The LT6015 is a single Over-the-Top operational amplifier with outstanding precision over a 0V to 76V input common-mode voltage range. It incorporates multiple built in fault tolerant features, resulting in no-compromise performance over wide operating supply and temperature ranges. Over-the-Top inputs provide true operation well beyond the V rail. The LT6015 functions normally with its inputs up to 76V above V-, independent of whether V+ is 3V or 50V. Input offset voltage is 80μV max, input bias current is 5nA and low frequency noise is 0.5μVP-P, making the LT6015 suitable for a wide range of precision industrial, automotive and instrumentation applications. Fault protection modes guard against negative transients, reverse battery and other conditions. The LT6015 is available in a 5-lead SOT-23 package and is fully specified over -40°C to 85°C, -40°C to 125°C, and -55°C to 150°C temperature ranges.
LT6015 – 3.2MHz, 0.8V/μs Low Power, Over-The-Top Precision Op Amps - [Link]
By Ashok Bindra:
The use of low-dropout regulators, popularly known as LDOs, is common in many applications today because they provide a simple and inexpensive way to regulate an output voltage that is stepped-down from a higher input voltage. In addition, linear LDO voltage regulators contribute very-low noise as compared to switching regulators.
Nonetheless, to keep system power consumption low, such regulators must also feature ultra-low quiescent current (IQ) while providing excellent dynamic performance to ensure a stable, noise-free voltage rail, suitable for driving IC loads such as microprocessors, FPGAs, and other devices on the system board.
Selecting the Right Ultra-Low Quiescent-Current LDO Regulator - [Link]
UC20 module already provides besides a high speed UMTS/HSPA+ data transfer even the reception of data from GPS/ Glonass satellites.
When company Quectel launched on the market the UC20 3G module a few months ago, they also announced a forthcoming enhancement of functionality for reception of GPS/Glonass. We can unveil with pleasure, that reception of GPS/ Glonass signal via the UC20 module is already a reality and so this module has become one of the most versatile communication modules on the market. Combination of GSM/GPS/Glonass enables for example to design a device for monitoring of position of vehicles, goods, etc, by means of a single module.
At the same time, we also incorporated into our standard stock offer a miniPCIe version – UC20-E-MINIPCIE, increasing flexibility of usage of the module. All further information can be found in our recent article: Quectel 3G modules of UC20 series will ensure a fast transmission even on 900 MHz.
Quectel UC20 integrates GSM and GPS into a single module - [Link]
Dave reviews the Canadian Advance Devices Smart Tweezers LCD meter. What will he find? Does it cut the mustard?
Bonus LCR meter tutorial at the end.
EEVblog #81 – Smart Tweezers LCR Meter Review And Teardown - [Link]
Diyouware build a low-cost PCB printer for photoresist using a blue ray module. The UV laser scan the PCB surface and sensitize the UV resistive dry film.
About a year ago my brother and I engaged on a quixotic project to build from scratch a low-cost PCB printer for photoresist.
Finally we did it using a Blue Ray optical pickup (PHR-803T) and his UV laser/electronics to sensitize Dry-film.
The optical pickup is used through his own connector without any modification. We deduced the pinout using reverse engineering and designed a driver for an Arduino UNO to control it. Basically, we can adjust the laser power, turn the laser on/off, move the focus lens servo and read the photodiode array signal.
The control of the pickup allowed us implementing a laser auto-focus algorithm based on the astigmatic method. Is the same method use it to focus the laser beam on the Blue Ray disc.
The mechanics is an X/Y Cartesian table which moves the pickup with two Nema 16 stepper motors and T2.5 timing-belts. Most of the printer framework has been printed with a 3D Reprap printer, so itʼs replicable.
We also developed the Arduino UNO firmware, based on 3D printer firmware Marlin, and the server side software which send the HPGL commands to the printer. Eagle Cadsoft complete the “tool-chain”. It supports HPGL in his CAM processor, so is easy to design the circuit with Eagle, generate the HPGL file and send it to the printer.
DiyouPCB is a prototype and it’s still not perfect: we have some resonance and vibration issues that affect the quality of printing, but it’s a first step to have an alternative method to indirect methods as the famous toner transfer.
