The process of creating electronic products, including components and end-user devices.
1
vote
2answers
90 views
Current limiting voltage regulator to power 12VDC fans
I'm building a ventilation system that will blow air into the back of our parked SUV. Creating a plastic fan enclosure and installing the fans is no problem, but the electronics... well, that's a ...
0
votes
1answer
29 views
Power analysis after placement and routing of ASIC
How can I procure the files stating the details of power consumption of the chip after PNR in SOC Cadence Encounter?
3
votes
2answers
71 views
How does this shunt regulator work?
I'm investigating battery monitors and I'm looking at TI's BQ76930 to take care of an 8 cell 24V LiIon. They provide the datasheet for their evaluation module (PDF warning) which includes the board ...
1
vote
0answers
79 views
Designing an efficient PSU
I am designing a PSU capable of producing 5 watts @ 5V 1A. The design will power about 12 RGB LEDs (totaling about 400mA @ 5V) and a audio class D 1.4 W amp. Space is no issue but efficiency and cost ...
4
votes
4answers
530 views
Why peltier elements have smaller heatsink on cold side?
I have seen in nearly all configurations that Peltier elements are mounted with huge heat sinks on hot side as compared to tiny ones on small side.
Is this just a way of explaining the need of heat ...
1
vote
5answers
79 views
Heat sink, how much does fin and base width matter?
I have lot of aluminum sheet 0.5mm thickness at home, normally heat sinks that I have seen had 1mm thickness.
Now I am wondering should I get that sheet welded as heatsink or do I absolutely have to ...
4
votes
2answers
183 views
Would a better heat sink be tall or wide?
If we have a heatsink and want to improve it's efficiency would it be better to increase its width or height?
What should be the strategy on installing a fan as well?
If we increase height and ...
0
votes
1answer
42 views
Should same sized peltier elements be cascaded?
I learned that peltier elements give better cooling on cascading but need to be growing in size towards the hot side.
I have 4 peltier elements of 40×40×35mm and I am planning to make a portable ...
-5
votes
0answers
43 views
Digital Electronics / Electronics system design1 [closed]
Q 1: Design binary multiplier that multiplies two 4 bit numbers. Use AND gates and binary adders.
-5
votes
0answers
34 views
Digital Electronics / Electronics system design [closed]
Q 1: show that the dual of the exclusive-OR is equal to its complement ?
2
votes
2answers
122 views
Designing a low voltage UPS
Preface: I am designing a UPS such that if the AC main fail the device can continue to run for at least 10 days. My goal here is to make a design that can last years off a non-rechargeable battery. ...
10
votes
4answers
495 views
Make a custom plastic case
I have worked on many electronic DIY projects like MIDIbox (http://www.ucapps.de/), it always was fun and working but at the end, the problem was that I ended with a cool gear, but in a poor casing, ...
2
votes
2answers
69 views
How to completely turn off device when float switch is open
Background
Below is the circuit I designed to open a solenoid valve after a delay from C2 (represented by L1).
S1 is a float switch which closes when a resevoir goes below a given level. The reason ...
1
vote
2answers
50 views
300W Boost converter design
I am designing a boost converter. I know maybe the specs I want would suit better in another topology like Half-Bridge or Full-Bridge but the boost topology is simpler and inductor winding is simpler ...
1
vote
2answers
107 views
Designing a voltage follower that can provide up to 5A of current to a load
I'm trying to dabble in analog circuit design, but I honestly am a complete newcomer in this area as my strengths are in CS. Sorry if this question sounds stupid, but can anyone help me with designing ...
2
votes
3answers
116 views
Electrical issue with USB ? Hi-speed device not working on own design
Disclaimer, I'm a SW guy, so please don't take anything for granted, and I would appreciate explanations in layman's terms :)
We have a custom design based on ...
3
votes
4answers
502 views
Design vs reality and what to do when they differ
I've been trying to focus a bit more on Analog circuits lately and found that my design and actual results often don't match up exactly. An example is a Pierce oscillator I built a while back, the ...
