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$20 USD / hour
Flag of PHILIPPINES
$20 USD / hour
It's currently 3:19 PM here
Joined May 14, 2015
1 Recommendation

Lester S.

@CircuitGenius

4.9 (6 reviews)
4.7
4.7
$20 USD / hour
Flag of PHILIPPINES
$20 USD / hour
100%
Jobs Completed
100%
On Budget
100%
On Time
17%
Repeat Hire Rate

Senior Electronics Design Engineer

Specialties: 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 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
Freelancer Electronics Engineers Philippines

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Portfolio Items

This is a very wide range buck switching mode power supply. It can accept an absolute maximum of 100V input. It can output from 2V to 40V using the trimmer. It can handle maximum current of 3A.
100V Input 2-40V Output SMPS
This is a very wide range buck switching mode power supply. It can accept an absolute maximum of 150V input. It can output from 2V to 40V using the trimmer. It can handle maximum current of 3A.
150V Input 2-40V Output SMPS
Comprehensive report for low power AC-DC with power factor
LED Light Driver with Dimming and CC Functions
This is an AC-DC Lithium Ion Charger with nominal output voltage of 48V and can supply 8A continuous current.
48V 8A AC-DC Li-Ion Charger
Boost Converter Analysis and Equation Derivations

Reviews

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Showing 1 - 5 out of 6 reviews
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5.0
$80.00 USD
CircuitGenius really met ALL my needs. Revisiting him for business was the best thing for me & my team.
Engineering Electronics Matlab and Mathematica Electrical Engineering
+1 more
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Flag of Gregory H. @ghovagim
6 years ago
4.4
$190.00 USD
CircuitGenius was able to make special accommodations for the work I requested and still got the project done within a great window of time.
Engineering Electronics Electrical Engineering PCB Layout Circuit Design
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Flag of Gregory H. @ghovagim
6 years ago
5.0
$194.00 AUD
Courteous, helpful, polite and extremely knowledgeable. Provided design in time frame and assisted with ordering process. Extremely detailed files provided. Highly recommended.
Electronics Electrical Engineering PCB Layout
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Flag of Jacob J. @jacobjarick
6 years ago
5.0
₹12,500.00 INR
Very good service, timely work, will recommend and hire again.
Electronics Electrical Engineering PCB Layout
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Flag of Nikhilesh M. @mnikhilesh
6 years ago
5.0
$230.00 USD
He is quite professional. We communicate very well. We are satisfied with his work and we really appreciate his hard work.
Project Management Electronics Industrial Design Electrical Engineering PCB Layout
J
Flag of Ping J. @jiangpingtj
6 years ago

Experience

Senior Electrical/Electronics Design Engineer

Artesyn Embedded Technologies (Formerly Emerson Network Power)
Jan 2011 - Jun 2016 (5 years, 5 months)
Activities: 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. Switching converters such as buck, boost, buck-boost, flyback, forward, LLC, half bridge etc

Application Engineer

Matlab and Simulink
Aug 2012 - Feb 2013 (6 months, 1 day)
Main function: Simulations and modelling related to control systems.

Hardware Development Engineer (Automotive)

Confidential
Jan 2006 - Jan 2011 (5 years)
• Design smart junction boxes or computer boxes for vehicles from scratch to mass production • Participated in the development of the other new projects starting from RFQ stage to mass production stage as well • Led cost study and cost reduction for the different cross functional teams • Implementing customer requirements and specifications • Design schematic and generate BOM • Performing design analysis such as Worst Case Analysis , Stress Analysis, Monte Carlo Analysis, Fault Tree Analysis , Design Failure Mode and Effects Analysis, Failure Analysis, Reliability Prediction Analysis, Sneak Path Analysis, Thermal Planning and Analysis, circuit simulations, etc • Performing benchmarking activity, design validation, product validation • Led Load Panel designs • Participating in the RFQ and RFI activities and electronic component selection • Extending plant/factory support and answer internal and external issues and concerns • Making engineering documentation which includes data notes, HITS, NM, DFC/PCR/ECO, etc • Making tests specification such as ICT, FCT and EOL for factory used

Education

Electronics Engineering

Cebu Institute of Technology, Philippines 2000 - 2005
(5 years)

Qualifications

Registered Electronics Engineer

PRC
2006
This is a qualifying exam composed of electronics, communications, mathematics and allied sciences. Those who passed will be registered as electronics engineer of the country.

Publications

How to Determine Optocoupler Operation Saturation or Linear

http://electronicsbeliever.com/how-to-determine-optocoupler-operation-saturation-or-linear/
There are several ways on how to determine Optocoupler operation. The old school method is to build an actual circuit and measure the collector-emitter voltage. If the reading is low enough (equal to the saturation voltage of the device) or ideally zero, the Optocoupler is operating at saturation. If the reading is higher than the specified saturation voltage but lower than the collector supply level, the device is operating at linear mode. Another method on how to determine Optocoupler operation is thro

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Certifications

us_eng_1.png US English 1 83%

Top Skills

Electronics 7 Electrical Engineering 6 Engineering 3 Matlab and Mathematica 3 Circuit Design 3

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