The process of creating electronic products, including components and end-user devices.
-1
votes
2answers
62 views
How is it possible to apply electrical engineering knowledge adequately in such different, variating devices? [on hold]
I realize people do learn it somewhat linearly and progressively, but like the power of a human body in exercising, intelligence or knowledge is not 100% linear. To avoid making this a further ...
0
votes
0answers
42 views
Design General Purpose CORDIC processor for computing sqaure root
My question is if you want to design a general purpose CORDIC processor for computing square root how would you begin with it i mean i know that with CORDIC you can compute angles and stuff but using ...
0
votes
1answer
69 views
Circuit design for DC motor control
I 'm planning to control a DC motor via certain signals. Motor requires 9 V, 700 mA of voltage approximately. The voltage will be provided by a Ni-Cd battery. However, the signals that are responsible ...
1
vote
0answers
23 views
Multiple net names in Altium Designer
We are currently designing a large PCB where multiple engineers are contributing to the
schematic layouts in Altium Designer 13. We decided to use a hierarchical layout for our design so that each ...
5
votes
2answers
226 views
How are microchips designed?
I was just wondering how the microchips are actually designed. I was watching the Apple presentation on the A7 chip and they were saying there is over a billion transistors on the chip. To my mind, it ...
0
votes
1answer
122 views
What do I need to know to design an LED lamp
So I had an idea for an LED lamp. I've got some old flashlights that have older model CREE LEDs.
My idea is that I'd put the LEDs in parallel, alternating polarity so that for each phase of AC, half ...
0
votes
0answers
57 views
How can I size this power electronic circuit?
I have to size a circuit with a 230V AC, 400 Hz, 500 KVA generator, a three-winding transformer and a 12-pulse parallel rectifier; the rectified output will be 270V DC. I've created the schematic of ...
2
votes
1answer
53 views
What is a BFM, what does it do in a simulation?
When we want to test a digital system and verify its working, we just write a testbench and put in some stimulus for a DUT. Basically this would invovle assigning a value to a signal followed by a ...
7
votes
4answers
177 views
Useful mental models for low-frequency analog circuit design?
While learning circuit analysis and design (from Introduction to Circuit Analysis and Design by Tildon H. Glisson ), I caught myself with a thought that experienced circuit designers should have a ...
4
votes
2answers
104 views
Designing yet another BJT amplifier given some constraints
Sorry for asking a question about the same subject as my last question, but I am once again stuck on a BJT Amplifier design problem.
Where the beta parameter may vary from 100 to 800, the voltage ...
7
votes
1answer
114 views
Design a cheap 1.5V / 12V DC motor driver for high school students
I am introducing electric circuits to Grade 9 high school students as part of a dedicated engineering subject. The students have no prior exposure to electric circuits.
As part of this module I want ...
0
votes
1answer
100 views
How to reset a 4026 counter IC when it reaches 6 for electronic dice
I'm trying to build a circuit to simulate a dice roll using a 555 in astable as it's heart. The output pulses are counted by a 4026 and then fed into a 4511 BCD to 7 segment decoder.
It works ...
4
votes
0answers
154 views
What would be the design challenges of making a phone out of detachable blocks? [closed]
A video about a phone concept called Phonebloks has been circulating 'round the web for a while now. It is a phone platform where generic "blocks" are connected via the "base", which is some kind of ...
0
votes
1answer
85 views
How do I determine how much battery and resistance is required to wire a series of LEDs? [duplicate]
I need to wire 5 led's in series with a switch and variable resistor to control brightness.
These I think
I think the circuit will need to look something like this (Ignoring the values the editor ...
2
votes
3answers
92 views
Small Signal RF Amplifer Limitations
Question: I am designing the following common emitter amplifier. This is designed with a BC547B transistor.
My design is as follows:
Vcc = 15V, IC = 30ma, VRe = 2.5 V, VRc = 5V, VCE = 7.5V. HfE = ...
1
vote
2answers
82 views
Toroidal transformers
In regards to the design of toridal transformers is there any specific book that can be referred to?
Can toroidal transformers be built for high power application? I mean can v built a 25 KVA , ...
1
vote
1answer
158 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
429 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
91 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
2answers
203 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 ...
6
votes
4answers
185 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
107 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
102 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 ...
3
votes
1answer
145 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 ...
9
votes
0answers
216 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
170 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
105 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
163 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 ) ...
3
votes
3answers
157 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
55 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
130 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
575 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
159 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, ...
2
votes
2answers
245 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
540 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
96 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
128 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
57 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 ...
9
votes
4answers
280 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
62 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
90 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
154 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
264 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
105 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
111 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
58 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
84 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
137 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
117 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 ...
