1 is my GND plane:
Starved Thermal on Internal Plane 1: Via (11.002mm,23.798mm) Top Layer to Bottom Layer. Blocked 3 out of 4 ...
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2answers
136 views
Voltage Regulator Not Providing Enough Current/Voltage
I am attempting to deliver 9V @ 1.1A to a PCB circuit design using an L7809CV voltage regulator which is rated for 1.5A max.
Using a power supply, I can deliver the required current and voltage to my ...
1
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3answers
56 views
Altium off sheet connector vs net vs ports
I have difficulties to understand what are the differences between a net, a port and a off sheet connector.
I particularly don't understand when to use a port and when to use a off sheet connector ...
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3answers
85 views
Low voltage power “distribution” board design
I got a cheap 12 volts power supply (this one specifically) which I want to distribute to several CMOS CCTV cameras (such as this one) which are spread around the house (15m max. distance).
Normally ...
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2answers
43 views
Altium: how to explode an imported 3D model
I've imported a 3D model of an enclosure and I want to check if my PCB will fit inside the box but I can't "open" the box inside Altium. How can I explode or take a 3D model apart in Altium?
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1answer
76 views
How to make an enclosure for my PCB [closed]
I am thinking of launching a product, and I need to make a nice enclosure. When I asked the Chinese for prices , it was 4500-5000USD for an injection mould. I see tons of Indiegogo projects which sell ...
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2answers
51 views
PCB Trace Impedance - Multiple Layers
I'm in the process of designing an 8 layer PCB with a stackup of:
Signal, GND plane, Signal, Power plane, Power plane, Signal, GND plane, Signal.
For calculating the trace widths necessary for ...
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votes
3answers
61 views
Why do smd components in eagle have padding?
I'm new to eagle and I don't understand why there is a small padding to the left and right of some SMD components (for example the 0402 cap in the image).
Having the physical board in my hand ... ...
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votes
2answers
86 views
How to connect multiple micro-controllers' USB ports on the same PCB?
I'm designing a PCB with 3 Atmel ATmega16U4-AU micro-controllers on it.
I will be programming them through SPI.
Therefore, I will not be using D+ and D- ports on the USB interface. Then how do I ...
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votes
1answer
42 views
How to know the voltages between inductors? [closed]
I've got a schematic as below, but I don't know what voltage is a output.
simulate this circuit – Schematic created using CircuitLab
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2answers
311 views
Non plated through hole to PTH
I have defined Plated through holes on my PCB design.But somehow my pcb manufacturer has drilled it as non plated through hole and PCB has arrived.Now I need a suggestion to convert this non plated ...
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1answer
43 views
Warm/hot starting a GSM/GPS module
I am new to electronics and trying to understand how a "warm/hot start" works.
I am currently working with someone to design a PCB schematic for the SIM928A, a GSM/GPS module. In the hardware design ...
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1answer
34 views
pcb power connector lipo [closed]
I have liPo battery with TAMIYA/TRAXXAS/DEANS/EC3
male adapters. Look at the picture:
But there is no luck to find some compatible pcb surface mount female
connector to power up my board from liPo ...
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votes
1answer
40 views
Battery voltage drops when connected to PCB
I have a circuit containing an atmega328p microcontroller with hc-05 bluetooth module. microcontroller is powered via 7805 regulator. When 7805 is supplied the source voltage by a 9V battery, the ...
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1answer
80 views
I designed a PCB in Fritzing, but forgot to mirror it. How do I fix it?
I designed my first PCB in Fritzing, intending to have it milled at the local hackerspace (they want Gerber files) and then assemble it with THT components.
But now all the copper is on the top side ...
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2answers
36 views
Merge polygon pours in Altium Designer
I need to know if there is a way to merge two or more polygon pours of the same type, in order to have only one. So two objects that become one. Is this possible?
Because anytime I need to redefine a ...
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4answers
376 views
howto align mount holes in 2 pcb the right way?
I'm tring to make some sort of shield board (it's not an arduino):
first board was made in orcad, I have source files gerbers and so on...
I'm making a 2nd board in eagle.
When trying to align the ...
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1answer
45 views
Heatsinking a TO 220 Case
There are modules that I have purchased that are already built on a PCB, and I would like to integrate them into my board. There is a TO-220 case which is a transistor on the bottom side, and it is ...
0
votes
1answer
98 views
Does a motor really need all this circuit to run?
This is the pcb of an Ikea screwdriver, you can see I desoldered the 18650 battery, from B+ and B-, and desoldered the motor from the legs of the switch which is on the other side. So the circuit ...
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1answer
27 views
How to remove pin name from Eagle Device Page? [See Image]
How to remove those pin name from Eagle Device Page?
23
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1answer
966 views
Unusual chemical reaction on PCB (SMPS circuit)
I have a PCB with smps circuit on it 220V to 5V (using Viper22a). Here is the schematic:
And here is the board layout:
In the yellow circle region, I am seeing some sort of white deposition in a ...
1
vote
1answer
46 views
Printing PCBs using conductive paint? [closed]
Has anyone tried to use a programmable cutting machine like a Silhouette CAMEO to cut a stencil for a circuit and then used conductive paint to transfer it to a board?
Could that work? What kind of ...
2
votes
1answer
90 views
Is one big PCB cheaper than multiple smaller ones, if so how to do this in Eagle PCB?
I have heard/read somewhere that one bigger PCB is cheaper than multiple smaller PCBs, is this correct?
If so, then rather than order seperate PCBs for different parts of a project e.g main board ...
2
votes
2answers
80 views
Principles for premature failure analysis of PCB tracks and vias
I have just given a task to implement a setup to detect whether or not a track or via on a PCB is going to fail in any time in the future. The PCBs are supposed to be used in harsh environment e.g. ...
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1answer
54 views
Should vias really have bridges?
I have been always using bridges with vias. I gues that doesnt hurt but recently I though is it really necessary?
I know that they're purpose is for the soldering process to be easier, otherwise ...
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1answer
58 views
How to remove this board to board connector? (Home Theater Amp)
I am trying to revive a months-dead home theater amp/audio unit (Panasonic SA-XR50) that a family member cooked after a move and was not sure what "OVERLOAD" on the front panel meant before it went ...
2
votes
1answer
78 views
Creating a PCB mount RJ45 male plug
I am wondering on how one could build a male RJ45 connector with PCB Mount. I searched and, as I expected, I did not found any existant connector like this. However, I found this interresting item :
...
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1answer
24 views
Create breakout for iM880A-L
I currently need to work with the iM880A-L. As it is annoying and shaky to solder that thing on perfboard and attach cables, I want to create a breakout board with JTAG and SWD plug and pins for all ...
