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

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1answer
71 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. ...
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0answers
44 views

What careers do the workers at a computer part manufactring (or design) company have? [on hold]

What's the profession/career of people who design and are in charge of manufacturing CPUs, DRAM memory modules, hard disks, motherboards and other digital computer parts and what's their role in the ...
2
votes
1answer
60 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
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0answers
40 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
297 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. ...
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2answers
84 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 ...
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3answers
295 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?
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votes
3answers
58 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
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1answer
52 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
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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 ...
-1
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0answers
39 views

Designing an inverting amplifier with a given gain, open loop gain and gain bandwidth product

How do I design an inverting amplifier with a given gain, open loop gain and gain bandwidth product? For example 12dB gain, 86dB open loop gain and a GBP of 500kHz? Using the gain formula I can ...
3
votes
1answer
85 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 ...
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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 ...
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0answers
9 views

Where to post a Fluid Power Systems/Mechatronic Engineering question [migrated]

Which StackExchange forum would be the best to post on? There doesn't seem to be a general Engineering forum and most of the Engineering forums that are there are [closed].
1
vote
1answer
45 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
67 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
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1answer
52 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
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1answer
68 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 ...
6
votes
3answers
203 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 ...
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1answer
81 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
145 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
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2answers
66 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. ...
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0answers
26 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
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1answer
53 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
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1answer
61 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
72 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
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1answer
70 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
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1answer
65 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
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0answers
131 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
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0answers
45 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
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1answer
168 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 ...
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2answers
80 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
85 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
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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. ...
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0answers
51 views

Design considerations for internal PC parts

I'm designing a PWM fan controller. It will be interally mounted inside a PC and will take power from the normal 4 pin Mate-N-Lock ("molex") connector. The on-board MCU and LCD will draw power from ...
0
votes
1answer
79 views

Pogo Pins for 1.5mm Pitch Test Fixture

I'm working on a design and am going to source a smaller pcb and solder it to my design. Before using the sourced board I'm wanting to test it and so I'm trying to design a test fixture similar in ...
0
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0answers
54 views

How can an ASIP design be implemented in hardware at low cost?

Imagine, I have created an ASIP (Application-specific instruction-set processors) design in the IDE, have done the tests and in simulation, it works well. Now I want to test it in hardware. But it ...
0
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2answers
100 views

Looking for a huge circuit compilation [closed]

I have noticed that during my circuit design i always end up finding around the net better ways to improve my designs pic related its an example, Its a fuse blown indicator that gets improved by ...
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0answers
37 views

Can I power a IOIO-OTG board with the regulator on a Koala Protoboard?

I'm building a small device which uses a IOIO-OTG board. I figured I would mount my components on a Koala Protoboard along with the IOIO to use the recharging/usb regulator circuit provided on the ...
0
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0answers
104 views

Design a Mealy FSM that functions as a sequence detector, generating two outputs y, z in the following way:

Initially both inputs are set to 0. Output y is set to 1 when the sequence "10" has been applied to the input x; output y should then be reset to 0 and y should continue detecting next occurrence of ...
2
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0answers
93 views

How to learn circuit design if I already know some circuit theory [closed]

I'm a recently graduated electrical engineer, but my curriculum never focused on electronics, besides the standard introductory level courses. I specialized in telecommunications and I mostly work on ...
0
votes
1answer
59 views

Implementing F using a demultiplexer and an extra AND gate

Use a 1-to-8 Demultiplexer and an extra AND gate to create the function: F(x,y,z) = ∑m(1,3,5) If I were using an OR gate I think this would be trivial, simply put the 1 3 and 5 ...
4
votes
2answers
180 views

How does someone initially design a digital system for HDL?

So I have really been hitting the example code hard this week in an attempt to better understand some HDL design basics, specifically FPGAs with VHDL. The book I am using (if anyone is interested) is ...
0
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0answers
90 views

Tango PCB Designer

i'm trying to run the old Tango PCB on a DOSBox, on windows 8.1. I did the same things to make it run that i did on windows 7, but it's not working on windows 8.1, have anyone tried to run Tango on ...
2
votes
1answer
99 views

I'd like to improve this design to support ICSP

I'm new to electronics and this is my first circuit. I have some questions about implementing ICSP in this design. This is a bit of a long post with quite a few questions so I'll apologize in ...
1
vote
2answers
59 views

Karnaugh map: mirroring tables

When creating a map for n variables, we have to do (n-1) mirrorings. I wonder, why are the variables assigned in the way you see it on the picture. How do I know, when expanding a map, where to place ...
0
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1answer
70 views

Switching power supply using faraday cage and EMI protection?

Several switching power supplies in the market use this kind of cages to protect the circuit, however, i have this question, A) Is this used as a faraday cage due to the high frequency used by it? ...
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2answers
62 views

Smartphone headset jack to relay [closed]

Looking to see if anyone has seen a relay triggered by a sound file played thru the phones headset. My idea is to connect an old smartphone to my home's WiFi and then connect it to my garage door ...
2
votes
1answer
57 views

Automatic cut off after switch is pressed

I have a fun one for you. Here is my diagram: It's a 555 timer in a monostable one shot configuration. What I want to do is find a way to prevent the LED from staying on if the switch is held down. ...