The process of creating electronic products, including components and end-user devices.
1
vote
1answer
110 views
Why make all the PCB GND or VCC?
Recently I saw a PCB that it was all Ground and other Nets were Routed inside that. I found out that in order to do that (In DXP software) you have to do as following:
But the question is what is ...
1
vote
1answer
72 views
Amplitude Modulation Circuit Components
How does one select the values of components used in Amplitude Modulation Circuit (using a Transistor common emitter amplifier circuit)?
The circuit that I designed ends up giving a weird waveform ...
0
votes
1answer
51 views
Electronic Design Book [duplicate]
I'd like to know if there are books about how to design electronic circuits. I have lots of theoretical books that cover how to analyse circuits, but I'd like to read about something more practical, ...
-3
votes
0answers
32 views
What is the optimal way to design `0.25G X 8` RAM And Implementation of RAM units with another Units [closed]
I want to know what is the optimal way to design 0.25G X 8 RAM?
what I thought to do is: (2^30)/4 then we have 28 address, how ...
-2
votes
0answers
36 views
creating a sustainable stack topic [closed]
I want to create a stackexchange topic which helps engineers achieve LEED (Leadership in Energy and Environmental Design) certification for projects. How do I do that?
3
votes
2answers
181 views
Why did the designer use this motor?
I was taking apart this thing that I bought from the dollar store, its this glass block with an encased sculpture that sits on a revolving deck. (see photo below) The deck powers 4 LEDS with ...
-5
votes
0answers
41 views
Reconfigurable circuit for rectifiers/charge pumps [duplicate]
Basically, RFID tag is a passive device. It harvests the energy from RFID reader. So, rectifier is the basic block in the passive tag. Rectifier's dc output voltage is then given to regulator, ...
6
votes
4answers
147 views
Power plug orientation and usability
I was wondering what advantage is gained by modeling a power plug after the lower design. These are American power plugs, and they both exist.
Perhaps the only consumer-based effect gained by using ...
1
vote
1answer
82 views
diference between RTOS and OS? [closed]
I am confused between real time operating systems and normal operating systems(windows etc). and please tell me android is rtos or os.
suggest some good books for it.
1
vote
0answers
73 views
Correct way to define propagation delays in VHDL
I'm currently learning VHDL. As an exercise I decided to implement some of the 7400 series chips. Below is the 74153 and while testing it with ghdl/gtkwave it seems to work.
But I'm sure this ...
2
votes
1answer
64 views
The flyback diode and its applications
So in an application like this:
The coil of the motor will, by Lenz's Law, induce a very large negative voltage across its terminals (without the diode in place). Would this voltage be very ...
5
votes
0answers
114 views
Analyze My Homebrew Diplexer
I'm in need of a diplexer that'll separate RF signals from a single feedline to two antennas. What I designed and built was a diplexer that would allow ~38 Mhz and below out port 1, with ~38 MHz and ...
5
votes
1answer
163 views
Aside from cost, is there any disadvantage to using thicker wire than required?
Say I've calculated the minimum wire gauge necessary to give me an acceptable voltage drop over my length of cable run at the voltage and current my application will use.
Are there any disadvantages ...
2
votes
2answers
78 views
Signal to the audio jack of a smart phone
I have a 3.3 V square wave that consists of groups of 5 pulses at either 12.5 khz and 15.625 khz. Each group of 5 pulses represents either a 1 or a 0. I would like this signal to be passed to a ...
2
votes
2answers
119 views
Square Wave Amplifier - 5VDC -> 13VDC
I want to have a square wave that goes from 0 VDC to 5VDC go through some sort of amplifier and that amplification takes that same wave ( at a frequency of 1200Hz but could also be adjusted later ) ...
2
votes
3answers
101 views
Practical designs/practices for home electronics
I need an automatic voltage stabilizer. I'm thinking about building my own.
I've searched the internet and consulted several books. The diagrams in books show only the bare bones, basic design that ...
1
vote
0answers
37 views
How to use the Free Starter Edition of Sigasi's VHDL IDE
I downloaded sigasis ide for vhdl lastnight and i opened up the tutorial vhdl folder and tried to hit the run button (the green play button im assuming) and i got some menus and i just put some stuff ...
