Pcb Definition and 84 Threads

For those who have tried getting online quotes from PCB vendors (i.e. for design or fabrication), may I know your feedback from doing this? I personally have not tried sending a request for quote on the PCB vendor's website but I am interested though quite hesistant in this process. I...

Has anyone here have any experience on PCB Design / Fab / Assembly start up? May I know how did it to? What are the considerations? What are the challenges involved?

I'm close to finishing my first 4-layer board. Initially, we felt that keeping the power supply as a separate unit would be better. This was because we wanted to avoid having heat on the main PCB - mostly because the area where the device is intended to be used is very hot and also quite dusty...

Hello, I have a simple populated PCB with passive and active elements. The main chip on PCB is a 8 pin serial EEPROM chip which I am trying to read via PIC microcontroller. Serial chip is tiny and hard to solder wires onto so I can send signals from PIC controller to the chip. I will have...

Hi guys How can we correct week metalization in PCB plating? please help me

To all practicing electrical engineers: Is it part of your job to do PCB design, or are you only responsible for the schematics? A previous company I was with had separate PCB design and EE teams (lumped into HW group). At a different company, some EE's work on the circuit as well as the PCB...

Hello, I am looking for a JTag connector for my PCB. I have 16 pins and the JTag connector needs be throughole that I can solder and about 5 - 1 mm spacing. I have searched throughout the internet and I am not finding anything. Does anyone know of websites that special make these things by...

Can multilayer PCB have different width and/or length layers to create a "shelf"? I am in need of creating a 4 layer PCB stackup, but I need to have one of the PCB different width and length to create a "shelf" so to speak. Has anyone heard of doing such a thing? My layout software doesn't...

I am going to be redesigning some PCBs for some legacy products and want to use the most up to date software I can to keep these designs easy to update in the future. The current design is in Theda and the CAD files are no longer available. I appreciate any input.

Hello, am trying to make pcb at my home, but am not sure about the sequence of fabrication steps. i put the board in UV light for several minutes, then i put it in a basic solution and finally in ana acidic one, but nothing happened to my board... What are the names of bases and acids used for...

Hey All, I am glad to be a part of this Forum. I am brand new to PCB design and I am working on a project related to PCB designing and manufacturing. At present we have free software's available which helps in PCB designing. Can anyone suggest me which is the best software available for...

I have the idea of making a PCB quickturn website that both improves the ordering experience vs the competition, and hugely undercuts them by offering a simplified product. However, I want to gauge interest because the website would need a lot of orders to be profitable (about 10,000 per year)...

Hi everyone: I am new to PCB design, I want to how know often do you use autoroute, or just route the trace manually. Someone tell me that, they route most of the traces automatically and then modify it manually. Thanks

Hello I'm designing a box for 6 PCBs. It will fly on stratospheric balloon. Do you know a solution of mounting PCBs to box walls, which will provide strong and stable connection? I was thinking about slots in internal walls, but that can be not enough. I found interesting solution...

Do any of you guys have a PCB router? Do you know of one for less than $1,000?

Hello, I was wondering if circuit boards today that encorporate shielding do so by covering the entire circuit with a conductor (like faradays cage), or if it can be done by simply coating the backside of the circuit with some conducting layer. Jeffrey Levesque

As part of our project work we have to design a circuit using op-amps on PCB giving reasons why we used the resistors of particular value etc. any suggestions or references?

I'm designing my first SBC which will (hopefully) run Linux. The board will have the following: Features: AT91SAM9XE128 MCU at 180MHz (not in production yet but hopefully soon) 128MB SDRAM 128MB NAND Flash 16MB Serial DataFlash 10/100 Ethernet 33.6 Analog Modem (MultiTech SocketModem)...

To "Stuff" a PCB Hi, Does the phrase to "stuff" a PCB simply mean to take your blank PCB and place the components on their footprints and solder everything on, thereby completing the board? I don't want to sound like an idiot if it actually means something totally different.

Hello. I need to know the mechanism of drilling my printed circuit board (PCB) with two step motors x,y using microcontroller. How to use eagle or orcad to control two step motors to drill and how can the microcontroller accept the eagle file to locate the coordinates of the driller...

Hi, I have a epson c88+ printer, I am trying to modify the Allegro A3977 Microstepping Driver, to move the incoming signal for the stepper motor and send it to 2 additional stepper motor drivers, so that I can run 2 stepper motors off that same signal. I have little experience in this...

Hi, As you know , PCB design tools have manuals accompanying them ,but there are points in designing that a PCB designer earns by long time experiment.Now,are there any places on the web telling us these special points or tricks?

I designed an ethernet circuit, and I am trying to lay it out on the board. The app notes and data sheets specify that the ethernet ground be isolated from the system ground and to be connected through a 0 ohm resistor. There are to be no ground or power planes underneath the magnetics and...

Hi; i want tutorial of pcb design for beginner designers & intermediate PCB designers;I'm using "orcad tool" & "p-cad".

Hello All, I'm working on a PCB layout in ExpressPCB and I am trying to make a footprint for the AD9959 chip. I went to this page here on Analog Devices' page to get a suitible pcb footprint but they don't have any formats that I can import into ExpressPCB...

Hi there! I am thinking about learning to design PCB boards but I only know a little about PCB boards to begin with. So can any of you guys give me some resources that could help me in learning more about PCB design (i.e. using CAD tools). I think that before going about designing the schematic...

hello, how can i import the schematic (.dsn file) from proteus, and use it in orcad? thanks for your answers

Hi, I'm messing around with some stuff in an attempt to make a robot, and I was wondering if anyone could help me with a couple questions I have toward those ends. I'm trying to use an ATmega2560 microcontroller http://www.atmel.com/dyn/resources/prod_documents/doc2549.pdf as the CPU of...

Hey Folks, Can someone please draw me this circuit to a scheme for drawing it on a pcb maker ? I need it urgently, so please help Regards & Respect

Alright, so I made my first PCB using CIRCAD '98. I went through it a couple times, found a couple overlapping traces, but I always miss something. I was wondering if you guys wouldn't mind taking a look at it before I send it off to be printed. PCB...

hi every one i happened to have some junk tape recorders and amplifiers so i set about making myself a deck with a cd drive i have two tweeters two speakers but one sub woofer i want a filter circuit so that i can take the left right inputs and get one bass input for the subwoofer. and...

hello everyone i need a circuit diagram or printed circuit board for a dc to ac inverter that will convert 12vdc to 220v ac @ 50 Hz. the circuit should be preferably simple and easy to make. not to forget cheap i don't want to buy one. i need the car cigarette lighter types that are small. i...

um, this question may really sound not smart but can someone find the property of Polycholrinated Biphenyl for me? i tried chemfinder but i don't get the results of that specific compound so if you can find a link, that will be much appreciated

Dear Group Does anyone have experience with any good freeware for designing PCB? regards eirik