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Last updated: September 1, 2015
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  1. Vladimir Dementev

    Vladimir Dementev

    Engineer on Refrigerating, cryogenic equipment and air conditioning

    Russia - Portfolio: 4

    Higher technical education by specialty Refrigerating, cryogenic equipment and air conditioning I have experience with AutoCAD, KOMPAS as well as various other software. I engaged in repairing household appliances, performs a various variety of designs and blueprints on autocad. There is main work, looking for part time no more than 10 hours a week

    $7.78 /hr
    0 hours
    0.00
  2. John lester S.

    John lester S.

    Senior Electronic Hardware Design Engineer

    Philippines - Tests: 3 - Portfolio: 12

    More than 10 years of experience in circuit design and product development. Have long time experience in doing electrical and electronic schematics. Experienced in switching converter design such as flayback, boost, buck, forward, ITTF, LLC and others. Have experience in designing low to high power switch mode power supply from proto to mass production. Experienced in LED driver design and LED applications. Capable of doing detailed analysis such as worst case, design failure mode and effects analysis, monte carlo and reliability prediction to come up with a robust and high quality design. Have long experience in implementing customer requirements and designing circuit from scratch that best fit the specifications. Capable of leading people. Summary of Capabilities: 1. AC-DC power supply design, switching and linear, multiple outputs or single, trimmable or fixed 2. DC-DC power supply design 3. Offline AC-DC adapter design 4. Charger design with constant current and constant voltage, AC-DC 5. Charger design with constant current and constant voltage , DC-DC for Li-Ion, Li-Poly, LiFeP04, Lead acid and so on 6. LED lighting related applications, LED drivers (CV/CV) 7. Solar panel energy harvesting and charging systems 8. Switching converters such as buck, boost, buck-boost, flyback, forward, LLC, half bridge etc 9. Amplifiers, filters, switch 10. MCU, DSP and digital circuits 11. Schematic and PCB using eagle 12. Simulations using LTSpice, Matlab, Simulink, Simetrix and Simplis 13. Design analysis and computations using Mathcad 14. Control system design, type 1,2,3 and PID using spice, SISO tool in Matlab or Simulink control design Projects: 1. 750 W AC-DC, efficiency 94% This is a three stage design consisting of power factor correction circuit (boost topology), buck pre-regualtor and main DC-DC (half bridge resonance). The supply has EMI filter on board and passed CE and FCC or ICES emission limits. This supply is compliant to line surge; can withstand 2.6kV and 1.3kV common mode and differential mode voltage spikes. It complies to ESD, EFT, ringwave, dips and interruptions and harmonics and of course conducted and radiated EMI. The design has an auxilliary circuit which is a flyback topology that provides power to the control and houskeeping circuits. The main controllers are digital signal controllers (DSC). Some features includes but not limited to: a) Current sharing, b) Startup short protection, c) Running Short Protection, d) Over voltage protection, e) Under voltage protection, f) Power limit, g) Higher power factor (close to unity), h) holdup of 20msec, i) over current protection, j) over temperature protection, k) output reporting, l) input reporting, m) higher accuracy 2. 500 W AC-DC, efficiency 92% Have the same features as above. This PSU is composed of two stage only; PFC and LLC resonant converter. 3. 360 W AC-DC, 90% efficiency, variable output This power supply has variable output voltage from 14.25V to 16.5V. Two stage design using PFC and LLC resonant converter. All the basic circuits in item number one are in place. All the international standards are also met. This power supply has a convection rating of 220W; meaning it can handle this power without a fan cooling. This is ideal for medical and other fanless applications. 4. 450 W AC-DC, 92% efficiency, multiple outputs This power supply has multiple outputs. It has 12V/21A, 5V/30A, 3.3V/10A and standby of 5V/4A. All the international standards are in place and has all the protections needed as item number 1 above. 5. 50W buck-boost design This is used for e-cigarrete. It can handle continuous 50W with variable output voltage of 1V to 10V. It is powered by a 3.7V rechargeable batttery. 6. AC-DC, 5W charger design with constant current and contant voltage 7. Charging circuit for solar panel applications 8. Lithium Ion Charger 32V input to 24V output with variable charge current 9. Energy saving standby circuit 10. Smart Junction boxes for automotive. This is the one controlling all the body electronics of an automobile. Such as headlights, foglights, wipers, mirrors, heated mirror, fans, etc.

