• 1201 West Randolph St., McLeansboro, IL, USA

STC, Inc. - Social Media

STC Ribbon Cutting - 1989

Calkin’s 30-Year Milestone

“When I think about the biggest moments of my career at STC,” says Angie Calkin, “I would probably say the Nighthawk production line, our becoming ISO 9001 certified, and then my promotion to Vice President of Operations.”

Angie has seen many changes during her 30 years at STC, but these moments mark three significant shifts in her mind.

The Nighthawk production line fulfilled orders for transformers used in the Nighthawk brand of carbon monoxide detectors. At that point in the 1990s, the Nighthawk orders were the largest ever placed with STC.

“At that time, I was involved with Testing, Quality, and Electronics Production. Then I became Project Manager for the Nighthawk line—which shipped between 2,000 and 4,000 transformers per day. That is a lot compared to what we had been producing. We had three shifts running to meet the orders. We purchased new winding equipment. We hired new employees, so we were interviewing, hiring, and training. It was both very exciting and stressful.”

At the time, Angie felt she lacked the experience for the wide range of abilities the job required, but she learned quickly.

“You can imagine the complexity to ship that many parts each day, from having the material in place, to handling employee issues, to dealing with machine breakdowns, and then the logistics for shipping, Angie says with a laugh. “I can’t tell you how many times [husband] Jim and I made the 40-mile trip to the shipping center to drop off additional parts to be shipped.”

STC Ribbon Cutting - 1989
STC Ribbon Cutting, 1989

Angie started at STC as a production worker alternating between Electronics assembly and Magnetics (transformers). In 1989, STC moved across town to its current location. The move took a couple of months to complete, and Angie was the first one to relocate to the much larger facility. As a result, she worked alone for a month or two until the move was complete.

“Quality testing was an ongoing part of my responsibilities, but it got to the point there were projects we knew we couldn’t bid because we weren’t ISO certified,” Angie says. “We worked hard to become ISO 9001 certified. In addition to many other tasks, we wrote Procedure and Quality manuals, which we update as needed to maintain our ISO certification.”

After 18 years at STC, Angie was promoted to Vice President of Operations, and there was no question about the first priority to be addressed in her new position.

“I know when I took over, we were way behind on our production schedule, and it was a real challenge to catch up on,” says Angie. “It was at that point that I started communicating more frequently with customers—and you learn a lot of important things doing that. I started interacting with so many facets of our customer’s businesses, so you learn much more about what they require and why they require it.

Angie is pleased with the current state of STC.

“I think the company’s done well. I credit [STC President] Brad Cross for that, his leadership. The work we do now is a lot more high reliability, and it’s taken time to build up to that.”

When asked about Angie’s contributions to STC, Cross is quick to point out the benefits gained from her hard work and eye for detail.

“Angie’s high standards for order execution and quality impacts our entire organization.”

Thanks for your hard work and leadership during your time at STC Angie—and best wishes for the next 30 years!

Read More
Les Vaughn at Work Designing a Transformer

Vaughn Reflects on 30 Years at STC

During the year 2018, three STC employees celebrate their 30-year anniversary with the company. Design Engineer Les Vaughn marks his anniversary today, and it also offers a chance for him to reflect on some of the many memories of his time at STC.

Vaughn works primarily in Magnetics and has designed several hundred transformers for STC customers. His transformer designs can be found in everything from large and small aircraft, broadcast towers, military equipment, medical devices, manufacturing machinery, common household appliances, and much more.

When Les started at STC, his first role was in testing.

“At that time, testing involved hooking up leads and checking meters—rather than using the advanced automated testing equipment we have now,” Vaughn says. “I worked closely with the plant manager at that time, Bob Simpson, who was very helpful, and I eventually transitioned over time to design engineering.”

Les was certainly qualified for that role, in both education and work experience. Prior to starting at STC, Les worked for about 12 years in broadcast engineering, and with a combination of electronics and mechanical work during a short stint at a printing press in Mt. Vernon, Illinois.

Transformer Design Engineer at Work
Les Vaughn in His Office Designing an Innovative New Transformer, circa 1993

“Some of my favorite types of magnetics projects are those for high-voltage transformers,” Vaughn says. “One project we did for a university was for a kind of high-voltage plasma application. Those projects are fun because you get a chance to be involved with cutting-edge technology—and, of course, you need to test those designs to see how big of an arc it will put out,” Vaughn adds with a laugh.