1
vote
1answer
129 views
Choosing the right transformer for my power supply design
I want to make my own bench power supply. I got a schematic with LM723 and an opamp (LM358) that was designed for 30V @ max. 3A, although by tweaking two resistors and adding extra power transistor I ...
2
votes
2answers
121 views
CPLD: my first project
First, I posted similar question on CPLD/FPGA users forum, however, they do not seem to be as active as StackExchange. So, I hope it will help me to get going with CPLDs and also will be useful ...
19
votes
7answers
2k views
One large microcontroller, or lots of small microcontrollers?
I'm used to doing basic and straightforward things with microcontrollers, relatively speaking. Things such as driving LEDs, running motors, basic routines, GUIs on character LCDs, and so on, but ...
0
votes
2answers
84 views
Value of inductor
I need to wind an inductor with a value between 47uH - 200uH. I have a 10 mm (in diameter) ferrite core from an RF choke used in an old radio (probably lossy ferrite). The core is 3 cm long (I also ...
1
vote
2answers
91 views
Designing effective usage time from 12v car battery
Need a little power design help:
I have a project I'm working on where I have measured that I will use approximately 14.4Ah over 24 hours. This is quite the load for a small timelapse setup where I ...
0
votes
1answer
116 views
PIR motion sensor. How to drive 5 V IC from 3.3v input
I'm trying to get a circuit for PIR motion sensor**. I'll need to use 2 sensor's - first in a single trigger mode and the second one is continuous trigger mode.
** HC-SR501 (datasheet, link goes to ...
0
votes
1answer
77 views
Better device than a LM 298
Building a robot that will run on 12V.
Using four DC motors and basing my design around an older robot that has been around my school for many years. It uses the LM 298 H-bridge for motor control.
I ...
2
votes
1answer
41 views
With a HDL design how/when do we know that we need multi_cycle path, how do we implement it
I understand that we use the multi_cycle path when the delay between launch and latch register shall be more than 1 clock cycle. With a HDL design how can one predict that the combinational logic ...
2
votes
1answer
193 views
How to select a DC-DC converter topology?
I've been simulating a switched mode 12V to 170V boost converter, and it has been quite the learning experience. If my observations are correct, power losses in the circuit not only increase as the ...
1
vote
1answer
185 views
Getting 9V and 400-500mA out of a 24V power supply
I recently bought this power supply to power a microstepping stepper motor controller (which requires an input voltage of 24V).
My project requires the ability to dynamically turn on and off an ...
3
votes
11answers
478 views
Uniformly illuminate an array of LEDs: how to get the most homogeneous output?
Please note: this question refers to the electrical engineering part
of the design, optical configuration is not request (advices are
however welcome)
I'm trying to design a LEDs lamp with ...
0
votes
1answer
78 views
Using smaller ram to make a larger ram unit? [closed]
So far, I figure I need to divide the 2k x 22 RAM's into a 4 parallel connection to get the 3 bits data out, and I assume I'm going to need 3G/2K= 125000 rows of RAM, but I'm not sure out to set up ...
0
votes
2answers
48 views
Voltage sensing
I have a system that needs voltage monitoring.
+12 Volt DC
-48 Volt DC (-54 Vdc)
The ADC chips I can find are limited with input voltage of max 5V.
Are there ADCs capable of doing the higher ...
0
votes
1answer
107 views
zvs induction heater mosfet failure?
Hey guys my name is Barrett I'm an electrical engineering student and I'm new to the forums. I've been super excited to put a zvs induction heater together and I finally got all my parts turned it on ...
0
votes
1answer
109 views
How do I calculate the capacitor value (Farad & Voltage) given the pulse current, pulse duration & maximum tolerable voltage drop?
I have an electronic component with following characteristics:
Operating voltage: 4.5V
Peak operating current: 2000mA for 600uS every 4000uS.
The device can ...
3
votes
3answers
206 views
Maintaining a constant current with varying loads
I've designed a constant current source using a current mirror, we need an output of about 50mA. The problem is that we build it and heat has become a problem.The transistors and the R_load are both ...
