Pcb Definition and 86 Threads

I've seen the black epoxy on various pcbs to encapsulate it. I've also seen plenty of times a Clear coating. But this is my first time seeing this yellow stuff? Any idea what it is?

In my project, I have two PCBs, each containing a fuel injector actuation circuit powered by a HRL3024S200P converter. Both PCBs include four injector circuits, which operate continuously. However, the injectors (4) are connected to only one of the boards at any given time, based on a selection...

Hello ,I have built a resonator in CST as shown bellow . I need to make the resonator be in such mode so the H-field will be normal to PCB plane.(W diection in the photo). Surface shows two peaks. As you can see I have peak magnetic field at the edges. Is there some PCB way to excite magnetic...

I had a question in my mind about PCBs. Printed Circuit Board (PCB) is a non-conductive material with conductive lines printed or etched. Electronic components are mounted on the board and the traces connect the components together to form a working circuit or assembly. Now a Pencil has...

We recently ordered a batch of populated PCB. Unfortunately, due to a misunderstanding around the solder mask some gold plated pads that should have been left bare were covered in solder. The PCBs are part of sample holders and the bare pads are used to wire bond (using aluminium wire) to the...

Hello everyone, I am working on a very low cost, small and basic vending machine ($300) with wooden cabinet for small neighborhood stores. As you may know, it is necessary to properly protect the components to prevent users from trying to steal money or damage the components. The PCB has a TFT...

Hello , I was looking into current density analysis of a PCB that handles distribution of AC power . from ansys and cadence sites , i realized by current density they refer to DC IR drop that is a pure ohmic analysis that doesn't take into consideration the AC effects . And in order to take this...

I recently found three old vintage diffusion pumps left over by the previous lab owners: 1. Veeco EP 2A 2. Veeco EP 2A-1 3. Edwards Speedivac F203 Is there a possibility that these pumps have PCB based oil inside? I do not have access to PCB oil testing at the moment. Also any further...

Summary:: I am trying to find some good folks with knowledge in FOGA coding for some ADC boards our EEs are spinning out, but am having terrible luck so far... I am trying to find some good folks with knowledge in FPGA coding for some ADC boards our EEs are spinning out for pulse heigh...

I am interested in measuring the temperature of a PCB via. Since vias are so small, I'm not sure how to go about this. Are there any methods for doing this? If I use a thermocouple, I would need to adhere it to the via wall somehow. Let's just say my via is 0.5 mm? The via would probably be...

I am designing a board which will have relatively high current. The options are to use heavier copper (4 oz), use two layers (2 oz), or 4 layers (1 oz). Are there any benefits to using one configuration over the others?

I understand that PCB trace spacing is typically based on a minimum found in certain standards and that is voltage based. If the breakdown strength of the dielectric is based on e-field intensity, wouldn't it be beneficial to actually consider the material properties and make it based on a...

I am designing a PCB with multiple capacitors on it. I would like to measure the board impedance to compare it with results from Ansys Q3D. I can connect it to an impedance analyzer and easily get the impedance. I have recently thought about other meaningful measurements that I may be able to...

I am looking at using a few 2 kV film box capacitors in series and I'm trying to make the board as compact as reliably possible. Let's say that I have two equal valued series capacitors rated for 2 kV each in series across a 4 kV power supply. Each capacitor will then have a voltage at 2 kV...

I'm trying to maintain a spec requirement of less than 3% drop from farthest pin to closest pin from source. I'used the entire layer for copper but my oart does not require such a large pour accept to handle high current. So I'm considering there's a trade off that should meet inthe middle of...

I have an Allegro .brd file as design reference, but I need something Altium-compatible instead. Altium can import .brd only in case there is Allegro installed on the same PC, what I don't have. Is there anybody who can help me with this?

Hello, I am a beginner but I have a few board design experiences. Now, I want to learn Cadence, but I am confused. Can someone explain the difference between the following software? -Allegro Design Entry L vs. Allegro Design Entry CIS -OrCAD vs. Cadence -Signal Integrity/Sigrity vs. Package...

Well, then: my first real topic here on PF :angel: We will soon do a half-bridge PWM thing, if everything goes smoothly. Bit of a scary thing, actually. So far it's about gathering reference material and examples. Even the simulations are just in planning phase. But: as it seems the...

I’m facing strange phenomenon in voltage multiplier operation – PCB traces are overheating. Multiplier runs at 50KHz, consumes 40V / 26A and delivers 500V / 2A. The prototype is continuously monitored by IR camera due to overheating concern. None of electronic components is heating...

Hi there, we are developing a small consumer electronics product consisting of a small 4-layer PCB along with a few PDM microphones and BLE chip/ and antenna, as well as a LiPo battery. We are locating a small but pretty strong magnet next to these components in the enclosure. It is an N52...

Hi, I am making a half bridge power amplifier that operates at 24 V. The bridge has to supply around 3A current to an inductive load (10mH) The bridge will be controlled using 20kHz PWM from a microcontroller. I have put a ACS712 current sensor in the load path to give feedaback to the...

Homework Statement Homework Equations 3. The Attempt at a Solution [/B] Currently stuck on the question relating to the value of capacitance across X1/Q1 to reduce the voltage to 1 LSB I have calculated the voltage of the 1LSB to be 0.8507 mV ADC Range/Resolution 3.3V/2^12 I have...

So I recently picked up 40 of 10.525 GHz Microwave RADAR transmitters: I opened up one out of curiosity and had something like this (image attached) . I noticed some parts of the PCB aren't even connected to anything. How do the different shapes and sizes of the PCB interact with each-other...

I'm designing a PCB with large exposed metallic pads for an experiment I'm running. The idea is I'll be able to solder directly and repeatedly onto the pads, so ideally the pads should be able to withstand multiple removals of solder. Any thoughts on whether ENIG or bare copper would be...

