PCB is the acronym to Printed Circuit Board. A PCB is a carrier for the circuit's components and their electrical connections.
3
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1answer
94 views
Are these pcb layouts good?
I'm working on an USB audio interface; the board has an analog section, with amplifiers and filters for the input and the output signals, a digital section, with the DAC, ADC, and the microcontroller ...
2
votes
3answers
115 views
Do I need to use thermals on vias for reliability?
This question is further to Why thermal reliefs on vias?
I have recently been advised (by someone I consider an expert) that I should add thermal reliefs to vias which are connected to planes, even ...
0
votes
1answer
33 views
Kicad: How to add a Filled Zone around a Net with a single pin?
I am designing a PCB in Kicad and I need to add a filled zone around a single pin (pin needs to become part of the zone, not an island).
For some reason, when the "Copper Zone" tool provides me with ...
5
votes
2answers
93 views
What is the minimum temperature for FR-4 PCBs?
My company is working on developing a product that will go into commercial freezers, so my boss asked me to provide operating temperature specifications for the product. I can find "operating range" ...
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votes
1answer
65 views
Circuit Diagram Controller [closed]
I want to make a circuit diagram which will:
Read the speed of a servo
Divide the speed of servo
With the result of the division will be controlled the speed of an other motor like this: Servo ...
5
votes
3answers
139 views
Is it better to have a poor top layer copper pour or no copper at all?
For a few small 2 layers boards I'm doing, I'm using the top layer for parts and signals and a ground pour on the bottom layer with no or very short traces, based on comments and answers to my ...
3
votes
1answer
39 views
When using gEDA some components are ignored by the ratsnest. How should this be handled?
I have noticed that when running gsch2pcb to convert a gEDA gschem schematic to a pcb layout that certain components that are properly connected in the schematic are unconnected in the PCB layout. In ...
4
votes
1answer
54 views
Surface Mount vs. PTH Components For Production
I'm a hobbyist who has developed a product which uses ~20 PTH components. The device is essentially an Arduino UNO with some extra driver ICs and LEDs. I have had quite a lot of positive feedback on ...
2
votes
1answer
52 views
JTAG Design for altera cyclone 3
I am designing the JTAG for a Altera Cyclone 3 (EP3C5E144C8N). I was only aiming at normal JTAG, and do not need Active Serial. I have attached the schematic and board in the *.zip file ...
1
vote
4answers
148 views
How do I solder this USB Connector?
I bought this micro usb part: http://www.digikey.com/product-detail/en/10118192-0001LF/609-4613-1-ND/2785378
I need to solder it to a PCB that I designed, but I'm having a ton of trouble figuring out ...
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0answers
47 views
pcb assembly already preroute [closed]
i have a problem with altium designer, i search to create a project with only one pcb and one sheet which brings together pcbs already preroute.
I already create several project and now I want to ...
1
vote
1answer
51 views
how to represent a bridge in eagle pcb schematics?
i'm trying to show that points 7,8,10,11 are connected to ground and point 9 is connected to R18 resistor. but the visuals is misleading. how to create that "jump"
(sorry i don't know the correct ...
3
votes
2answers
72 views
How to use the same switch to control LED and vary resistance?
I am struck with a simple board design problem.
The requirements are : I have a 4 position slide switch according to the position of the slide switch, I should turn on different colored LEDs and also ...
3
votes
5answers
136 views
Elliptical board edges in KiCAD or CircuitPro?
I am trying to use KiCAD to design a PCB which must fit into an existing case. One side of the PCB needs to be shaped as a specific elliptical arc segment. I can figure out the parameters of the ...
2
votes
1answer
48 views
Eagle configure autorouter to solder components (except vias) only on bottom layer of double sided PCB
In double sided PCBs it is difficult to solder through hole components like IC bases, headers, etc. in the top layer. Normally the Eagle autorouter places the solder pads on both sides. That is, in a ...
0
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0answers
32 views
how to add 0.8 mm FPC hotbar soldering in cadsoft Eagle ?
I am designing a connector for my 2.2 LCD which has 0.8mm pitch fpc cable for soldering. I could not find the board for 0.8mm pitch. So I want to design my own. But in eagle the default library has ...