    $30.00 /hr
    11 hours
    4.40
  3. Muhammad Noman Khalid

    Muhammad Noman Khalid

    Content Developer | Math Work | Matlab | C++ | Math Tutor| PCB Design

    Canada - Tests: 3 - Portfolio: 2

    I am studying Electrical Engineering at prestigious institution of my country, Lahore University of Management Sciences (LUMS). I have previously worked on some data generation jobs. I have gained good experience in C++ programming , Matlab and micro controller programming(8051, 8052 Atmel) as a part of my academic projects. Microsoft office is in my expertise. I am motivated, responsive and will deliver work on time.

    $11.11 /hr
    83 hours
    4.95
  4. Angelo D.

    Angelo D.

    3D Mechanical Designer / FEM Analyst

    Chile - Tests: 6 - Portfolio: 10

    I am a mechanical designer, strongly focused on performance analysis and prototype creation. My work experience dates from 2007 I´m a Certified SolidWorks Professional / Instructor / Simulation Analyst. Key Skills: - 3D CAD / 2D CAD - Linear structural Analysis - Non linear structural analysis. - Structural dynamics and rigid body dynamics - Heat Transfer and fluid flow simulation - File management and administration / Tech support provider. - VBA Programmer, can handle SolidWorks API and mix it with Excel API

    $20.00 /hr
    0 hours
    0.00
  5. Anwar A.

    Anwar A.

    Electronics Engineer/Article Writer/Admin Support/Assignment Expert

    Pakistan - Tests: 2 - Portfolio: 6

    I am an Electronics Engineer. I have developed my skills,during my course of study,of programming in Matlab,C,PHP,AS3,HTML,Microwind,Verilog,Simulink,Labview,Latex,Pspice, Article Writing,Report Writing and Web Research.I have also good experience of working with Wordpress,Autoit(desktop applications)and Flash. I have also studied courses related to Technical writing,Communication skills,Project Management,Total Quality Management,Engineering Economy and Ethical and legal dimension.I believe that,having the required skills and knowledge,I can provide my best services to clients.

    $11.11 /hr
    64 hours
    4.79
  6. Dennis Onyango

    Dennis Onyango Agency Contractor

    Mr.

    Kenya - Tests: 1

    I have acquired skills and experience in Electronics Engineering and programming in assembly language as well as a number of high level programming languages such as C/C++, Python and C sharp. I am seeking opportunities utilize my skills in Electronics hardware and software design. I am also well acquainted with windows as well as Microsoft office applications. I can prepare technical designs, mat-lab and circuit-maker simulations as well as write articles research papers, technical user manuals and presentations on various technical and non technical fields.

    Associated with: Dennohxy Budget Solutions

    $5.56 /hr
    0 hours
    5.00
  7. Edgar Mogilnickij

    Structural engineer with masters degree

    Lithuania - Tests: 1

    Structural engineer makes various dwg drawings (plans 2d, 3d, reinforced concrete, wood, steel, nodes), can do all construction calculations. Also making electrical, plumbing, water, solar construction or electric system design. I have experience in construction site as work manager so i always imagine how my designs well be accomplished. feel free to ask for completed works to show.

    $9.00 /hr
    0 hours
    5.00
  8. Rema Pollard

    Rema Pollard

    I am a highly trained student writer attending Stanford

    United States - Tests: 2 - Portfolio: 2

    I am Rema Pollard I am nineteen years old and I atened Stanford University. I need a job to help pay for student funds so I figured online would be the easiest and would best fit my schedule. I am a highly trained writer. I graduated high school with 4.2 gpa.

    $16.67 /hr
    0 hours
    0.00
  9. Mark G.

    Mark G.

    Mechanical and Process Engineering

    Croatia - Tests: 3 - Portfolio: 20

    We are constructing and designing process equipment according to AD2000, EN 13445, EN 12953, ASME codes and PED97/23/EC, such as: - Steam boilers - Heat exchangers - LPG tanks - other vessels and containers working under high pressure and temperature - atmospheric vessels and containers - storage tanks we can provide: - strenght calculations - technical data and manufacturing drawings - construction approvals from notified body

    $20.00 /hr
    0 hours
    0.00
  10. Matthew Day

    Matthew Day

    Matthew Day

    United Kingdom - Tests: 1

    I have gained over 20 years experience in the banking industry where I held many roles mainly in operations support writing documents pertaining to contingency and disaster management. I also held jobs in project management and business analysis as well as operational management. I have advanced mathematical and data analysis skills that I am putting to good use whilst studying for my degree in Maths and Physics as a mature student.

    $15.00 /hr
    0 hours
    0.00