The process of creating electronic products, including components and end-user devices.

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6
votes
1answer
638 views

Should I avoid BGA?

I am designing a board and have found that a BGA component is cheaper than the larger footprint. I am curious if I should be reluctant to implement a BGA with regard to extra steps during ...
1
vote
0answers
24 views

how to simulate wide swing cascode current mirror

I want to design a wide swing cascode current mirror (question-left) and in order to apply Iref, I have designed a PTAT and applied it to M3 and M5. Iref must be 50uA and the diagram of output should ...
0
votes
0answers
24 views

Use of hpcompac desktop computer internal speaker for mobile phone audio output [closed]

My hpcompac desktop computer is dead but internal speaker is working I want to use this speaker to listen songs on my mobile phone, any suggestions?
-9
votes
0answers
97 views

Sexism in hardware engineering [closed]

Documentation about sexism in the STEM field (Science, Technology, Engineering and Mathematics) is largely documented and readily available through Google. Furthermore, sexism specific to IT, ...
0
votes
1answer
66 views

Connecting Microcontroller to Higher potential

I am curious how to determine what voltage is acceptable to connect to a micro-controller through a resistor. From the data sheet the highest voltage on a GPIO is 3.8V. So If I have 5 Volts going ...
0
votes
1answer
57 views

static Hazard and challenging questions

i read some notes that wrote: for following Function F, has static Hazard, if B=C=D=1, and for each change in value of A, the Static Hazard 1 can be. Why this statement is True?
3
votes
1answer
52 views

Storage lifetime considerations for electronics

I am working on a single board computer that I am aiming to last for up to 30 years. It will be based on this design, with a lm7805 voltage regulator circuit and address + data line LEDs. I am ...
3
votes
1answer
63 views

SystemC vs HDLs

I am currently involved in a university project to implementing a processor of an existing instruction set. The idea is that by the end of the project I should be able to synthesise this design and ...
0
votes
0answers
36 views

FSB decoupling capacitors and what are their functions

I'm reading the intel core2duo datasheet and it says bellow regarding front side bus. The processor integrates signal termination on the die. In addition, some of the high frequency ...
3
votes
1answer
48 views

For IIR low-pass filters, what design provides the least amount of phase shift in the pass band?

Given all the possible design options for IIR filters one could consider (e.g. Butterworth, Chebychev, inverse Chebychev, elliptic, Bessel, etc.) which design provides the least amount of phase shift ...
0
votes
0answers
34 views

Expandable power supply for multiple components with different power requirements

Suppose an Arduino based project involves multiple sensors and actuators, each with its own power requirements, what are the ways to build single power supply for it ? Further is it possible to make ...
0
votes
1answer
60 views

Modular mixing table with balanced internal bus: is this a proper way to do it? [closed]

TL; DR: Is the schematic below seem like a proper way of building a mixing console with differential internal bus? I always wanted to have a mixing console but I want to do it the maker way: build ...
34
votes
6answers
2k views

How do you document your hardware design decisions?

How do you document your hardware decisions in the design phase? How do you avoid having to ask yourself the following questions while reviewing an hardware design that you made in the past: Why did ...
0
votes
2answers
47 views

Homemade PMOS LDO again, is a few millivolts of oscillation normal?

After I walked through datasheets of different op-amps it turned out that I can live without the NMOS as a driver for the pass transistor, using TL084 op amp (or ...
0
votes
0answers
45 views

Hardware design methodology

I would like someone to explain the three domains in hardware design and the relation between each of them. And how is it used in Hardware design. I tried searching on the internet, but I find ...
-1
votes
2answers
61 views

Design of Op amp given transfer function

i want to create a circuit as a homework with Operational Amplifiers ,Resistors and Capacitors that has a transfer function : Actually i have been given the following ciruit and its transfer ...
1
vote
2answers
49 views

Using FPGA specific hardware components when writing RTL

I have heard at times that someone writing a digital circuit design may want to use actual primitives present on the FPGA directly in the design. This means including the library which contains those ...
0
votes
3answers
142 views

