JFET Moving Coil (MC) Pre-Preamp Kit


by Mark Houston @ diyaudioprojects.com:

I received the Boozhound Labs JFET Moving Coil (MC) Pre-Preamp Kit a while back and I promptly assembled the small circuit board. I’m a sucker for a simple kit and a hot iron. That is where it all stopped. The circuit board remained complete and laying about for a few years. Recently I required another MC stage because the tube moving-magnet (MM) preamp I had just completed did not work all that well with the Jean Hiraga MC stage I had been using for years. It appeared the Hiraga had too much output and was over-driving the tube stage. So I needed another MC stage.

JFET Moving Coil (MC) Pre-Preamp Kit – [Link]

Miniscope v2f


Here is another variant (after miniscope v2a, b, c, d, e) of simple PC/USB oscilloscope/recorder:


It extends miniscope v2e with PGA (MCP6S21) offering same sampling frequency (480 ksps, 8 bit real time streaming to PC allowing continuous recording up to 512M samples) but 8 gain ranges and high input impedance. Estimated price is $6 – $7 if using homemade PCB (single sided, 1.35 sq inches).

Miniscope v2f – [Link]

WiFi-based Weather Forecast and Clock


by soniktech.com:

This project is a stopgap on my way to building a ground-up “Internet of Things” base design around the ESP8266 SoC WiFi solution. I started by taking a few nixie tubes I’ve had lying around from a past project, and connecting them to a Nixie Power supply I found on ebay. After making sure they lit up, I wired the Nixies up to a HV5622 chip (which anyone who makes Nixie clocks should really consider for their designs).

WiFi-based Weather Forecast and Clock – [Link]

Attiny45 EMF Sensor


by Khaleel123 @ instructables.com:

This sensor is very sensitive and can pick up electrical signals from anything that uses power. It displays the amount of interference it picks up by sequentially lighting 4 led’s one after the other. I have tested it all around the house and its been kinda fun to see how different things compare. It can also be used to follow house electrical wiring inside the walls, yes its that sensitive.

Attiny45 EMF Sensor – [Link]

EEVblog #796 – Leica DVM6 3D Microscope

Dave checked out the Leica DVM6 3D microscope at the Electronex 2015 stand.
It’s an $80000 microscope that can do automated 3D surface mapping and measurements of surfaces, down to sub 1 micron.

EEVblog #796 – Leica DVM6 3D Microscope – [Link]

Transparent ESP8266 WiFi-to-Serial Bridge


jeelabs @ github.com has written a firmware for ESP8266 that enables it to talk to RS232 of your mcu via WiFi and also programm your mcu via WiFi. He writes:

This firmware connects an attached micro-controller to the internet using a ESP8266 Wifi module. It implements a number of features:

  • transparent bridge between Wifi and serial, useful for debugging or inputting into a uC
  • flash-programming attached Arduino/AVR microcontrollers as well as LPC800-series and other ARM microcontrollers via Wifi
  • outbound TCP (and thus HTTP) connections from the attached micro-controller to the internet
  • outbound REST HTTP requests from the attached micro-controller to the internet, protocol based on espduino and compatible with tuanpmt/espduino

The firmware includes a tiny HTTP server based on esphttpd with a simple web interface, many thanks to Jeroen Domburg for making it available! Many thanks to https://github.com/brunnels for contributions around the espduino functionality.

Transparent ESP8266 WiFi-to-Serial Bridge – [Link]

Building our own backup server using the Raspberry PI


by Michal Remias @ wpress.io:

We’ve been always thinking about building our own backup server using the ARM solution of Raspberry PI. When we needed to manage approx. 25 WordPress web projects couple of months ago we did some experiments with MainWP on virtual server at DigitalOcean.

To make the server a bit more reliable and stable, we decided to add a standalone power supply and a bit of intelligence to the whole solution. The additional components are not necessary but will help you to keep the server running even in the case of short power failures which could lead to damage of the backup files and errors in database.

Building our own backup server using the Raspberry PI – [Link]


Bias generators with ultralow noise and ripple for sensitive circuits


The LT®3095 generates two low-noise bias supplies from a common input voltage ranging from 3V to 20V. Each channel includes a fixed frequency, peak current-mode step-up switching regulator and a low-noise, singleresistor- programmable 50mA linear regulator. The linear regulator’s high power supply ripple rejection (PSRR) combined with its low-noise performance results in less than 100μVP-P output ripple and noise.

Bias generators with ultralow noise and ripple for sensitive circuits – [Link]

Charger interface IC avoids handset overheating at fast-charge rates


by Graham Prophet @ edn-europe.com:

Power Integrations offers a charger interface IC compatible with Qualcomm’s Quick Charge 3.0 specification; PI says its CHY103D IC optimises efficiency to prevent handset overheating during high-speed charging.

Added to the ChiPhy charger-interface IC family, PI saya this is the first IC for off-line AC-DC chargers compatible with the Quick Charge (QC) 3.0 protocol from Qualcomm Technologies. Used alongside Power Integrations’ InnoSwitch AC-DC switcher ICs, the CHY103D device incorporates all of the functions needed to support QC 3.0. The QC 3.0 protocol implemented in the CHY103D device substantially reduces losses in the smart mobile device handset during rapid charging. This permits system designers to choose to charge handsets faster or reduce phone touch-temperature during charging, and enhances the efficiency of the charging process.

Charger interface IC avoids handset overheating at fast-charge rates – [Link]

Atmel’s latest processor uses less juice


by Martin Cooke @ elektormagazine.com:

Atmel has announced a new series of Atmel | SMART ARM® Cortex®-A5-based microprocessors (MPUs). Firmly targeted at IoT applications they are said to deliver the world’s lowest power consumption for all MPUs in their class. They deliver sub 200 µA in retention mode with context preserved, 30 µs ultra-fast wake-up and a new backup mode with DDR in self-refresh at only 50 µA. Among the built-in features of the Atmel | SMART SAMA5D2 series includes a complete audio subsystem, lower pin-count and ultra-small package. The integrated PCI-level security capabilities will find applications in IoT devices, wearables and point of sale (POS) equipment.

Atmel’s latest processor uses less juice – [Link]