by Martin Rowe @ edn.com:
The DMM (digital multimeter) is a basic measurement tool for nearly every electrical engineer and many other engineers. With the push to constantly improve power efficiency in electronic designs comes a need to not only measure voltage and current, but to dynamically see them as well. Keithey’s DMM7510 combines a 7½-digit DMM with an 18-bit, 1 Msample/s digitizer, which lets you see measurements both numerically and graphically.
Having the ability to see waveforms lets you uncover problems that used to require an oscilloscope. The DMM7510 also features a 5-in. capacitive touch screen. You can use gestures such as swipes and pinches to sweep though setup menus or zoom in or out of waveforms. I tried it firsthand just prior to today’s product launch, as the short video below shows.
DMM provides numerical and graphical displays - [Link]
If you´re deciding whether it´s worth to use a backup battery, we bring you a few remarks why to go for it or not.
Lithium battery Xeno Energy with a lifetime of over 10 years and rules for their usage were brought to you in our article „10 years of operation for 1 battery?”. They´re usable as a “main” power source for low power consumption devices and the second main field of their usage is a power supply backup. In contrast to the smallest cells used for PC memories backup (BIOS) for example, the types, which we keep in stock feature capacity of several Ah and they´re also able to provide a relatively decent current. That enables to use such battery also for a real operation of the device (MCU) during the power supply dropout.
Probably the main reason why not to use a backup battery is a doubt about higher production costs of a given device. However, when we look at the sales price in our e-shop, we find, that common PCB types like for example XL-050F AX (LS14250CNA) or XL-060F AX (LS14500CNA) are available for the price of max. 4 Eur/pce. At the same time, using this type of batteries eliminates the need for a battery holder, charging chip, etc.
The newest contribution on the field of PCB lithium batteries in our stock is the type XL-210F/STD 5,5mm, what´s the disc with 33mm diameter and only 6.6mm height, with leads to be soldered to PCB (THT). Low profile enables usage even in slim devices and everywhere, where common cylinder types are not suitable.
Further information will provide you the Xeno short form catalogue as well as detailed datasheets of Xeno batteries. In the Xeno production portfolio can also be found special batteries with a higher pulse capacity and type for extra high temperatures -55 to +130°C.
Backup battery soldered directly to a PCB? - [Link]
This minimalistic board is packed with features and comes with an extensive ecosystem of documentation and firmware.
For the student (we are never too old) that wants to fast track his career as a professional firmware developer there is:
- a detailed getting started guide
- an Atmel AVR quick start guide, with tutorials and examples
- Recommend best practices
For the developer that wants to improve his game there is:
- A header to quickly connect different kinds of peripherals (GPIO, A/D, UART, SPI & I2C). Notice that each interface has it’s own +3V3 and GND pins to make wiring easier and also improves EMC.
- A full-featured CLI application to experiment with the connected device and verify that it works, before committing to a single line of C code.
- A firmware framework that lays the foundation so that you can quickly develop a new application.
- A Temp&Pressure Logger and Analog voltage Logger application that demonstrates how you can quickly develop your own custom logging application using the onboard AT45D DataFlash.
Atmel ATmega328P Scorpion Board - [Link]
Only 0.5 mm thick (or thin) SMD LED Kungbright KPHCM-2012 can be placed practically everywhere, without increasing an overall PCB thickness.
LED production technology currently surprises mainly on the field of white LEDs for lighting (SSL). But also color LEDs are getting still better as for the efficiency or for example in case of series Kingbright KPHCM – in miniature dimensions. Concretely series series KPHCM has standard „0805 SMD“ (2,0×1,25mm) dimensions, but unusual is it height – only 0.4mm. In reality, it appears so, that this LED will certainly be one of the lowest profile components on a PCB, hardly higher than a drop of a solder. This low-profile LED finds its place in all space-critical applications, for backlight of switches, displays and similar.Stock type – KPHCM-2012SECK is the red-orange LED (601 nm) with a relatively high luminiosity of 240 mcd (typ.). Similarly like at majority of standard diodes, maximum continuous current is 20 mA (abs. max. 30 mA). Detailed description will provide you the Kingbright KPHCM datasheet. Should you be interested in even smaller and thinner LED, than the KPG-1005 (1,0×0,5×0,2mm) series will be the right choice for you.
We have for you LED thinner than a solder drop - [Link]
kraftwerk opens up a whole new dimension in freedom and independence when it comes to supplying your mobile electronic devices with energy. Why? Because kraftwerk enables you to generate your own energy using a small, handy device – in such large amounts that you can run your iPhone, tablet, or even your GoPro camera for weeks!
The Kraftwerk Fuel Cell - [Link]
Perhaps the most frequently used rechargeable batteries on the market nowadays – Lithium-Polymer (Li-Po) can be found also in our offer.
From the beginning of electronics, the world searches for an “ideal” rechargeable battery. So far such a battery doesn´t exist (maybe supercapacitors in the future), but Li-Po (Li-Pol) cells are quite near to an ideal in some aspects.
Very low self-discharge (approx. 5% / month), high voltage of a cell (3,7-3,8V average), high energy density and a low weight, considerably stable discharge voltage and a possibility to recharge anytime are one of the main advantages of Li-Po cells. Another benefits are advantageous flat shape, high variability in dimensions and a long lifetime. No wonder, that Li-Po cells have become no. 1 in consumer electronics, hand tools and in many industrial devices.
Perhaps the only drawback of these cells is their lower chemical stability at overcharging (in a corner case ending up with a fire). But that´s the case which is practically eliminated at a common operation with a suitable charging circuit (chip or a charger intended for Li-Po).
