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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...
11 Myths About MRAM
Spin-torque magnetoresistive random access memory is emerging as the most promising of the next-generation memory technologies. MRAM does have its own peculiarities, though. Let’s examine some of the most common misconceptions or myths about MRAM...
Implementing finite state machines in embedded systems
A finite state machine is one of the most popular design patterns in embedded systems. Many applications from simple home appliances to complex communication systems implement event based state machines...
Using ESD Diodes as Voltage Clamps
When external overvoltage conditions are applied to an amplifier, ESD diodes are the last line of defense between your amplifier and electrical over stress. With proper understanding of how an ESD cell is implemented in a device, a designer can greatly extend the survival range of an amplifier with the appropriate circuit design...
Teardown: Drone streams live video
Back in May 2016, EDN published my teardown of Cheerson's $10 CX-10 quadrotor drone. More recently, you saw my dissection and analysis of its $15 CX-10C sibling, with an integrated still and video camera that captured images to a memory card inserted in the drone's microSD slot. And now it's time for the ~$20 CX-10W...
Project Diana bounces radio waves off moon, January 10, 1946
The US Army Signal Corps made the first attempt to "touch" another celestial body when on January 10, 1946, it bounced radio signals off the moon and received the reflected signals. Dubbed "Project Diana" for the Roman moon goddess, the effort led to what is today known as EME (Earth-Moon-Earth) communications, used for ham radio...
The basics of Bluetooth Low Energy
Bluetooth technology has revolutionized wireless communications between devices with its ubiquitous and simple characteristics. It allows devices to communicate without cables while maintaining high levels of security. Because of its low power and low cost, Bluetooth has played a pivotal role in the evolution of applications from high-speed automotive devices to complex medical devices...
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