This is a frequency counter based on PIC16F628A. The original idea came from this project: LCD frequency counter. As you can see – very simple and yet elegant schematic. But I wanted to use 7-segment LED display, not LCD, so I found a second useful project: Simple 100MHz frequency counter which uses 6 digit LED display.
Frequency counter with PIC16F628A - [Link]
Two new low-cost, op amps with close to zero drift operation and low operating quiescent current have been introduced by On Semiconductor. Typical applications include front-end amplifier circuits and power management designs. The NCS325 and NCS333 provide rail-to-rail input and output performance and are optimized for low voltage operation of 1.8 V to 5.5 V. the op amps feature a quiescent operating current of 21 µA and 17 µA respectively at 3.3 V. The devices operate with a gain bandwidth of 350 kHz with ultra-low peak to peak noise down to 1.1 µV from 0.1 Hz to 10 Hz.
New zero-drift Op Amps - [Link]
Vishay Intertechnology introduced a new automotive-grade IHLP® low-profile, high-current inductor with an industry-high continuous operating temperature range to +180°C. Offered in the 2525 case size with a low profile of 3.0 mm, the new Vishay Dale IHLP-2525CZ-8A provides a wide range of inductance values from 0.47 µH to 22 µH.
With a frequency range up to 1 MHz, the AEC-Q200-qualified device released today serves as a high-performing, space- and power-saving solution for voltage regulator modules (VRM) and DC/DC converters in high-temperature automotive applications. End products include engine and transmission control units, diesel injection drivers, entertainment and navigation systems, noise suppression for motors, windshield wipers, HID and LED lighting, heating and ventilation blowers, and power seats and mirrors.
New Vishay Intertechnology Automotive-Grade Low-Profile, High-Current Inductor Offers Continuous High-Temperature Operation to +180°C - [Link]
by sdudley @ instructables.com: Mini – Table Saw / Router / Shaper for Dremel rotary tool.
Mini-Tablesaw / Router / Shaper for Dremel rotary tool - [Link]
If you have old USB headphones you can easily transform them to a USB sound. This card can be helpful during testing of home built devices connected to the speaker or microphone ports on the PC (for example A proof of concept of a simple sonar and Constructing a homemade microphone).
USB sound card made from a broken USB headphones - [Link]
Illuminated push-buttons represent a universal solution into every environment.
An answer to a question, whether it´s nicer to use a push-button with a backlight or not is perhaps a fully subjective matter. However besides an aesthetic point of view we know about at least two main reasons to use an illuminated push-button: easier orientation/ operation in a dark environment and an indication of a push-button status (activation of a given function).
So if we´ll decide for an illuminated push-button, it´s certainly beneficial to have a possibility to choose from a wide range of types and caps. In our offer can be found the best from this segment – components from a Danish MEC with over 70 years experience in production of push-buttons and switches.
Basic production portfolio of MEC switches can be divided into series „3“, „4“ and „5“. Seriesa „5“ i.e. for example 5G or 5E is the newest and the most perspective series, but also the “2” or “4” series are still popular. Types like 4FTH922 or 5GTH9358222 (4ATH98222) represent a ready-made solution with an LED. It´s also worth to mention a universal type 3FTL6, This type has besides a reliability, pleasant actuation and a crisp sound at switching yet one positive fature – it can be equipped with any 3mm LED. All that is necessary is to form leads into a required shape and apply a suitable cap. Perhaps the biggest advantage of this solution is a possibility to use a whatever LED according to your choice and this way to make a customized push-button (especially in smaller production batches). Naturally, at bigger production batches it´s possible to agree with a producer a production of various customized versions.
The most suitable type for your application can be easily chosen in the MEC catalogue (11MB).
MEC push-buttons can be found even in the dark - [Link]
A smartphone add-on from Seek Thermal turns your smartphone into a thermal imaging camera. Retailing at $199 the Seek comes in two flavors; one plugs into the lower micro USB connector of an Android device and the other connects to Apple devices running iOS 7.0 or above, which is optimized for the iPhone and iPod touch. At its relatively low price it makes it possible to view temperature gradients and show real-time temperature values on screen that could only previously have been seen with the help of expensive thermal imaging equipment.
Smartphone Thermal Imager - [Link]
A simplified explanation of how a capacitive MEMS accelerometer works.
How an accelerometer works! - [Link]
by George Gardner @ georgegardner.info:
This is a project that I’ve been working on for some time now, a good part of my life, but more recently for the past month. I’m not going to go through everything as to how I arrived at this point, but I can assure you it was through a lot of trial and error. I now present to you, the class D avr amp.
Class D AVR - [Link]
An app note (PDF) from KEMET on coupling two high lifetime devices: LEDs and Supercapacitors.
Light emitting diodes, or LEDs, have come to prominence in recent years in conventional lighting applications including flash lights, street lamps, traffic lights and emergency lighting. Their advantages over incandescent and compact fluorescent light sources include greater robustness, higher energy efficiency and a longer lifetime. Due to the constantly falling prices of LEDs, they are also now becoming more economical in the long term than traditional light sources.
Supercapacitors are high lifetime, high power devices that store relatively little energy compared to a battery. The low power requirements of LEDs means that a reasonably sized supercapacitor power source can still provide several hours of lighting on a single charge, while the high lifetime and low-temperature performance advantage over batteries is maintained. The emergence of 3.0 V supercapacitor cells as well as hybrids only strengthens the case for their use in LED applications due to the higher amount of energy stored in these new supercapacitor types. Supercapacitors are also free of lead, mercury, and cadmium, which eases any environmental concerns that may arise over the course of their long term use and eventual disposal/recycling.
App note: LED lighting and supercapacitors - [Link]