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Call it the Mysterious Case of the Fallen Feline.

When Bob Blick's cat, Yum Yum, had a seizure one morning, the Santa Rosa man searched for the cause. Even the family vet was stumped.

Fortunately, Blick didn't have far to look for clues. The amateur inventor had set up computer-controlled cat doors to keep skunks and raccoons from getting Yum Yum's food.

The network also allowed him to track the cat's comings and goings. Blick's computer showed Yum Yum didn't go outside the night before the seizure.

Yum Yum's back on her feet, and Blick's investigation showed she may have had a brush with weed killer a few days earlier.

Blick typifies a new generation of high-tech tinkerers. Dissatisfied with off-the-shelf technology, they are making amazing gadgets in their basements and garages.

The growing movement is chronicled by O'Reilly Media's Make magazine, a year-old publication that has become the bible of the do-it-yourself technology set.

It's a new kind of business for the Sebastopol publisher, known mostly for its computer manuals and conferences. Make is as likely to appeal to 15-year-old hobbyists as it is to tech professionals.

"It certainly reaches an audience that doesn't read our computer books," said Dale Dougherty, executive editor of Make.

Dougherty said the quarterly magazine is promoting the uniquely American impulse to invent for the simple joy of it.

"It's helping people do things," Dougherty said. "A lot of magazines got away from that."

Homegrown technology is being driven by the Internet, which makes it easy for amateur inventors to share their ideas and feedback. There are free computer-aided design programs and links to Chinese factories that can manufacture new gadgets.

According to the Pew Research Center, a Washington, D.C., organization that tracks social trends, more than half of adult Internet users look for do-it-yourself information online.

Giant companies such as Microsoft are taking notice of the trend. Microsoft has released Visual Studio Express, software that lets amateurs build home networks to control lights, TVs and other electronics.

Blick calls his inventions "work avoidance systems," because they're just for fun. When Yum Yum touches a velcro patch on the cat door, it triggers servomotors that swing the door open. The door is shut by a microcontroller when Yum Yum goes through.

The system is linked to his PC, which keeps a record of Yum Yum's perambulations.

In addition to the digital cat doors, he created the propeller clock, an LED device that creates an illusion of digital readout suspended in the air.

Blick now is working on a gadget called the hackable handheld, a small, simple computer that kids can use to control robots or play games. Many of his creations are featured on his Web site, www.bobblick.com.

"I've always got something in my head," said Blick, an engineer who designs lasers for the building industry. Blick said he has no interest in commercializing his home inventions.

"I'm not an entrepreneur. I'm doing it as a hobby," he said. "I'm not going to make money off it, I'm just happy I've got my day job."

Make magazine, subtitled "technology on your time," features a variety of inventors and their projects. It takes a visual approach, using photos and diagrams to show how the gadgets are made.

The projects range from a kite-held camera for aerial photography to a wind-powered generator to an electric car.

"We care about how to make a water rocket in your back yard," said Make associate editor Phillip Torrone. "We say, 'try this at home.' "

Make also profiled Katie Barmazel, Ivy White and Sarah Davis, three Girl Scouts from Santa Rosa who built an 8-inch Dobson telescope from scratch.

Torrone said Make is a new twist on magazines like Scientific American and Popular Mechanics, periodicals that inspired the last generation of tinkerers.

The craze has even reached TV, with shows like "American Inventor," which gives gadget-makers a chance to show their ideas to a panel of experts.

"We're a nation of inventors," said Torrone. "It's human nature to want to know how things work."

Make has grown quickly since the magazine was launched with a 45,000-copy run in February 2005. A year later, Make is printing 80,000 copies, with sales almost equally split between subscribers and newsstand buyers.

Newsstand sales are impressive, since a single issue retails for $14.99.

Dougherty said the magazine has seven to 10 employees and a stable of freelance editors and writers. Design and layout are done at O'Reilly Media in Sebastopol.

There's also a workshop at O'Reilly where gadgets are made and tested.

Dougherty said Make isn't making a profit yet, but it should start making money in a couple of years.

"We're way ahead of our projections," he said.

In addition to the magazine, Make has a Web site, www.makezine.com, and a book.

This week, O'Reilly will sponsor the first Maker Faire at San Mateo Fairgrounds in San Mateo. Thousands of do-it-yourselfers are expected to exhibit their projects at the big science fair Saturday and Sunday, April 22-23.

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