Frequency Detection Circuit Design

I want to create a circuit that can detect audio frequencies and flash RGB LEDs different colors depending on the detected frequency. The frequency range will be from 20 Hz to 12 kHz, after looking at ...
0
votes
1answer
90 views

how to add a 5V USB output to the base of a mass produced custom table lamp to add phone and tablet charging capabilities

Hello I am a lighting designer that just released my first table/desk lamp design. I would like to add a USB charging port to the base, so people can light their desk and charge their phone or tablet. ...
2
votes
1answer
65 views

General Engineering - Organizing Information, Ideas, Projects, Reference Material, Physical Parts etc [closed]

As you work on project and learn new things there is information and things learned that you want to refer to in the future. The commonly used things are not a problem, when used enough you usually ...
0
votes
0answers
58 views

switching of mosfet using IC TL594

Switching of mosfet using IC TL594 I can't find the required circuit diagram switching of the MOSFET using an IC. Is it good to use the PWM method for switching ??
4
votes
5answers
303 views

voltage regulator design flaw in application?

I am a veterinarian and I need some help. I purchased two very expensive lift/weigh table/scales. After about 5 years of service one of them failed. I determined that the main PC board had failed. ...
-1
votes
2answers
94 views

Op amp circuit design

I am having trouble with understanding how to design circuits involving op amps. I need to design a circuit using as less op amps as possible which has the following characteristics: high input ...
1
vote
3answers
334 views

What is the purpose of a resistor on the non-inverting terminal of an Op-Amp Integrator? [duplicate]

I have seen this type of circuit design a few times, but am not sure why it is needed. Considering the schematic below, what is the purpose of resistor R3?
-5
votes
3answers
75 views

Designing a Single Board linux computer [closed]

I'd like to design a single board Linux computer, maybe something ARM-based but I really don't know that much about the hardware side of computers. Does anyone know where I could get some information ...
0
votes
1answer
72 views

My attempt at designing a ripple regulator - will this work?

I am recently getting into electronics design and learning about all this fascinating stuff. I wanted to challenge myself to build a ripple regulator that can take the output from a series of solar ...
14
votes
6answers
2k views

Why implement microcontroller in FPGA?

I am currently "investigating" FPGAs, what they can do, how they do it etc. In more than one place (for example here) I have seen projects that implement a simple microcontroller with FPGA. So my ...
3
votes
1answer
94 views

Are there conventions for representing hierarchical components on a schematic?

Say I'm designing a device with a lot of repeated elements, like an 8-channel audio mixer. Each channel will have functional units that are identical and repeated, for example, an amplifier. To keep ...
0
votes
0answers
27 views

UL ETL IEC certs

I finally got to the stage where I can design some usefull circuits, im starting to get into Power electronics, and im about to start designing my 1st switching mode power supply , and I want to do ...
1
vote
1answer
48 views

Estimating the schematic of a black box using the measured impedance curve

I need to estimate/predict the circuit design of a black box using the measured impedance at the output of this box. The only hint I have is that the circuit inside the box is a demodulator. Is it ...
1
vote
1answer
76 views

Provide power if power is not present already (circuit inside)

I am designing a simple controller for an automotive application. As you can in the schematic below, they system is consisted of a sensor, a gauge and a controller. This particular sensor shorts its ...
0
votes
1answer
64 views

Question about MOSFET CS amplifier simulation

This is the project statement: I have designed the circuit and it worked well. This is the circuit: It contains 3 voltmeters and 1 ammeter as shown. This is a plot for ...
0
votes
1answer
79 views

Copper weight/thickness current capacity

i have been reading about how Copper weight/thickness is important in several areas of PCB design. The thickness and width of a trace determines the amount of current (amps) the trace can carry. The ...
7
votes
3answers
208 views

How to find out if a microprocessor is powerful enough

Everybody knows its easy to develop a proof of concept for an embedded device on a rasbperry pi or even a PC, although when it comes down to choosing a microprocessor for your product, it is difficult ...
-1
votes
1answer
103 views

Microcontroller-based SMPS designing

Is it feasible to construct a variable voltage SMPS using one of each of the following: ATtiny84 microcontroller IRF4905 power PMOS 2N7000 signal NMOS 4.7mF cap 220uF cap AD5280BRUZ100 100kOhm ...
2
votes
3answers
199 views

How to test and rate a home-built low dropout regulator?

