World Class Custom Transformers and Inductors
Welcome to Custom Coils, your go-to location for custom transformers and other specialty
magnetic components. Companies all over the world that rely on magnetic components
for their own production have trusted in Custom Coils to deliver the parts they
need since 1967. Custom Coils not only manufactures parts like custom transformers,
it also creates designs specifically to meet the needs of its individual clients.
WHY CUSTOM COILS IS THE BEST CHOICE
- Dependable Source...Built in the U.S.A.
- Solid, Reliable Manufacturing Techniques
- Proven Leader in the Magnetics Industry
- Custom Designed and Built to your Specifications

Our products are manufactured in the United States in our Alcester, South Dakota
headquarters. Since our inception, we have become a proven leader in the magnetic
industry by building a reputation for dependability, for our use of solid, reliable
manufacturing techniques and our willingness to custom design parts and build them
to client specifications. Whether a client needs a custom transformer, DC igniters,
antennas, air coils or beyond, we deliver world-class products with a level of service
that is second to none.
At Custom Coils, our clients are the backbone of our business. To meet their unique
needs, we employ a staff of more than 100 employees to serve 140-plus active accounts.
Ensuring that an outstanding level of service is maintained for all accounts is
priority No. 1. We achieve this by offering personalized service to each customer.
Our engineers build their own samples and customer service is provided directly
by a key manager. Our top management even visits all customers directly to ensure
maximum satisfaction with our products.
When your company needs magnetic components, you’ll find at Custom Coils our
expertise includes such product areas as:
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Power transformers
Our typical custom transformers that fit the power category range from dime size
to large car battery size. Our engineers can create a custom transformer of this
type to meet your exact needs.
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High voltage transformers
Creating custom transformers designed for high voltage is one of our specialties.
Our line is ideal for such formats as low profile, split section, PC mount, high
voltage exit and more.
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Trigger transformers
With growth in the production of lasers and flash lamps, the need for trigger transformers
is on the rise. At Custom Coils, we also specialize in the production of these custom
transformers.
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Switch mode transformers
Electronic applications often call for the use of switch mode transformers. We custom
design and build these to meet client’s specific needs.
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Toroidal transformers
Custom Coils offers more than 40 years experience in the area of designing and building
these high-performing custom transformers.
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DC igniters
We have been involved in winding and building 12V DC igniters for decades. Our igniters
are used worldwide.
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Antennas and air coils
Custom Coils brings more than four decades of experience to the manufacturing of
these specialty parts.
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High current inductors
We offer several series of axial leaded, radial leaded and drum core shaped inductors.
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Hydrogen coils
In addition to custom transformers, we also have the ability to manufacture hydrogen
generator coils.
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When your company needs a custom transformer and other magnetic components, Custom
Coils is ready to deliver. With more than 40 years in the industry, we have become
the trusted go-to location for these parts by companies all over the world.
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