West Coast Magnetics designs best in class transformers and inductors and provides manufacturing services for electronic products with high engineering content. Our active R&D has resulted in new patented technology and innovative designs for power and RF magnetic components in many applications. We will continually redefine what is possible with magnetic technology. Headquartered in the San Francisco Bay Area, WCM manufactures and designs custom engineered magnetic components, and provides manufacturing services for companies competing in the global OEM space. Our manufacturing facilities are in Stockton, California and in Tecate, Mexico.




Weyman Lundquist/ President

Recognized as one of the leading designers in the field of magnetics, Weyman is dedicated to advancing the technology of power magnetic design. A significant portion of his award-winning work has focused on predicting and reducing winding losses in power inductors and transformers.

In partnership with researchers at the Thayer School of Engineering at Dartmouth, Weyman has helped advance the understanding of power magnetics technology. These discoveries have resulted in improved magnetic devices for the power electronics industry.

Weyman is an active lecturer and instructor as well as an avid sportsman. He holds a BA from Dartmouth with a major in Engineering, MSME from the University of California, Berkeley and an MS Engineering Management from Stanford University.


Sergio Zurita/ Production Engineer

Sergio Zurita is a Manufacturing Engineer with West Coast Magnetics. He has been employed full time since November 2015 at our Stockton, California headquarters and U.S. manufacturing location. West Coast Magnetics designs and manufactures magnetic components used in medical devices, test and measurement equipment, and semiconductor processing equipment. Sergio performs a critical function supporting the manufacturing of our products, including conceiving and implementing changes for the improvement of our operation’s entire production processes. As a native Spanish speaker, Sergio provides a valuable service to our entire organization including the support to our manufacturing facility located in Tecate, Mexico.


David Harizal/ Design Engineer

David Harizal is the Mechanical Design Engineer for WCM’s research and development team. He graduated from UC Davis in June 2016 with a B.S. in Mechanical Engineering. During his time as a student, he studied the various branches of the mechanical world; some of which included structures, circuits, thermodynamics and fluid dynamics. He has over eight years of experience creating 3D ceramic art projects. At West Coast Magnetics, David commits himself to producing designs that will not only meet the needs, but also outweigh the expectations of our customers. He plans to use his technical knowledge gained from school to continuously seek a deeper understanding of magnetic technology through research and experimentation.


Mary Clark/ Research & Development Engineer

As Research & Development Engineer, Mary carefully designs, performs, and analyzes the results of experiments to evaluate new inductors, transformers, and filters. With a B.S. in Physics from UCLA and academic research experience at UCLA’s Basic Plasma Science Facility, she is experienced in experimental physics and theoretical electricity and magnetism. She is a recipient of UCLA’s Dean’s Prize Medal of Excellence in 2016 for her poster presentation on Alfvén waves in a laboratory plasma, as well as a member of the Undergraduate Research Scholars Program for the 2015-2016 year. She is excited to apply her experimental knowledge to advancing new technology in the field of magnetics.


Vivien Yang/ Quality Control Manager

Vivien is a degreed quality professional who has led the company from a basic quality management system to full ISO9001/2008 and ISO14385 certification at both facilities. Vivien is also a vetted designer of transformers and inductors at SMPS frequencies with many successful designs to her credit. Vivien is fluent in Mandarin Chinese and is responsible for international vendor qualification.

Vivien holds a BS in Mechanical Engineering and an MS in Industrial Technology from California State University, Fresno.


Melissa Gonzales/ Sales Manager

Bio coming soon


Elizabeth Menchaca/ Sales Account Representative

Elizabeth has 20 years of experience in sales and customer service. As the leader of WCM’s sales team, Elizabeth works hard to ensure a consistent and high level of service across our customer base. Her key areas of focus is improving responsiveness. Elizabeth is near completion of a 4 year business degree from an accredited college


Joseph Smith/ Sales Account Representative

Bio Coming Soon..


Lisa Reyes/ Production Manager

With more than 20 years of experience building transformers and inductors of all types, Lisa is responsible for leading the production team at WCM. In addition to scheduling and expediting, Lisa is responsible for the Quality System improvements, meet or exceed our quality system goals. Her efforts help us improve productivity, reduce lead time and lower costs.


Toni Jimenez/ Purchasing Manager

With more than 30 years of experience in procurement within the magnetics and passives industry, Toni is our most experienced employee. As the department head, Toni wears many hats; a few of the most important ones include improvements to our MRP system, vendor qualification, and process workflow improvements supporting our Quality Management System.


  • Automated and manual toroidal winding
  • Automated and manual bobbin and coil from winding
  • Soldering and Termination
  • Assembly
  • Potting/impregnation
  • Coating
  • Baking
  • Solid wire, litz wire, copper foil
  • Coils made from bondable wire
  • Tuned RF inductors to +/- 2% tolerance
  • Process validation, risk assessment and PFMEA
  • Rapid prototype services
  • Turnkey assembly, validation, test, packing and shipping
  • Qualified vendors: cable & harnessing, PCB/PCA, chassis, machined parts, injection molding
  • EDI and inventory management
  • Linear, switching power and RF transformers and inductors
  • Frequency: 60Hz to 100 MHz
  • Power (to 100kW):
    Isolation transformers, SMPS transformers, buck/boost inductors, resonant inductors, line reactors, RF transformers, gate drive transformers, current sense transformers
  • RF and filtering:
    Common mode chokes, RF and resonant circuit inductors
  • UL/CSA/VDE/TUV compliance
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