DiyouPCB is a PCB printer which uses a Blue Ray™ pickup - [Link]
David @ daqq.eu pointed us to his latest power supply tear-down.
The HP 6010A is a monster of a power supply, capable of providing 1kW. There are three limits: 17A, 200V and 1kW – that means that you can source 200V, but only up to 5A. You can suck 17A, but only at up to 60V.
I got this one second hand, possibly third or eight hand. Some butchery has been done – some parts were replaced (the old ones probably blew).
All in all, the device is a big power supply, not meant for precision but rather for power. The power supply works well, though I’ve yet to test the 1kW – it’s not exactly easy to sink 1kW of heat
HP 6010A – 1kW power supply Teardown - [Link]
I’ve been doing some tests with the STM32F407 to see how fast it can go, STMicro has released an almost identical one that runs at 180MHz, is it a marketing thing ? will they release a 200MHz version in a few months? who cares, anyway, I was able to run the STM32F407 at 240MHz without any “obvious” problems, in addition to overclocking, the code listed below lets you set some different frequencies, which could be useful for frequency scaling.
Overclocking the STM32F4 - [Link]
Researchers from several institutions in the U.S. and one from China have together developed a piezoelectric device that when implanted in the body onto a constantly moving organ is able to produce enough electricity to run a pacemaker or other implantable device. In their paper published in Proceedings of the National Academy of Sciences, the team describes the nature of their device and how it might be used in the future.
Currently, when the battery inside a device such as a pacemaker runs out of power, patients must undergo surgery to have it replaced. Several devices that take advantage of the body’s natural parts have been devised to allow for the creation of electricity internally so that implantable devices can run for a lifetime, preventing the need for additional surgery. Most such devices have been too small to actually charge a real device, however, as they are very much still in the research stage. In this new effort, the research team takes the idea further by creating miniature power plants that are large enough to power real implantable devices.
Team builds implantable piezoelectric nanoribbon devices strong enough to power pacemaker - [Link]
By Stephen Evanczuk
For circuits relying on lithium-ion cells, determining the amount of charge remaining in a cell requires specialized techniques that can complicate the design of energy-harvesting applications. Engineers can implement these techniques with MCUs and ADCs normally used in these applications, but at the cost of increased complexity. Instead, engineers can easily add this functionality to existing designs using dedicated “fuel-gauge” ICs available from manufacturers including Linear Technology, Maxim Integrated, STMicroelectronics, and Texas Instruments.
Determining the state of charge (SOC) in lithium-ion batteries is essential yet challenging due to the great variability in capacity not only across different cells, but also in the same cell. As a Li-ion cell ages, it loses its ability to store charge. Consequently, even if fully charged, an older cell would deliver usable voltage for a shorter period of time than a newer cell. With any Li-ion cell, SOC varies greatly depending on the temperature and discharge rate, resulting in a unique family of curves for any particular cell (Figure 1).
Fuel-Gauge ICs Simplify Li-Ion Cell Charge Monitoring - [Link]
ACME Systems announced a Micro new board: Arietta (now selling 9.99 €).
Here are the specs:
- CPU: Atmel’s AT91SAM9G25 (ARM9 clocked @ 400Mhz)
- RAM: 128 MByte DDR2
- MicroSD Socket for up to 32GB bootable Linux microSD (not included)
- USB 2.0 ports: 1 hi-speed host/device, 1 hi-speed host, 1 full-speed
- UART: 1 (RXD,TXD,RTS,CTS)
- I2C bus: 1
- SPI bus: 1 with 2 chip select (5 to 50 MHz)
- PWM: 4 lines
- A/D converters: 4 channels@10 bit
- Size: 25x51mm
- Power supply: single 3.3 Volt DC
- Line levels: TTL 3.3V (NOT 5V tolerant)
- Operative temperature range: -20 +70 °C
- Pinstrip: 20×2 pitch 2,54mm (100mils)
- PCB layers: 8
The software is supplied on a microSD (not included) in the same way as for the previous model, the Aria.
It sports Linux/Debian latest release and gives you the possibility to use almost every development languages and programming from any environment (such as Windows, Linux and Mac) via USB port. [via]
ACME Systems launched Arietta G25 a new micro Linux Board - [Link]