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About RF Cafe

Kirt Blattenberger - RF Cafe Webmaster

Copyright: 1996 - 2024
Webmaster:
    Kirt Blattenberger,

    BSEE - KB3UON

RF Cafe began life in 1996 as "RF Tools" in an AOL screen name web space totaling 2 MB. Its primary purpose was to provide me with ready access to commonly needed formulas and reference material while performing my work as an RF system and circuit design engineer. The World Wide Web (Internet) was largely an unknown entity at the time and bandwidth was a scarce commodity. Dial-up modems blazed along at 14.4 kbps while typing up your telephone line, and a nice lady's voice announced "You've Got Mail" when a new message arrived...

All trademarks, copyrights, patents, and other rights of ownership to images and text used on the RF Cafe website are hereby acknowledged.

My Hobby Website:

AirplanesAndRockets.com

Slingshot Flying Pig Accelerometer

Flying Pig Accelerometer - RF Cafe

The Catapult "Flying Pig" - so now pigs do fly. Note the accelerometer.

My daughter, Sally, in addition to owning and operating a very successful horse riding school named Equine Kingdom Riding Academy, has a rather large eBay store she uses as a venue for selling items purchased at the local Goodwill "Bins" store. She often buys vintage toys with electronics features - sometimes working and sometimes not. A properly functioning vintage toy, be it a stuffed animal or a game of some sort, can make a huge difference in the resale price. When that is the case, she sends them home with me to attempt a repair. Many times the problem is corroded contacts from leaky batteries. A dental pick and some isopropyl alcohol usually solves the problem. When that doesn't work, it's time to open 'er up for a deeper look.

Over the years I have found problems ranging from dirty activation switches to broken wires to loose solder joints on circuit boards (a surprising amount of those). Some of the toys have incredibly complex electromechanical devices for moving limbs, mouths, and eyes. One doll I recently looked at had a wireless connection to a cassette tape deck that gave her voice and commanded her movements - that was a late 1980s vintage believe it or not. I don't usually spend a lot of time on any one item, but sometimes I get consumed in the chase and put in more effort than it is worth.

Featured Product Archive

The inventions and products featured on these pages were chosen either for their uniqueness in the RF engineering realm, or are simply awesome (or ridiculous) enough to warrant an appearance.

| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 |

Occasionally Sally gets stuff just for the fun of it - like this Catapult "Flying Pig" toy. She gave it to Melanie as a memento of our latest trip to North Carolina. As the photo shows, a couple pieces of surgical tubing serve as the slingshot mechanism, and the pigs starts oinking when launched. There was nothing wrong with it, but I was curious as to the accelerometer that must trigger the oinking. Integrated circuit microelectromechanical systems (MEMS) accelerators are ubiquitous in today's world inside every smartphone and R/C drone, so I figure that is what I would find. Again per the photo, you can see it is actually a purely mechanical device that has a weak spring mounted inside a metal can that flexes and closes the circuit when accelerated. My second thought when seeing the construction (my first thought was, "wow") was that it looks a lot like a helical filter cavity. This is really more of a step back to 1970s design, but it works.

 

 

Posted May 15, 2019

Windfreak Technologies Frequency Synthesizers - RF Cafe
Innovative Power Products Passive RF Products - RF Cafe
everythingRF RF & Microwave Parts Database - RF Cafe
 

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