Dimitar Kolev writes:
I test both, just with one LED for now (like 15mA) – they was working quite OK for distances up to 1-2cm, just some paper and thin air between TX and RX coils. With appropriate ferite it seems distance and coupling can be even better.
Just to fire further my interest, chip labels on board were erased, but fortunately I found a good picture where most of the labels were visible. Unfortunately no results after some googling, but finally I think I found the manufacturer of chips and some other wireless power/charging modules – it should be Elecoteq Electronics Website is only in Chinese, so I read what I can via Google translate. I found no datasheets, but for one there was some basic description
Wireless power and charging test and some reverse engineering - [Link]
Potentially, headphone listening can be technically superior since room reflections are eliminated and the intimate contact between transducer and ear mean that only tiny amounts of power are required. The small power requirement means that transducers can be operated at a small fraction of their full excursion capabilities thus reducing THD and other non-linear distortions. This design of a dedicated headphones amplifier is potentially controversial in that it has only unity voltage gain and employs vacuum tubes and transistors in the same design.
Hybrid Headphone Amplifier – [Link]
These recent breakthroughs in electrical component technology are likely to have a significant impact on the electronics industry – and on people’s everyday lives.
Your’e probably aware of the superstar conductor of the future, Graphene: “A wonder material that is the world’s thinnest, strongest and most conductive material with the potential to revolutionise diverse applications; from smartphones and ultrafast broadband to drug delivery and computer chips”.
New electronic components will change lives in 2014 - [Link]
Texas Instruments is one of the most dominant technology companies ever. Behind Intel and Samsung, it is the world’s third largest producer of semiconductors. In addition, they are the largest manufacturer of digital signal processors and analog semiconductors. Young students may just know of TI as producers of their world famous graphing calculators. However, for the older, more experienced students, they quickly learn TI has technology that can be found everywhere. In fact, many of the ICs used for basic electronics are all created by TI.
There is also one additional area TI’s technology excels at. That would be in energy efficient electronics. One of the more popular devices is the MSP 430 microcontroller family. These MCUs allow developers to create embedded applications, which can manage power extremely efficient. The CPU can work with speeds up to 25 MHz or can be lowered to save power in applications. More importantly, the MCU has a low power idle mode. When working in this mode the CPU will draw as little as 1 micro-Amp of current. Along with the low power capabilities, this MCU can also work with all the usual embedded electronics communication protocols and peripherals.
Texas Instruments releases new battery saving technology – MaxLife - [Link]
Company Hammond brings to market quality universal holders enabling to use your device even on a DIN rail.
DIN rail has admittedly a lot of advantages and no wonder, that it became a very favourite „platformou“ for not only distribution boxes, but also for various alarms, centrals, and other devices even with a finer electronics.
Naturally, to attach an enclosure to a DIN rail it is necessary that the enclosure was directly designed for a DIN rail or it can be any other enclosure amended with a suitable holder (clip). DIN rail enclosures are usually the first choice, but their shape, size, material and other features aren´t always suitable for our concrete device. For these purposes we incorporated to our stock offer 4 new holders of the 1427DIN series. 3 types – 1427DIN42M, 1427DIN75M and 1427DIN100M are made of aluminium with an anodized surface and 1 type – 1427DINCLIP is form a rigid nylon (UL94-V0). All aluminium types are supplied including a screw, washer and nut for fastening to an enclosure. Aluminium types are constructed so that to attach or loosen from a DIN rail, no tool is necessary. A reliable fastening to DIN rail ensures a spring from a galvanized steel and to its release, it´s only necessary to press the clip from the bottom and to tilt the upper part from a DIN rail. An advantage of holders is, that they´re usable with various enclosures, even from other producers.
Detailed drawings can be found in datasheets at given types. On the Hammond website it´s also possible to find CAD files and 3D models. In case of interest in any HAMMOND products please contact us at firstname.lastname@example.org.
New DIN rail clips 1427 series can fasten (almost) every enclosure – [Link]
And how NOT to blow up your Arduino.
Your oscilloscope ground clip lead can be a potential accident waiting to happen.
Why? And how do you avoid it?
The basics about measuring mains earth referenced equipment with your oscilloscope.
EEVblog #279 – How NOT To Blow Up Your Oscilloscope! - [Link]
Professor John A. Rodgers has previously taught us what the future has in store by way of flexible, stampable microelectronics that adhere to the surface of human skin. As revolutionary as those devices can be – providing critical health-related information from real-time physiological monitoring of the human body – they are limited in their ability to penetrate the depth of human tissue for an even greater understanding. A recent study by Rodgers and his team from UIUC alongside Professor Michael R. Bruchas of Washington University has found a unique solution to the tissue issue – injectable LEDs that can stimulate and monitor brain activity.
Studying the brain with micro-injectable LEDs - [Link]
At the heart of this circuit is a precision integrated temperature sensor, LM35 (IC1), which provides an accurate linear and directly proportional output in mV, from 0 to +155 degrees C. Designed to draw a minimal current of its own, the LM35 has very low self heating in still air. Here the output of the LM35 is applied to the non-inverting input of a comparator wired around a CA3130 opamp (IC2). A voltage divider network R3-P1 sets the threshold voltage, at the inverting input of the opamp. The threshold voltage determines the adjustable temperature trip level at which the circuit is activated.
When the measured temperature exceeds the user-defined level, the comparator pulls its output High to approx. 2.2 V causing transistor T1 to be forward biased instantly. T2 is also switched on, supplying the oscillator circuit around IC3 with sufficient voltage to start working. The 555 set up in astable mode directly drives active piezoelectric buzzer Bz1 to raise a loud alert. Components R7, R8 and C4 determine the on/off rhythm of the buzzer.
Overheat Detector Alarm - [Link]
What was technology like inside a 1994 Motorola MicroTAC GSM mobile phone?
EEVBlog #492 – Vintage Motorola MicroTAC Mobile Phone Teardown - [Link]