I built a low dropout regulator following experiences building a discrete linear regulator. The circuit is simple like this: simulate this circuit – Schematic created using CircuitLab I ...
1
vote
2answers
69 views

Best elements for downhole and high temperature circuits

I want to design a data-logger with PIC MCUs. This data-logger is going to work in chamber in the oil wells in the depth o 500 meters. and it is going to record temperature and pressure for 20 hours. ...
0
votes
0answers
34 views

load cell platform

We are making our own platform for our digital weighing scale using a load cell(maximum capacity of 200kg). We have made something like this but we are unsure if this is the most ideal design ...
1
vote
1answer
59 views

Replace crystal earpiece in bat detector circuit

I've been following the instructions on http://pw1.netcom.com/~t-rex/BatDetector.html which includes the following schematic for a Frequency Division Bat Detector circuit: The instructions clearly ...
1
vote
1answer
69 views

Designing and simulating a common source amplifier circuit

This is the problem: And this is my design for R1 and R2: So, using B2 Spice simulator I made this circuit according to the design: Vin_ and Vout_ are voltmeters. But the problem is that ...
2
votes
1answer
81 views

Buck converter design problem/confusion

I have problem with designing buck converter. I have tried to design it by using instructions from this site: Buck converter And here are my parameters: V input - 72V max V output - 12 V ...
1
vote
1answer
86 views

JK Flipflop design for conveyor project

I have a small project/problem I am working on. While running a conveyor belt continuously with items on it, I need to stamp every other item. I am using a photocell to detect if an item is ...
0
votes
1answer
88 views

PSPICE Simulation of Cascode Amplifier Not Working

Can anyone please tell me why I am getting the following "floating node" errors. I have fiddled around with the resistors to see if it affects anything, so these are not the actual values. I have also ...
1
vote
0answers
134 views

Inverse engineering time

I got this circuit from an automatic lightbulb sensor , it basically turns on whenever the IR sesnsor detects movement, I was able to reverse engineer the entire circuit, however this clever bastards ...
0
votes
0answers
51 views

Common Drain Design Not Meeting Spec

I am trying to design a Common Drain amplifier with specifications below. I have reworked the problem over 10 times now and have not achieved anywhere near an appropriate solution. I have spelled out ...
1
vote
1answer
208 views

Please rip apart my circuit design

I am making an opensource automated wireless window blind controller. It uses a motor to open and close standard metal blinds. Below are links to the project documentation: Full project page ...
1
vote
2answers
101 views

How to make an external PCI adapter that runs on USB3.0?

Motivated by old PCI (NOT PCIe) cards, and laptops without expansion slots, I want to try making a PCI-over-USB 3.0 solution. This is about 70% experimentation, and 30% actual use. Is this viable? I ...
0
votes
3answers
91 views

Enclosing/Casing Design for electronics (electronic eng. vs industrial designer)

I have been wondering, this since i dont have that much experience in product design, but, who is supposed to do the case design of an electronic product? the industrial engineer or the electronic ...
14
votes
4answers
1k views

How do you determine how much flash/RAM you need for a microcontroller?

Let's say you are starting an embedded project with some known functionality. When you select a microcontroller how do you select how much RAM you need? Do you use a developer board and code your ...
0
votes
1answer
46 views

Spread spectrum 400 KHz

I got a 6-phase DC-DC converter. Fsw=400 kHz, synchronization by external clock(CPLD). I need a spread spectrum 400 kHz. What's the best way? All chips what I've seen before worked on MHz and above. ...