1
vote
2answers
117 views
Can someone please go over my Arduino design?
I've decided to design a custom Arduino in order to learn about EAGLE and electronic design. I referenced Arduino schematics off of various sites so I think my design is good, but I'd appreciate some ...
4
votes
6answers
526 views
Inductors - what are they used for? [closed]
When are inductors really used? I have read that the elements are typically quite hard to implement into circuits given their physical characteristics. I also read that if inductors are placed in ...
1
vote
2answers
99 views
4 input sequence detector
I need to design a 4-input sequence detector and I'm really having trouble with this.
The numbers are entered as a 4 digit input (0010 is 2, 0110 is 6, etc).
The sequence must detect, for instance, ...
1
vote
2answers
92 views
Sawtooth/ramp waves with fixed amplitude from sine or square clock source?
I hope someone can help me out!
A bit of background info:
I have created a DDS based signal generator (Using PIC MCU to drive a AD9833 for DDS output). The generator is capable to produce sine, ...
0
votes
0answers
144 views
How to design 230V to 12V 10A transformer on a 3.2. cm by 5cm core
I am building a 230V to 12V step-down transformer using old cores of Fridge stabilizer. The core size is 3.2 cm by 5 cm.
After reading a web document, I used 26 AWG copper wire for the primary coil. ...
0
votes
2answers
91 views
Design question for GPU
On days I read a very interesting article, saying, that there's exist two general architectures in GPU design: IMR and TBDR architecture's.
One of them used in modern PC-based graphics card GPU's, and ...
2
votes
0answers
114 views
Contact pad size for microprobe coaxial to planar waveguide transition
http://www.ggb.com/t-4.html
Can someone explain what size one should choose at minimum/maximum for the pads and what role the pitch plays (besides impedance matching)? If I order a 100 micron tip ...
-1
votes
1answer
49 views
PJ065A(CUI) based clarification
I need some clarification on the PJ065A DC power jack. It has 3 contacts how do I connect the PJ065A with an LM2675 IC? Which one of the pins (PJ065A) goes to the VIN pin of the LM2675 IC?
0
votes
0answers
56 views
Good books for electrical schematic drawing? [duplicate]
I'm principally a mechanical drafter but recently got hired to do electrical/mechanical drafting at a company. Are there any books or websites that would help me refresh my memory on electrical ...
8
votes
4answers
233 views
Why do I suck at electronics so much? [closed]
I have always been interested in electronic circuits since 3rd
grade when we lit a bulb up. I then always wanted to learn more and more. I'm a soft-more in high-school and it seems like i've it a ...
1
vote
1answer
46 views
NMOS Transistor Voltage Range For Specification?
I have a homework question I'm a little confused about. I was hoping for a point in the right direction. I am given the
\$K_n\prime\$ \$(400 \cdot 10^{-6} A/V^2)\$
and threshold voltage (0.4V) for an ...
2
votes
1answer
88 views
How do I momentarily ground a 3.3V signal (with a pull-up resistor) when power is first applied?
I need to momentarily ground a 3.3V signal that has a pull-up resistor on it when power is first applied.
This is feasible using a microcontroller or a push-button, but is there a "passive" way to ...
1
vote
1answer
109 views
Soldering IC directly to stripboard
I picked up my first "from-scratch" DIY electronics project in a long time, building a 2-tone door bell on stripboard with a basic 555 circuit.
For the most part everything went well. I assembled the ...
8
votes
2answers
258 views
How can I check input of USB?
I have following wire as shown below, one end has male USB connector and other end has four wires. I know, when connected to laptop, the RED one acts as voltage source and BLACK as ground. If I give 2 ...
1
vote
1answer
100 views
How to connect sensor to PC?
I have made a sensor that produces a 4 bit output. I want to perform some logic based on patterns.
I was thinking if somehow I could give that 4 bit input to my computer, I could then write code to ...
3
votes
3answers
105 views
Is it common for internal pull-up resistors to fail? or what would cause them to become intermittent?
I have a board based on an ASIC ARM Cortex-M3 that after months of work suddenly started to report spurious button presses. The ASIC is not our design, but a reputable company's.