Basic principle at usage is not to exceed approx. 4.25V charging voltage and the battery is almost discharged at a voltage below approx. 3.0V (2.75V). On the very end of a discharge cycle, the inner resistance slightly increases, what can cause a slight heating of a battery at higher currents – it is a normal behavior. Charging is usually based on a method constant voltage/ limited current. In principle it´s possible to use the same chargers and charging circuits for Li-Ion as well as Li-Po cells.
At a usual usage and discharging to say 20-80%, Li-Po cells will reward you by a reliable operation and a long lifetime. Flat shape is ideal for various handheld equipment, as well for usage in flat enclosures. In respect to a low self-discharge it´s possible to use Li-Po cells even as a backup energy source.
In our offer can be found several several Li-Po types from company EEMB with a capacity of 130 mAh to 2000 mAh. Exact list of available types and datasheets can be found below this article. Upon request, we´re able to provide you also many other types.
Try the most favorite type of batteries - [Link]
Switch-mode regulator Traco TSR 0.5 will give you as much as you need. If you have an application, where 0.5A is sufficient, then the new series of DC/DC modules is ideal for you.
Maybe, it´s worth to ask a question, whether it makes sense to use a switch-mode regulator for such a low current? For sure yes, at least because of two reasons. If we need to create 3.3V from for example 12V, then at a current of 0.5A a power loss of 4.35W appears at a classic linear regulator. That´s already a quite considerable power, able to heat up a device – especially at smaller enclosures and a dense population on a PCB.
Another reason is energy saving – especially at battery powered devices. Switch mode power supplies (SMPS) have a “genial” feature, that thanks to their high efficiency we use practically whole power drawn from a source, i.e. if we need say 5V/0.5A from a 15V source – we won´t take from it 0.5A but only approx. 0,17-0,18A.
Novelty of company Traco Electronic – series TSR 0.5 is by its function very similar to well known, proven DC/DC regulators TSR1 or TSRN1. The main difference is in a smaller allowed current and a feelingly lower price . That ´s why this series is very suitable for any application, where a current of 0.5A will be sufficient. A big advantage can be a wide operating temperatures range from -40 to +90°C (power derating 5%/K at temperature above 80°C). Maximum input voltage of 32V enables a usage even at power supplying from various alternative energy sources with a big input voltage fluctuations.
This novelty is so far available in a version with 5V output voltage (TSR 0.5-2450) and soon there will be another.
Why to pay for the current, which you won´t use? - [Link]
Beauty in simplicity – adjustable bimetal thermostat operates independently from a power supply.
Thermal comfort is, when a temperature in a house is 21-24 °C and a relative humidity is …. No, sorry, your device can withstand much more. At least 0 to 60°C or much more. If you have a device, where you need to guide the temperature, then DIN-rail thermostats are the simplest usable solution. Series 7T from company Finder offers a possibility to use such thermostats to control heating, cooling (fans) or their combination…
Besides purely industrial applications, these thermostats can also be used to control temperature in buildings or garages – for example as a frost protection. In our stock can be found five types, mainly with a range of 0 to +60°C. Available are 2 basic series – 7T81 and 7T91. 7T81 is a narrower, only 17.5 mm wide series. Series 7T91 is wider, with a more perforated enclosure, i.e. there´s an assumption of somewhat quicker reaction to temperature changes.
Orientation among types is simple. Types with a suffix …23xx are intended for switching of cooling (blue adjustable knob), i.e. after reaching a set temperature a bimetal contact switches on. Here belong for example types 7T.81.0.000.2303 and 7T.91.0.000.2303.
Types with a suffix …24xx are intended for switching of heating (red adjustable knob), i.e. after reaching a set temperature, a contact switches off. Here belong for example types 7T.81.0.000.2403 and 7T.91.0.000.2403. However in the 7T series can also be found types usable in both ways, for example 7T.91.0.000.2004 (range +5 to +60°C).
Thermostats Finder ensure a thermal comfort to your devices - [Link]
New version of a favorite RFID module ID12LA will enable you to implement RFID into your device even more easily thanks to a wide range of supply voltage.
Literally “globally known” with an integrated antenna – ID12 and its familiar like for example ID2 or ID20 have earned a big popularity thanks to a flawless usage and reliability. Perhaps the only disadvantage of this module was narrow range of operating supply voltage, what in praxis enabled only usage of 5V DC. New version – ID12LA solves also this small drawback and the new module works in a range of 2.8-5VDC. This also enable their usage even with a 3.3V logic and for example in battery operated devices (3-4x NiMH, or 1x Lithium cell, …) without necessity of DC converters or a precise voltage regulation.
The module ID12LA (range approx. 12cm), as well as ID20LA (range approx.16cm) are in our stable stock offer, similarly also the Mifare version (13,56 MHz) – ID20MFIA. In case, that you prefer the maximum range, it´s possible to use module ID2 supplied with an external antenna (range up to 30 cm).
Detailed information will provide you datasheets at particular types below the article.
RFID module ID12LA will also abide a lower voltage - [Link]
The Russian smartphone called the YotaPhone will go on sale in the U.S. later in 2015. Its best feature is that it features an E-Ink e-reader on the back that extends its battery life to 100 hours. But will people buy it? We already know that the U.S. National Security Agency is listening to our phone calls for terrorist talk, but what might the Russian’s have hidden inside their smartphone? Probably nothing, but it makes you wonder: R. Colin Johnson @NextGenLog and EE Times
Russian Smartphone Sports Two Screens, but Is It Spying on Its User Too - [Link]