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

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+50

High EMI PCB track under transistor or diode package

Can a high EMI PCB track under a transistor or diode package (in this case TO247AC) be a problem? To get a better understanding: Is there any advantage on putting these tracks on the other side ...
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1answer
79 views

Low-cost Up-Down Servo solution

I have a small project and I'm interested "upgrading" to a more produce-efficient design. Please note I'm no electrical engineer. I want to move a small servo (like this one ...
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3answers
90 views

Should I use CMOS vs. TTL?

Now, I know that this question has been asked so many times that it seems like I'm trolling, but I must point out that I couldn't find the right answer to this question anywhere. So yeah, CMOS and ...
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1answer
37 views

fpga verilog dual access

I need to write to a register from 2 sources.. in this case, a pci host and a microcontroller. The 2 will never access the register at the same time (basically once the PCI is done , it hands it ...
2
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2answers
69 views

How to design a LIFT simulator using FSM(Finite State Machine)

I want to design a LIFT with the help of Finite state machine. There are four floors. So I took them as 0, 1,2,3 and correspondingly the states. The 0,1,2,3 buttons are present inside the lift. If ...
2
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2answers
96 views

Designing shortwave radio receiver

I was building a receiver circuit ( superhet) for shortwave radio, primarily for 20m ( 14mhz) band. The circuit uses 3N211 or 40673 mosfet for mixer. However I have only these components available at ...
2
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0answers
55 views

Design rule error: Two objects without nets are too close to each other

Can not find where the mistake is. The console output in Ultiboard says: Design rule error: Two objects without nets are too close to each other. Usually, the error is circled in the window, so it is ...
2
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2answers
60 views

Dynamic Logic - Transistor Sizing

If we have a circuit in dynamic logic: What should the size of the charge transistors (Qe and Qp) be? I know that increasing the size improves the speed but also increases the dissipation, and that ...
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2answers
76 views

Designing with ARM SoCs [closed]

I want to learn how to design and develop boards for SoC systems (i.e. i.MX from Freescale). This can be real useful to me because there are countless things I could do with the possibility to design ...
2
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1answer
214 views

Reducing Undershoot and Overshoot in a custom voltage regulator?

I'm trying to build a voltage regulator that takes in a reference voltage and an unregulated voltage (to power the components, and this voltage is always greater than the reference voltage) and ...
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2answers
175 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 ...
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1answer
51 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?
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2answers
76 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 ...
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0answers
87 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
600 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 ...
2
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6answers
117 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
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2answers
191 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
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1answer
49 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 ...
2
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2answers
142 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. ...
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4answers
670 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
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2answers
85 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 ...
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2answers
66 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 ...
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2answers
125 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 ...
3
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3answers
174 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
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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 ...
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1answer
156 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 ...
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2answers
136 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 ...
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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 ...
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2answers
116 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 ...
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2answers
103 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
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1answer
141 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
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1answer
103 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
42 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
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1answer
210 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
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1answer
270 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
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11answers
505 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
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1answer
80 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 ...
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2answers
52 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
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1answer
123 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
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1answer
165 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
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3answers
232 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
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1answer
52 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 ...
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2answers
95 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
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3answers
138 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
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1answer
158 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
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0answers
55 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 ...
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2answers
138 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
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1answer
108 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
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2answers
113 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 ...