“We have a lot of experience, and our manufacturing capabilities really work to our advantage. Those things make a big difference when it comes to high-voltage transformers, not to mention instrument transformers, autotransformers, three-phase transformers. You get the idea.”

STC President Brad Cross also appreciates Vaughn’s expertise.

“Les is interested in technology, not only as a profession, but as an avocation or hobby, which is really beneficial.” Cross says. “He cares about his customers and finding the right solutions to fit their needs.

“Because of his expertise, he’s able to steer customers toward a design that not only meets their requirements, but is also economical and available within a reasonable amount of time. He’s a tremendous resource from that perspective too.”

Thanks for offering your expertise to those of us at STC and to our customers Les. Best wishes for the next 30 years!

Read More

Linda Shaw Celebrates 30 Years

Having started work at STC in June of 1988, Production Supervisor Linda Shaw celebrates 30 years at STC this week.
“When I started at STC, I had five kids in grade school. Now I have four grandkids who have graduated from high school,” Shaw said.

Linda started work at STC in transformer production, which is where she has spent her entire career in positions of increased responsibility. Prior to coming to STC, she spent about three years working at a shoe factory. While the type of production work at STC was much different, Linda says there were many other elements that carried over.

“Making shoes is quite a bit different than making transformers, but there were many things I was able to bring with me to STC,” Shaw said. “Being on time, being dependable, quality as an expectation, respecting your fellow workers, and respecting your customers, those are all very important no matter where you work.”

Linda Shaw at Transformer Production, mid-1990s

Linda was mentored early on by the Plant Manager Bob Simpson. During this time, she learned nearly every single aspect to building the many different custom transformers produced at STC. After about six years, Linda became a Team Leader, responsible for training her production group on the various transformer lines being built by the team.

“Linda was kind of like the lead for a long time anyway,” says Vice President of Operations Angie Calkin. “She had the personality and aptitude to understand the process—and she had a good work ethic.”

Linda was named Production Supervisor two or three years later, a job she’s held ever since. However, despite her experience and leadership roles, Linda didn’t necessarily feel ready for the additional responsibilities.

“I didn’t really feel qualified. I took the responsibility and learned as I went,” Shaw said. “I wasn’t outgoing so I had to learn how to open up and how to give orders. I learned to delegate too, so the work could be shared by the whole team.”

Linda Shaw at STC Manufacturing Facility

Has production work changed in the past 30 years?

“Things are much different,” says Shaw. “Technology has made things easier and faster, things like automatic winders, solder machines, and testing equipment.”

Linda’s not the type of person you’d guess has been at STC for 30 years though. She’s quick to smile and laugh, a little feisty, and still very much focused on getting the job done quickly and with quality.

Regarding her time at the shoe factory before coming to STC, Linda reflected on the values that have served her and her coworkers well.
“I was basically taught the same things there that I try to teach here. If you were buying the product, what would you expect—quality. It’s the golden rule really.”

STC President Brad Cross finds it easy to express his appreciation.

“Linda’s the kind of staff member every manager wants on their team. Her skills and leadership are second to none.”
Thanks for your hard work and friendship Linda, and best wishes for the next 30 years!

Read More

3D Printing Benefits STC Customers

For a number of years, STC engineers have utilized 3D printing in a variety of ways to cut down on both production costs and lead times. In some cases, 3D printing can save thousands of dollars in tooling costs during the design phase. In other cases, the 3D-printed assembly components can be used in the final design and no further tooling charges are necessary.

Design engineer Les Vaughn says one of the best times to benefit from 3D printing is during initial product development.

“As an example, take an encapsulation cup for a transformer,” says Vaughn. “These cups are used as a mold for the epoxy that actually encapsulates the wires. If the cup size we need for a custom design isn’t available as a stock item, it’s faster and less expensive to 3D print the cup than having them fabricated and shipped to us.”