5
votes
1answer
148 views
14 Layers Stack-up proposal
Could be this stack-up correct/appropriate for a 14 layer pcb?
The PCB includes a CPLD at 50 MHz and a Gigabit Ethernet transceiver at 125 MHz. Both mounted in Primary Component Side.
There are 4 ...
3
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1answer
118 views
Disposal of the used acid/hydrogen peroxide etchant?
This thread repeated the question how to dispose the used acid/hydgogen peroxide etchant. So how can I dispose acid/hydrogen peroxide etchant?
Perhaps interesting thread to other readers, Disposal of ...
0
votes
1answer
88 views
STANAG 3350B pcb guidelines
What are the pcb routing standards that I have to follow for routing STANAG video signals on my pcb? Specifically, what are the impedance requirements? Is it better to route as a stripline or ...
2
votes
1answer
67 views
Placing component vertically in ISIS
I am using a large capacitor in one of my circuits and due to space constraints I can't keep it in the vertical position. Does anybody know how I can place it horizontally in the circuit in ISIS?
1
vote
1answer
51 views
Do I have to worry about backwards crosstalk with a 1 way bus?
I'm working on a DDR memory circuit, and I'm not sure how big an issue crosstalk is on the command/address bus. I've designed for crosstalk with the DQ/DQS and CLK lines because they are high ...
0
votes
1answer
36 views
what's the best track size for PCI card and 256 pin QFP chip?
I tried to develope PCB on altium,
what's the best track size for PCI card edge and 256 pin QFP chip ?
Thanks
7
votes
3answers
299 views
Why is the circuit board abreviation for transistor “Q”?
On circuit boards, I see that transistors are "Q", but why Q? Shouldn't "TR" be transformer, so transistor can be "T" because transistors seem to be more common then transformers.
3
votes
1answer
70 views
Circuit Board Abreviations [duplicate]
C stands for capacitor, R stands for Resistor, Q stands for transistor but what are the rest? All of the time I see PCB boards with Components I don't know, and unfamiliar abbreviations on the board. ...
3
votes
3answers
125 views
Mains triac safety circuit design
I am investigating using a triac instead of a relay to control 250V 10A devices.
However all the 600V 16A triacs come in TO-220 packages.
According to AS/NZS 3100 and AS/NZS 60335.1 I need at least ...
6
votes
2answers
127 views
Mains to low voltage seperation between FR4 PCB layers
I cannot find clear information on running mains and low voltage on adjacent layers on FR4 PCBs. I understand how much creepage distance to allow, but for example, can I run - 50Vdc, 240Vac, 0Vac, ...
2
votes
6answers
123 views
Identifying pin numbers from PCB
I have a PCB with documentation. In the documentation, there is referred to specific pins of several jumpers and connectors. On the PCB however, there isn't a label or so for which pin has what ...
4
votes
1answer
18 views
What are these spots on the PCB that are by the mounting holes?
When you look at the board, there is a weird part of the PCB right of the top left mounting hole. There is also another one above the top right mounting hole.
...
3
votes
4answers
156 views
How do I attach a bridge rectifier to a PCB or breadboard?
Newbie question here...I need to know the proper terminology so I know what I'm looking for. I have a bridge rectifier that has four flat blades on the bottom.
I want to throw it on a breadboard to ...
6
votes
2answers
13 views
How can I mount a shield on a breadboard?
The non-standard spacing of the headers on Arduino boards makes it so the shields will not fit on a breadboard
From what I have read, there is no good reason for the non-standard pin spacing on ...
0
votes
0answers
35 views
IBIS model simulation with spice model
I am designing a Data acquisition system with a Texas instruments ADC, Inamps and a ST micro electronics micro controller. I am getting spice models for my inamps, differential amplifiers etc. so that ...
0
votes
1answer
64 views
Protecting fine pitch components from debris
I am making a Battery Management System. However the chips I am using are the LTC-6803-4 chips, and they have a pitch of just 0.5mm. The boards will be placed in a battery box with good ventilation, ...
7
votes
3answers
297 views
Circuit works on breadboard but not PCB
I have a fairly simple circuit that works perfectly on the breadboard, but I am having a lot of trouble transferring it to a PCB. I am seeing very strange behavior which lies outside of my current ...
