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Networking & Cables

Jeremy Burkhardt’s Biz Partner Builds a Better Video Doorbell Transformer

Wharton MBA, lawyer, investor, and Jeremy Burkhardt's M&A guy Brent Sonnek-Schmelz runs OhmKat, manufacturer of purpose-built power supplies for Ring, Nest, Skybell and other popular video doorbells.

Jeremy Burkhardt’s Biz Partner Builds a Better Video Doorbell Transformer
OhmKat transformers are purpose-built for specific video doorbell products. Don't you dare cross-contaminate.

Julie Jacobson · June 8, 2018

If you think video doorbells are a snoozefest, then you probably count doorbell transformers as the lowest of low on the excitement charts, maybe somewhere between zip ties and banana plugs. OhmKat is out to elevate doorbell transformers to all new levels of geek chic.

OhmKat makes purpose-built power supplies. Emphasis on purpose … singular. One transformer … one job.

Don’t use an OhmKat Nest Hello transformer with an August or Ring doorbell, for example. Heck, Ring alone has three doorbell flavors – plain old Doorbell, Doorbell 2 and Doorbell PRO – and each requires its own transformer model.

OhmKat principal Brent Sonnek-Schmelz is a transformer himself -- Wharton MBA, lawyer, investor, and an associate at Kinsman Capital when it led a SpeakerCraft buyout with Jeremy Burkhardt in 2000. On top of answering every pesky transformer-related question in OhmKat forums, Sonnek-Schmelz does M&A work for Burkhardt’s Origin Acoustics, which offers the OhmKat alongside loudspeakers, acoustical treatments and other home-technology products.

Sonnek-Schmelz tells CE Pro that more than half of OhmKat sales are through the custom-installation channel.

OhmKat Transformers

OhmKat makes transformers for eight different video doorbells that otherwise were built to exploit a home’s existing two-wire doorbell connection.

“While video doorbells are designed to work with hard wired doorbells,” says Sonnek-Schmelz, “the variability in doorbell transformers in the field - whether due to age, poor installation, wire degradation, etc. - has resulted in many of our professional customers preferring our power supplies.”

He adds that the OhmKat products offer “consistent, clean power and provide protection in case of power surges or short situations to sensitive electronics.”

The OhmKat products all look alike, their model names sound alike, and their price tags are exactly alike ($34.99), but they each have slightly different specs. For example:

  • Compatible with Ring:  rated 110v input, 18vAC output and 6va power output
  • Compatible with Ring PRO: rated 110v input, 18vAC output and 9va power output
  • Compatible with August Doorbell Cam: rated 110v input, 18vAC output and 9va power output
  • Compatible with Skybell HD: rated 110v input, 18vAC output and 6va power output

OhmKat issues stern warnings against cross-contamination.

 “The Power Supplies have specific capabilities and tolerances depending on the type of video doorbell you purchased,” according to the company. “We tested all our power supplies extensively across the entire operating power range and they provide a good margin of safety across all operating conditions.”

The OhmKat products are complete as shipped. No additional resistors or other components are required.



  About the Author

Julie Jacobson, recipient of the 2014 CEA TechHome Leadership Award, is co-founder of EH Publishing, producer of CE Pro, Electronic House, Commercial Integrator, Security Sales and other leading technology publications. She currently spends most of her time writing for CE Pro in the areas of home automation, security, networked A/V and the business of home systems integration. Julie majored in Economics at the University of Michigan, spent a year abroad at Cambridge University, earned an MBA from the University of Texas at Austin, and has never taken a journalism class in her life. She's a washed-up Ultimate Frisbee player currently residing in Carlsbad, Calif. Email Julie at [email protected]

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  Article Topics


Networking & Cables · Power Protection · Products · Doorbell · OhmKat · Origin Acoustics · All Topics
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