An assembled encapsulation transformer (left) next to a 3D-printed encapsulation cup (right)

3D printing is also utilized for coil winding forms. The form provides a rigid surface around which wire is wound. In many cases, the form is made out of square tubes of Mylar or craft paper. However, specialty designs may require a custom form, and 3D printing offers a quick and cost-effective method for building that form.

An electronic coil wound around a craft-paper form

STC engineers also utilize 3D printing for electronics design and assembly. One particular STC product consists of circuit boards mounted to a face plate with interface controls. While looking for alternate brackets for mounting the PC boards to the face plate, CAD Technician Leslie Hopkins was able to quickly design and 3D print a face plate and PC boards with relocated mounting holes. This enabled her to easily test a number of different bracket styles.

A 3D-printed faceplate (bottom) and circuit board (top left) to test bracket fitting

Hopkins feels 3D-printing offers the best opportunity to test the final assembly and fit.

“It gave me a chance to test some different types of brackets to make sure they were secure, and to then make sure the assembled model fit in the cabinet rack where the final product is installed,” Hopkins said.

There are still other applications where 3D printing has been beneficial, such as in making fixtures to assist in electronics and magnetics assembly. However, the main benefits of each of the various 3D-printing applications remain the same.

“It comes down to speed, cutting down on lead times, more design iterations so we can design toward the highest possible quality,” says STC President Brad Cross. “And, of course, when you cut down on time, you also reduce cost.”

Read More
Electronics Assembly with Transformer for New Product Development

New Product Development with STC

In the 30-plus years STC has been in business, many of our customers have come into contact with us during the development phase for a new product.

In some cases, customers are able to submit detailed specifications, including information such as volt-ampere requirements, available dimensions (footprint or envelope), ambient operating temperature, and many other product requirements.

However, it’s perhaps more common for customers to be unable to submit detailed specifications, which presents an opportunity to consider the many available design options for a given project. For cases like this, we often discuss the following specifications (in addition to other requirements):

  • Maximum Heat Rise
  • Insulation Class
  • Maximum Excitation Current or “Surge Current”
  • Duty Cycle
  • Dielectric Strength
  • Leakage Inductance
  • Interwinding Capacitance
Electronics Assembly with Transformer for New Product Development

…one particular safety certification may be more suitable—and beneficial—than another, and customers must also consider the varying cost and potential benefits for the lab testing that goes along with these certifications.

Then there are other considerations, like safety certifications (such as UL, CE, ETL, and so forth). These certifications are assigned after lab testing to confirm the component meets specific safety requirements. After successful testing, the corresponding certification mark is typically applied and displayed on the component.

However, one particular safety certification may be more suitable—and beneficial—than another, and customers must also consider the varying cost and potential benefits for the lab testing that goes along with these certifications.

There are a number of factors to evaluate when considering available safety certifications, and STC design engineers know which questions to ask to determine the appropriate certification for each new product.

STC’s wide range of capabilities enable us to design both at the component level—as well as the circuitry around that component. Our magnetics capabilities enable us to integrate the right power-supply transformer, and our EMS capabilities enable us to work that power supply into the final electronics assembly. Need a unique enclosure for a box-build assembly? We also have 3D-modeling and printing capabilities, which are useful during the prototype phase to help a customer arrive at a precise case or cabinet design.

Product development is our specialty—and we look forward to working with you on your upcoming product. Contact us to see how we can help you.

Read More
Made in the USA by STC Sun Transformer

Trends in US Manufacturing

For the past number of years, the topic of “re-shoring” has been addressed in various manufacturing-industry publications, as well as in the general media. Re-shoring is the term used to describe companies moving segments of production or services back to the United States after having previously moved that work to off-shore locations.

However, in practice, moves to US manufacturing have primarily been the result of specific scenarios, according to STC President Brad Cross.

“There are specific situations where we have a distinct competitive edge, for example with government projects that require a certain percentage of the assemblies to be manufactured in the US,” says Cross. “But in addition to those types of projects, we also have an edge when companies must deal with defective parts that have entered their supply chain”

STC Electronics Circuit Board Manufactured in the USA

In these cases, component defects aren’t discovered until they’ve reached US plants. And by that time, the defective parts are already installed in assembled products, and additional defective parts are likely sitting in multiple shipping containers in various stages of the supply chain.

