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

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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
77 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 ...
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1answer
86 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 ...
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1answer
52 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 ...
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31 views

Design of ALU use both PTL and adiabatic Logic

Adder module of My 4 bit ALU use 6 Transistor PTL circuit,to reduce power consumption. For further reduction in power consumption can I use 2:1 and 4:1 adibatic mux or there is some kind of ...
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1answer
36 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 ...
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1answer
159 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 ...
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1answer
142 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 ...
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11answers
445 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 ...
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1answer
71 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
43 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 ...
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1answer
68 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 ...
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1answer
67 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 ...
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3answers
165 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 ...
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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 ...
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1answer
45 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
67 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 ...
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3answers
103 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 ...
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1answer
133 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 ...
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52 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
81 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
77 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] : ...
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2answers
92 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 ...
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1answer
102 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 ...
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0answers
30 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
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1answer
130 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 ...
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2answers
68 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 ...
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1answer
40 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 ...
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3answers
140 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 ...
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2answers
136 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 ...
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1answer
60 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 ...
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2answers
289 views

Professor said my embedded system design is incorrect, what did I get wrong?

The problem: Your embedded system has an 8-bit microprocessor, which has a 16-bit address bus. In addition, you have a 32-Kbyte FLASH chip, and a 8 KByte RAM chip. You want to locate the FLASH chip ...
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2answers
93 views

Symmetric power sockets – design considerations in electrical devices

There are various single-phase power socket standards in use. Some countries use plugs that can be plugged in the socket only in a specific orientation (for example, the United Kingdom) while other ...
3
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1answer
72 views

ON/OFF safe implementation

I would like to know what you think about this. Here's a diagram presenting the main modules of the project. Red is 9V unregulated, green is 5V regulated, black is 5V logic exchanges. I want to ...
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1answer
64 views

Radios and Power [closed]

RF newbie here. Lately I've been experimenting with RF. I built some simple oscillators, managing to get a tank circuit working as well as buffering the 1 megahertz output of a tin can oscillator. ...
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0answers
68 views

Good (modern) sources on ARM Cortex hardware design [closed]

I am looking for some good resources on getting started in embedded hardware design with the ARM Cortex series. I'm primarily interested in the Cortex-M, Cortex-A, and Cortex-A50 series of chips. ...
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2answers
75 views

Adding a +15/-15 V chip on a 0-5 V board

General Question: I would like to integrate a specialized chip that requires symmetrical power +15, 0 and -15 V to operate on a 0 V (GND) / +5 V (VCC) board I designed. If possible, I would also like ...
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3answers
218 views

Construct an 8k X 32 ROM using 2k X 8 ROM chips

Construct an 8k X 32 ROM using 2k X 8 ROM chips and any additional required components. Show how the address and data lines of the constructed 8k X 32 ROM are connected to the 2k X 8 chips. I ...
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2answers
77 views

How to “auto-disconnect” from rs485 bus when power off

I have many devices on a RS485 bus. When I disconnect power from one device, the rest of the (powered-on) devices seem to communicate with each other just fine. At least it seems to be working today. ...
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1answer
163 views

Designing a circuit that will reset the proccessor

In the book The Intel Microprocessors Family: Hardware and Software, Principles and Applications chapter 8, page 307, question 30: design a circuit that will reset the processor if a NMI occurs ...
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1answer
111 views

How to reliably and safely recreate a blue smoke monster for a workshop?

First and foremost, I'm going to say that I do and plan to continue to follow all safety best practices for working with electronics. I'm also a relative newbie, so I don't have a lot of experience ...
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1answer
145 views

Which software is used to design this Cirucit?

Could you help me with the name of the software used to design the circuit below? I have used Eagle (Easily Applicable Graphical Layout Editor) but I want to design my circuits with looks something ...
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2answers
54 views

Memory Problems

I've been having some problems with memory ICs, specifically Flash and EEPROM. I've had some experience with the 7400 series for some time...logic gates are pretty straightforward. Input something, ...
3
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1answer
122 views

Sanity check: Using the DS3231 as a clock source for uC

The DS3231 is an RTC chip with an onboard temperature compensated oscillator and 32kHz output. I want to use this chip in a small clock project I'm designing because I've got a couple lying around. ...
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2answers
219 views

13.56MHz RFID Antenna design

I am currently in the process of building an RFID access system for my house + car. I've worked out the software side (I am using an arduino) but am having difficulty with the hardware side. I bought ...
0
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1answer
50 views

Does the WiFi alliance protect the protocol documentation?

I was recently studying the IEEE 802.11 standards for WiFi (pretty dry stuff, huh?) and I was wondering this: Would it be theoretically possible for someone not in the WiFi alliance to develop a chip ...
9
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3answers
601 views

Are there any types of DC motors that self-lock themselves?

I have a small DC gear motor which spools a plastic line. Once I've engaged the motor to tighten the line, I want to lock it in place so that the line doesn't unspool. I would then like it to remain ...
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1answer
63 views

Designing a simple circuit with a Parallel Port and Leds

I am designing a simple circuit to control 80 LEDs using the parallel port. I am a software engineer and I barely remember the basics of hardware design. I already implemented the software to control ...
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0answers
69 views

Virtual Memory, Cache, and TLB's

I recently asked this question over at stackoverflow, but I was told by a user that it was off-topic, so I am posting it here since it's more of a hardware question. I'm trying to study for an exam ...
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1answer
74 views

Electronics Design Challenges/Competitions [closed]

Is anyone aware of some website that keeps an up to date list of running hardware, electronics or electrical design competitions/challenges/contests? I am looking for the types of things that a ...