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vote
2answers
115 views
Do I copper - pour on mains voltage PCB?
I don't have much experience with designing boards for mains voltage. Now I've designed a circuit and I have lots of unused space on the board. Do I fill it with copper our leave it blank? I guess the ...
1
vote
4answers
69 views
Connectors for horizontal and vertical mount
Alright, I will try to formulate this as a non-shopping question... let's hope I can make it so.
I do have a board (which I can still change) which basically has 1 hole in each corner. This board, ...
3
votes
5answers
327 views
Why not reflow a PCB before placing parts?
A standard reflow method for low-volume assembly is:
Method A
Apply solder paste (using stencil or syringe)
Hand-place parts (using vacuum pickup pen or tweezers)
Oven reflow
-
But what happens ...
2
votes
3answers
84 views
What is filmmask?
I am using the Allegro software to layout a board. When working with padstacks, I have four kinds of layers available:
Etch
Soldermask
Pastemask
Filmmask
I know what the first three are. What is ...
4
votes
2answers
23 views
Is it possible to remap the PWM output to other pins?
The Arduino Uno has PWM outputs on pins 11, 10, 9, 6, ...
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2answers
95 views
where to begin learning PC board designing [closed]
can someone please guide the correct path to learn board designing for computers. being specific i am just keen to design a SBC(single board computer) just for hobby purposes my current knowledge is ...
4
votes
6answers
206 views
Identifying piece of circuitry on a PCB
I haven't done electronics for a long time but am doing some for a hobby project this weekend. I'm looking for some help breaking down/analyzing a circuit board I want to modify/hack:
It's for 3 ...
12
votes
3answers
68 views
How do I create a permanent application from something prototyped with Arduino?
Part one of a three part series on transitioning from Arduino to a plain AVR microcontroller and minimum supporting components (part two, part three)
I've built up a project on my Arduino Uno to ...
2
votes
1answer
149 views
Help identifying and finding shematics/datasheets for circuit board
Does someone know what kind of circuit board this is?
(Click to zoom)
I found it in an old cardboard box in the basement yesterday. "Sung Wei 08V0-A" is written at the top.
Where can I find ...
0
votes
2answers
120 views
Resistor and Capacitor Package types Eagle CAD
For a Eagle CAD PCB board design, I am trying to use through-hole capacitors and resistors
I am using C050-035X075 package type capacitors from Eagle CAD library and 0207/10 for Resistors.
Are ...
3
votes
2answers
130 views
Using alligator leads as heat sink for soldering/desoldering PCBs
This is my first question, and I'm pretty new to the world of electronics, although I'm attending an Australian college course called "certificate 3 in electrotechnology".
My guitar tuner seems to ...
6
votes
2answers
178 views
Question about power line on PCB
I am new to designing PCB on eagle, schematic is simple. But making a PCB board is where it gets interesting.
Here's my question to you guys:
I have realized that daisy chaining power supply from ...
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votes
4answers
177 views
Software to design a 2-sided PCB with discrete components [duplicate]
I'm quite new to PCB Fabrication. I have a circuit with discrete components on a breadboard. I would like to fabricate this circuit into a 2-sided PCB containing discrete components. Something like ...
6
votes
5answers
279 views
Home made PCB etching problem
I just tried to make my first PCB at home, but it did not work. I don't know what went wrong, so I'd appreciate some advice.
I was using the photoresist method, so I printed my circuit on a ...
1
vote
1answer
77 views
Disposable Camera Charging Circuit - Will it transfer a maximum amount of energy?
This may sound naive but I would like to build a toy coil gun. I have seen designs where a charging circuit from a disposable camera is used to charge a capacitor. What if I wanted to use more battery ...
10
votes
1answer
213 views
GPS Design Review (RF Input)
I've designed a PCB in Eagle to host a GPS Receiver module and a GPS patch antenna. The RF input to the module is specified as a 50Ω unbalanced (coaxial) RF input. I used this calculator to calculate ...
4
votes
1answer
161 views
Heat Sink for SOT223
I am designing PCB a in which I am placing a BSP296 N-channel MOSFET, for switching solenoids:
MOSFET supply voltage is 24V
MOSFET max power dissipation is 1.8W
Max operating temperature is 150°C.
...