“When these kinds of problems arise, we often beat the overall costs that result from these types of overseas manufacturing problems,” Cross says. “While STC regularly outperforms other manufacturers in quality and lead time, these common types of situations give us yet another advantage.”

Another issue that drives re-shoring is source traceability, which has become a much bigger area of interest since the Dodd-Frank bill was signed in 2010. To address the humanitarian crisis in Central Africa, Section 1502 of this law requires that companies disclose whether any minerals used in their manufacturing (such as tin, tungsten, and gold) originate from the Democratic Republic of the Congo or any adjoining countries.

Angie Calkin, who serves at the STC Quality Manager, says this requirement gives US companies like STC an edge where source traceability is a concern.

“In order to be compliant with this law, we must carefully select and monitor US vendors who have already verified their own sources, and that’s an advantage for a company like ours since we have longstanding relationships with so many of our vendors.” Calkin says. “For overseas manufacturers, source traceability is rarely a requirement so when US companies try to require it of their suppliers, it becomes another layer of complexity that is almost impossible to get through.”

According to Cross, being familiar with your product sources reduces reliability issues that can result from another large area of concern, which is component counterfeiting.

“Component counterfeiting is something that has gone on for many years and seems to have increased during the last 20 years, and the key problem with counterfeiting is reliability,” Cross says.

Counterfeit components look identical to the name-brand models they copy, with fake date codes, product markings, and even stamped copies of the brand logo.

Statistics provided by the US Customs and Border Protection agency indicate that China/Hong Kong is by far the largest source of counterfeit goods that arrive in the United States, followed by India, Singapore, and a number of other countries. (https://www.cbp.gov/trade/priority-issues/ipr/statistics)

“It’s costly to test for these inferior components because the testing is time consuming and the tests are often destructive,” Cross added.

“For example, the use of inferior insulation or construction techniques in magnetics drastically reduce a transformer lifespan. Years ago, one of our customers found a Chinese source that was able to provide similar high-voltage transformers at about half our cost, so they began buying the import transformers. The resulting assembled products passed factory testing but ended up consistently failing in customer use far short of their warranties. We resumed supplying their transformers not long after that.”

Cross also claims the counterfeiting problem is even more prevalent in the electronics-component market, though the resulting issues are very similar.

“Semiconductors that would otherwise be expected to last for 20 years also pass testing after installation on the assembled product, but then often fail within a few months, leading to considerable warranty costs for the brand manufacturer.”

Read More
Sun Transformer Website Graphic

New Sun Transformer Website

March 8, 2017 – The new Sun Transformer web site is officially up and running! In addition to the always helpful Transformer Information section, the new site is optimized for both mobile and desktop. We’ve also taken great care to ensure that the new Sun Transformer website offers multiple ways to get in touch with our design engineers, be it by phone, email, or  by submitting your specifications directly through the site.

As our website continues to evolve through the addition of new content and magnetics information, consider bookmarking our site. Sun Transformer meets the most demanding power supply requirements, be they environmental, performance, or otherwise. Our goal is to become your primary source for power-supply information and to fulfill your electronic transformer requirements. Feel free to send us your specs—and let us know how we can help!

Read More
Honeywell Supplier Development Project Manager Warren Witmer

Quality Partnerships

As a manufacturer of high-reliability magnetics and electronics assemblies, STC often works in partnership with clients to ensure that our products meet the unique quality requirements for each specific project.

These requirements are in addition to STC’s existing quality and production certifications, and they are created to supplement quality procedures and help maintain error-free use in the field. They also include periodic assessments and audits performed by client project managers during onsite visits.

One recent onsite visit was from Warren Witmer, who works as Supplier Development Project Manager for Honeywell International. Witmer, who is also a Six Sigma Black Belt as well as a Quality Control Engineer, visits STC throughout the year to conduct inspections, process reviews, and carry out other quality-assurance related tasks.

Honeywell Supplier Development Project Manager Warren Witmer
Warren Witmer - Honeywell Supplier Development Project Manager

During his visits, Witmer works closely with STC Quality Manager Angie Calkin, who is responsible for implementing and overseeing the various quality programs at STC. According to Calkin, Witmer’s onsite visits add value to STC’s quality programs.