I need help in selecting best pcb design software out of kicad, eagle and altium. I have to design pcb for my project. But I am having confusion in these software.

I am undertaking a personal project that requires me to etch some circuit boards. This needs to be done on the cheap and in this instance it is not feasible to send to a PCB company. I am a bit put off by the nasty chemicals and the need for correct disposal. I know you can use Vinegar and...

Hi, I am trying out ideas for using Laser prints to transfer image to PCBs which is resist and allows etching the circuit. Here is a small circuit, attached, showing a successful test. This is approximately 20x40mm. You can see the top 2mm aluminium plate has a sheet of silicon, which spreads...

My background is in physics so I have a very basic understanding of circuit design. I was just wondering, If someone were to design a printed circuit board (from scratch) how do they know that it will function the way it should? and also how do they know that the printed circuit board will...

Anyone here used it? http://www.4pcb.com/free-pcb-layout-software/ I have liked Eagle in the past but I see the company I have ordered boards with offers PCB Artist for free. I downloaded it and it looks pretty simple compared to Eagle which is fine with me. It's not like I am laying out a...

Homework Statement So the circuit drawing is in this link http://i.imgur.com/jVYm5La.jpg . Basically, we have to create a power supply circuit and using Livewire and PCB wizard program in conjunction, I created this circuit Homework Equations None? The Attempt at a Solution [/B] I can't...

Hi everyone, I've been trying to design a 12:1 2.0 USB multiplexer for a while, with very little success. I've bought a couple of MAX4999 8:1 multiplexers, trying to use two of them in parallel such as shown in the datasheet. I've put them on a breakout board from Adafruit, and started testing...

Hi ! I am looking for a electric diagram of pcb assembly treadmill drive SERIAL:0004-03052. The name of the treadmill Quinton Clubtrack 510 plus . I have already found Service and User Manual for it but , there nothing specific in it...

I want to use a differential amplifier to separate the digital and analog ground portions of a circuit, but am not confident in my understanding of the datasheet of the amps I have on hand (amp03). http://www.analog.com/media/en/technical-documentation/data-sheets/AMP03.pdf I think that...

Hey guys, I am trying to design an Inductive Square Antenna Coil that will be milled onto my PCB. I am slightly confused when it comes to the matching circuit. To my understanding the matching circuit is there to have the same impedance value of the antenna, correct? So my matching circuit...

Hello I want to make a HMI that monitors i/o through a microcontroller/fpga/something. The problem I've come across is to figure out what's going to interpret/read i/o at the end of this system. For what it's worth, it's going to read i/o from "props" used in so called Escape Rooms - so they...

Hello, I will try and provide as much detail to the problem as I can with the hope someone can help me solve this. We are currently working on a wireless project that contains high electrical currents, because of this the box the electronics are enclosed in experience quite a temperature rise...

Hello, my motherboard recently has stopped working, so I returned it to warrany, they fixed it, but after a few months the board broke again, but unfortunatly the warranty has ran out, so I'm attempting to fix it myself in the freetime :D So I have found a resistor on the motherboard, that looks...

Greetings all. I was wondering if any of you would know how exactly to extract copper chloride (CuCl2) from a solution of used pcb etchant. I know that when you react ferric chloride (the initial etchant) with copper, the products are FeCl2 and CuCl2 dissolved in a dark colored solution but how...

they have different names or something else?

Hi all, can anyone recommend a good software to help in design and simulation of PCB traces, matching circuits, and microstrip lines. Thank you.

Hello, what PCB Design program do you prefer? What's the reason for your choice? I am freshman to PCB design and working on PADS from Mentor Graphics. But I have to admit it seems me a little bit unintuitive and I am unhappy with non-perfectly fitting transmission lines and prolonged editing...

Hi, In my design there are PCB boards. But i am worried the thickness of PCB will not be strong enough to withstand cracking and warp-age when under stress and strain. Is there any formula i can use to calculate vibration on the PCB so i can increase thickness via mechanical ribs...

Hi, I recently designed a PCB in EAGLE, and I got it manufactured and I had all the pieces Sufrace Mounted on it, put it in the oven, everything seems fine and dandy, but I already killed 3 LEDs because of some weird thing going on. I have 5 different LEDs conneced to my circuit, the leds run...

Hi guys, I've just started doing a bit of research in preparation for trying to print and make some DIY circuits. I was just wondering if there are techniques that are favored over others. Also I don't have a massive budget, so price is quite an important factor to me. From what I can find...

In designing a circuit what point should I pick as the ground point? I know it's the reference node in schematic to calculate node voltages and could be anything, but when designing the PCB there should be a physical point that adhere to some conditions as I guess that make it a valid ground...

I am interesting to know about the manufactures of these products: crystalline silicon solar cells, thin-film solar modules, display screens like: Liquid Crystal Display (LCD), touch panel and plasma, thin film rechargeable lithium ion batteries, lithium ion batteries for electric car, fuel...

Im designing a PCB and i need a software that is able to change the size of the components (e.g. the length of the resistor).

Any PCB designers, why oh why oh why do you inflict those (insert profanity) awful fuses that are soldered to the board, fuses in fuse holders make life so much easier.

I have 16 channels of the same circuit shown below. I have positive and negative power supplies ( 15V,-15V, 1A, TI LDOs). Can anybody tell me how to deal with power layout for the OP-AMPs if I use 4-layer (Signal-PWR_GND-Signal) PCB board? Please show me your picture if you have. Thank you!

Dear All I have been recently started to work with Reverse Engineering technology and I would now like to determine a circuit layout diagram of a charge controller from its PCB Layout. Can anyone please help me with this one. I have uploaded the PCB design for your reference. Please...