1
vote
1answer
36 views
Map n states to hardwired outputs
I'm still new to the world of electronics, so forgive me if the question is too simple.
What I'm trying to do is build a component which takes n wires, of which ...
0
votes
1answer
51 views
Design semiconductor device like CCD
I'm wondering if it is possible for an amateur (I have a physics background but not EE) to
Learn how to design something like the CCD or cMOS or LCD
Learn how to prepare the necessary files for the ...
0
votes
2answers
87 views
stepper motor driver amp
I want to add a few amps to the output of a stepper motor driver (bipolar 4 wire) with out modifying the interns of the driver.
MY QUESTION IS BEFORE I START I WANT TO ASK IF THERE IS A PROBLEM WITH ...
3
votes
3answers
123 views
How is abstraction used in Analogue circuit design?
Digital circuit design is a domain in which we abstract a complex analogue transistor circuit as a logic gate, effectively abstracting away even the electrical nature of the device as we use boolean ...
2
votes
1answer
143 views
Detect Twist-Opened Bottle Cap on Arduino
I'm building a smart bottle cap. Every time it's twist-open it records a long timestamp to local storage. When user opens a smartphone app it syncs data from storage to phone via bluetooth LE. It is ...
0
votes
0answers
54 views
How does a software intruction materialise to hardware action? [duplicate]
Please feel free to rephrase / reinterpret the question.
Rephrased - RM:
How does a program which can be represented by high level language commands or opcodes or a series of 1's and 0's get ...
1
vote
2answers
101 views
Advantages of Isolated DC-DC Converter over non-isolated?
I am trying to understand in what type of situation I will need an isolated DC-DC converter instead of a non-isolated one. What are the design criteria that can lead one to one way or another?
In my ...
2
votes
1answer
98 views
Dot Matrix IC message board [closed]
I'm trying to make a dot matrix message board -type thing work,
The dot matrix IC's are the DL-57 Alpha Numeric Dot Matrix Display [Data Sheet] : ...
4
votes
2answers
110 views
Design for test - What the different ways in which this is done
I know that when we are designing digital circuits we may add porition to it that helps in testing it. This may go beyond merely boundary scan test. What resource can I can use to understand this ...
0
votes
1answer
109 views
Designing an Oscillator
I'm tired of having to resort to Google to find every single oscillator design. I would usually just try to search for a circuit using the same frequency crystal, and try to build that.
Right now, I ...
0
votes
0answers
32 views
Preserve logic in Synopsys DC
I have a design that contains redundant structures and I do not want Synopsys DC to optimize my design logic away, but the tool removes the circuits by default.
How can I ask DC not to remove my ...
4
votes
1answer
168 views
Design criteria for an output LC-filter
When designing an output filter for a simple class-D amplifier I am unsure about sizing the components. Given:
cut off frequency of approximately 50kHz
the inductor DC resistance can be disregarded ...
1
vote
2answers
80 views
Off-board SPI communication issue with ADC128S052
I seem to be having trouble with my board when it is not powered. I have a TI ADC128S02 (datasheet) acting as a slave and communicating with another master board via SPI. There are buffers on the ...
0
votes
1answer
48 views
What are the effects of the different design parameters when building a linear motor?
I am trying to build a so-called "ironless" linear motor. Conceptually, they are quite simple. Linear motors, generally speaking, are just like rotary motors but "unrolled." As I understand it, the ...
3
votes
3answers
151 views
I need a reasonability check for the safety of a home-hacked power supply
I am in the process of building myself a fancy schmancy Raspberry Pi "laptop", and am trying to power it with a single cord/power supply. My strategy is to put together a small project box with 120VAC ...
4
votes
2answers
156 views
Why does this low-cost battery powered device use ferrite beads on the power input?
I have just opened up a small, low-cost motion-activated (by PIR) LED light as I am planning on just using the casing for another project.
The PCB inside is clearly designed to be very cheap. It uses ...
-1
votes
1answer
77 views
what is microcoded architecture in computer architecture
I want to know what is microcoded microarchitecture of an instruction set architecture (ISA) and why is it used? What is the difference between microcoded architecture and single cycle ...