“We generally see Warren several times a year. His visits include supplier-development education, supplier assessments, and occasionally he performs field quality engineer duties such as first-article inspection and self release audits,” Calkin says. “I always enjoy Warren’s visits. They are generally productive and informative.”

When Witmer goes back to Honeywell, Calkin says, the cooperative work continues.

“Warren plays an essential role in our relationship with Honeywell. He is our go-to guy when an issue arises and we don’t know who in the organization to reach out to. If Warren can’t resolve the issue himself, he points us to appropriate person.”

These types of partnerships are not uncommon when it comes to the complex projects, and STC staff members are accustomed to making them work—for both STC as well as for our partners.

Read More
lead-wire-nick

Sun Transformer Celebrates 30 Years

Sun Transformer is celebrating their 30th anniversary as a manufacturer of high-reliability electronics and transformers. As an ISO 9001 certified business, Sun Transformer provides product design, development, manufacturing, assembly, testing, and sustainment services.

When asked to comment on why Sun Transformer has been able to grow and succeed for so many years, Production Supervisor Linda Shaw was politely interrupted by Tammie, a member of the Production team.

Tammie was concerned that a very slight nick in the lead-wire insulation for an assembled hardware component should be replaced. Linda looked closely at the lead wire, agreed with Tammie that it should be replaced, and said “Yes, [customer name] would not like this. I’ll replace the wire and take it to the Testing Department when I’m done.”

To an outsider, the nick was barely visible. To both Tammie and Linda, it was enough to keep the transformer from passing mechanical inspection.

“As a part of this company, we have learned to care about our customer’s needs and make sure we complete our orders on a timely basis and with the utmost quality. We also have established good communication with both our customers and employees.”

Later that day, after replacing the lead-wire and considering the initial question, Linda was able to offer some insightful comments.

“As a part of this company, we have learned to care about our customer’s needs and make sure we complete our orders on a timely basis and with the utmost quality. We also have established good communication with both our customers and employees.”

When asked about Sun Transformer president Brad Cross, Linda continues.

“He has been a very good leader because he works hard to operate a successful company. He listens and works with staff and employees alike to make sure everyone knows they are an important part of the company.”

Perhaps Tammie and Linda’s action earlier that day are the most telling reason for why Sun Transformer remains an industry leader when it comes to high-reliability electronic manufacturing services.

Read More
ISO 9001-2015 Quality System Revision

Sun Transformer on Track for ISO Revision

Sun Transformer has been certified to the ISO 9001 quality program continually since 1999, and Sun Transformer achieved re-certification in November of this year.

The ISO 9001 standards are revised every five years or so, requiring periodic recertification to the latest ISO revision. The standard was revised again this year, updating the previous 2008 standard.

The latest revision is ISO 9001:2015, which requires greater emphasis toward anticipating the risks present in the organization’s environment.

This risk-based thinking is not new to the ISO 9001 quality management system, which has always focused on anticipating and preventing mistakes. However, the revised standard has made the approach explicit by specifically addressing Organizational Context, Leadership, Planning, Support, and Performance Evaluation.

“It’s left very much up to the organization, taking into consideration, of course, their customer requirements and the regulatory framework in which they may operate, to define their own needs for documentation in order to manage the processes.”

While discussing the 2015 revision, Nigel Croft, Chair of the ISO subcommittee that developed and revised the standard, emphasized the flexible nature of the new standard.

According to Croft, “It’s left very much up to the organization, taking into consideration, of course, their customer requirements and the regulatory framework in which they may operate, to define their own needs for documentation in order to manage the processes.”

“It provides the confidence, that’s the key word, confidence, that customers around the world—right through the supply chain, business-to-business, business-to-consumer, right down to us as individuals—can have confidence in the products and services that they’re receiving from their certified suppliers.”

Because Sun Transformer was recently re-certified to the 2008 revision, the Quality team is in the process of implementing a plan for meeting new requirements as early as next year.

Angie Calkin, Vice President of Operations at Sun Transformer, is pleased with the company’s ability to meet the revised standard.

“Because we’ve considered and planned for the various risks that exist for us, the 2015 revision is not very different from the way we’ve done things,” Calkin said. “The biggest change for us will be in the documentation of some of these things.”

Read More