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Screens become speakers, smartphones can lose micro-speakers
Redux has followed earlier announcements of its surface-wave-based haptics technology with a version specifically targeted at the smartphone, with which it aspires to “kill off smartphone micro-speakers”. The company’s surface audio tech from Redux transforms a smartphone screen into a loudspeaker, and also provides haptic feedback...
The Case of the Misguided Gyro
I have heard that it is possible for a gyroscope heading to accumulate drift error over time. Can this happen in my IMU?...
Hubsan FPV drone teardown
My lower-midrange Hubsan X4+ FPV drone got stuck in a tree in the middle of winter. We managed to knock it down a couple of months ago, while there was still lots of snow to cushion the fall. After weathering the elements for over a month, it appeared to be mostly fine, except...
What's All This 555 Timer Stuff, Anyway?
When it comes to the venerable 555 timer, Paul Rako agrees with Bob Pease – avoid using it if your application demands any kind of precision...
The Man Who Invented VR Goggles 50 Years Too Soon
Hugo Gernsback believed millions yearned for his 3D TV eyeglasses Science fiction as we know it would not exist without Hugo Gernsback. He coined the term “science fiction” as the editor and publisher of Amazing Stories, the first magazine devoted to the burgeoning genre, which he launched in 1926...
New RF DAC Broadens Software-Defined Radio Horizon
High speed data converters have been used in communications applications for many years and can be found in much of the equipment that forms the basis of our connected world, from cellular telephone base stations to cable head-end equipment to radar and specialized communication systems. Recent technological advances have enabled clock rates on high speed data converters to move to higher and higher frequencies...
When what's old is new again, with a twist
The other day, while juggling a pile of recorded and blank videotapes for my VCR (please, no snickering that I still use a VCR!) I realized that what I would really like is a video recorder that combines the virtues of removable storage modules with modern digital technology...
Raspberry Pi Launches the New Compute Module 3
Just over 2 years ago the Raspberry Pi foundation launched the original Compute Module (CM1), which was based around the same BCM2835 processor of the original Raspberry Pi. The Raspberry Pi Foundation launched this board aimed at the industrial market, where companies were using the Raspberry Pi for commercial purposes...
Using op amps to reduce near-field EMI on PCBs. Part 2
As shown in previous sections, active filtering and CMRR can reliably reduce circuit noise in the device’s band-limited range, including DM and CM EMI up into the MHz range. However, exposure to RFI noise above the intended operating frequency range may cause non-linear behavior in the device...
Using op amps to reduce near-field EMI on PCBs. Part 1
Automotive, industrial, medical, and many other applications use sensitive analog circuits that must perform their function while remaining immune to noise disturbances in their local environment. Many of these disturbances occur on nearby “noisy” circuits located on the same printed circuit board, while other interference can be picked up by cable interfaces that couple noise onto the PCB and its circuits...
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