The buttons ...
0
votes
1answer
41 views
Post-Transformer RMS Voltage for This Circuit?
I am confused here. For the below circuit:
simulate this circuit – Schematic created using CircuitLab
Ripple voltage is given as 1V peak to peak, Vo = 15V DC. I have assumed a 0.7V drop ...
0
votes
1answer
72 views
Help With Paper Calculation for Peak Rectifier Design Problem
I am tasked with designing a circuit for the following particulars:
A peak rectifier will be used as part of a DC power supply to supply an average DC output voltage of 15V, with maximum +/- 1V ...
2
votes
0answers
113 views
Is this shielded loop antenna balanced?
The antenna is constructed from copper tubing. The circumference of the hoop is less than a tenth of the wavelength of interest. The tubing is closed on all ends, except where it is penetrated with ...
3
votes
4answers
109 views
Software to translate code description to PCB design?
Is there an application available that allows you to define each component and it's connections in a circuit (kind of like Entity Relationship Diagrams in database design), and have the application ...
1
vote
1answer
39 views
Technology mapping
The function given is:
g=ACFG + ADEG + DHJ + BCFI
and i am asked to perform the reconverge theorem on this function which means taking all possible pairs of LUT that share the same input merge them ...
-4
votes
1answer
85 views
Cow tipping robot plans [closed]
Does anyone have plans for a cow tipping robot? Its hard to do by hand so we are thinking a robot would be good. I remember seeing a robot wars or some other show where one bot tried to tip another, ...
0
votes
1answer
87 views
Is it possible to build a CPU from content-addressable memory?
Every modern programming language use objects and not C/C++ style struct/class.
In C/C++ every data member has a size, so addressing a struct member is basically a memory address + offset. But script ...
6
votes
2answers
150 views
How to create a noise budget and what to do with it afterwards?
While reading some questions/answers on this site, I came across this answer from Scott Siedman and I found it interesting.
So, work out your noise budget, figure out how many bits you need, and ...
3
votes
2answers
172 views
Circuit version of a simple if else program
I have written a simple program that controls two motors (outputs) each with two states ( positive, negative) with an Arduino. The motors states based on the status of four buttons (inputs) (Up, Down, ...
18
votes
4answers
925 views
Do engineers still design for volume using discrete through-hole bipolar transistors?
As a hobbyist who likes plugging BJTs and discrete components into solderless breadboard for entertainment and education, I recognise that people like me are an insufficient market to make it ...
2
votes
1answer
71 views
Detached antenna and connecting wire length
Since my this particular question didn't get any answer, I thought of asking a more focused question, along a path which seems a bit more feasible after few tests.
Is it possible to install the ...
0
votes
1answer
104 views
Interactive Art with Wooden Mirrors - How are the pixels controlled?
http://www.youtube.com/watch?v=BZysu9QcceM
This video shows a mirror made up of moving wooden pieces. Please have a look. He achieves different intensity levels by motion of the wooden pieces and ...
2
votes
2answers
2k views
how to select capacitor values
I am trying to find information on formulas used to calculate capacitance required for a given circuit. Not a circuit in particular, just in general how to figure out what value should be used. I know ...
0
votes
1answer
70 views
Questions about RD snubber circuits
I am not too familiar with designing snubber circuits.
Can somebody sanity check the following sizing calculation for a snubber circuit?
Also: Is the undampened rise rime of the voltage due to the ...
0
votes
1answer
33 views
What to change when migrating designs from Altera DE2 to DE2-115?
I'm migrating a working design from Altera DE2 to Altera DE2-115 and I'm running into problems. First everything works with DE2 just like mentioned in the exercises doing what is instructed. Now I ...
0
votes
0answers
49 views
DC circuit breakers in automation plant
I am currently working on designing the power grid of a automation plant. Since i already have a background in automation, the rule of thumb i usually follow is to have circuit breakers in front of ...
2
votes
1answer
144 views
Wireless water level sensor, in sump. Installation best-practices for longivity
My wireless water-level sensor is working fine, and when deployed in the sump-well, it is giving me periodic readings quite well. At this stage, I have the circuit still on a breadboard, and now plan ...
