samDEV_09 – Mini devboard for Atmel’s SAMD09 ARM Cortex M0+ Microcontroller


A Basic board to test the Atmel SAMD09. On board there is also a CH340 uart to usb bridge

Build this board to getting started with the SAMD microcontroller family after I made the mistake to try the much bigger SAMD21 first. The SAMD09 used here is he smallest from this family and therefore has the shortest (still 709 p.) datasheet. I think this board will be, as my other microcontroller breakout boards, very useful for an early prototyping phase on breadboard. So far I quite like the SAMD09. If you compare it to the the ATmegas there are a lot more possibilities. Maybe this is the Arduino Nano killer for me.

samDEV_09 – Mini devboard for Atmel’s SAMD09 ARM Cortex M0+ Microcontroller – [Link]

Simple nanosecond-width pulse generator provides high performance


by Jim Williams @

If you need to produce extremely fast pulses in response to an input and trigger, such as for sampling applications, the predictably programmable short-time-interval generator has broad uses. The circuit of Figure 1, built around a quad high-speed comparator and a high-speed gate, has settable 0- to 10 ns output width with 520 ps, 5V transitions. Pulse width varies less than 100 ps with 5V supply variations of 65%. The minimum input-trigger width is 30 ns, and input-output delay is 18 ns.

Simple nanosecond-width pulse generator provides high performance – [Link]

Micro-supercapacitor fits inside IoT chips


by Jan Buiting @

Zero-power autonomous devices will abound on the IoT of the future, and battery manufacturers are scratching their heads to come up with the best possible solution ensuring high energy and power density at miniature scale. A new material developed recently at Finland-based VTT shows promise, based on energy and power density of a supercapacitor depending on the surface area and conductivity of the solid electrodes. The size? So small it fits inside an IC.

Micro-supercapacitor fits inside IoT chips – [Link]

Bargraph Current Meter 0-1A Range – PIC16F686


Tiny Bar-Graph current meter displays a Red color bright, easy to read display of current range from 0 to 1A.  This Bar-Graph has 20 segments in single color and display 0 to 1Amp Current. The Barograph current monitor is based on PIC microcontroller with 10 Bit resolution ADC.  This high performance measurement provides unique capabilities and can be used in various applications. The Bargraph can display 0 to 1Amp with 20 LED with 50mA (Approx.) resolutions.  Each LED output provided with Solder- jumper for output set point can be configured for control, alarm, Relay Trigger, ideal solution to check the DC Motor current. It is mainly used to measure low side current.


  • Supply 7.5 V to 18V DC (Direct 5V Input Possible)
  • Input 0 to 1Amps across onboard shunt resistor (Max Load supply 48V)
  • Output Display 20 Color RED SMD LEDs
  • Compact Board with SMD Components
  • Supply input Header Connecter
  • On Board 5V Regulator
  • Solder Jumper on each LED for Output Control, Alarm, and Relay

Bargraph Current Meter 0-1A Range – PIC16F686 – [Link]

Electromagnetic Field Detector using an Arduino


by LightBug @

In today’s instructable I’m going to show you how to build your own electromagnetic field meter using an Arduino. This device can be used to detect mains voltage, static electricity and radiations from certain devices.

Electromagnetic Field Detector using an Arduino – [Link]

Elektor GREEN Membership @ 50% OFF – exclusive for Elab visitors


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  • 6 Editions of Elektor Magazine (132 pages each) in PDF format
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Intro to Printed Circuit Boards


This is an intriduconary article about PCBs and their uses.

In this instructable, I’ll go over what a printed circuit board is, where they are used, and the basics of how to make one yourself. So sit back, strap in, and enjoy learning about this very important and interesting method of making electronics!

Intro to Printed Circuit Boards – [Link]

DIY 1GHz Active Probe For Under 20$


thirschbuechler @ shows us how to build a 1GHz active probe using BF998 dual-gate MOSFET and some other RF components.

This Instructable will show you how to build a 1GHz* Fet-based Active Probe, the Fetprobe, for about 10$*, provided you have access to an electronics lab. It is based on an Elektor-magazine article (see the pdf’s addendum, section literature in my thesis) beside some other designs. However, as topic of my bachelor-thesis I wanted to find out how good these designs really are and how far one can push them.

DIY 1GHz Active Probe For Under 20$ – [Link]

LTC3895 – Step-down controller handles 150 V

Linear Technology Corporation announces the LTC3895 , a high voltage non-isolated synchronous step-down switching regulator controller that drives an all N-channel MOSFET power stage. Its 4V to 140V (150V abs max) input voltage range is designed to operate from a high input voltage source or from an input that has high voltage surges, eliminating the need for external surge suppression devices. The LTC3895 continues to operate at up to 100% duty cycle during input voltage dips down to 4V, making it well suited for transportation, industrial control, robotic and datacom applications.
The output voltage can be set from 0.8V to 60V at output currents up to 20amps with efficiencies as high as 96%. This part draws only 40μA in sleep mode with the output voltage in regulation, ideal for always-on systems. An internal charge pump allows for 100% duty cycle operation in dropout, a useful feature when powered from a battery during discharge. The
LTC3895’s powerful 1Ω N-channel MOSFET gate drivers can be adjusted from 5V to 10V to enable the use of logic- or standard-level MOSFETs to maximize efficiency. To prevent high on-
chip power dissipation in high input voltage applications, the LTC3895 includes an NDRV pin which drives the gate of an optional external N-channel MOSFET acting as a low dropout linear
regulator to supply IC power. The EXT VCC pin permits the LTC3895 to be powered from the output of the switching regulator or other available source, reducing power dissipation and improving efficiency.
LTC3895 – Step-down controller handles 150 V – [Link]

Pressure, temperature and humidity sensor board with RS485


Mare shares his sensor board based on MS5637 HDC108. He writes:

This is another small module to measure air pressure, temperature and humidity. Two sensors are on-board: MS5637 and HDC1080. Microcontroller is small cortex M0 in TSSOP-20 housing from STM: STM32F070CxP. The SN65HVD72DGKR provides RS485 interface functionality with half duplex mode. Voltage regulator, reverse polarity protection and some LED indicators are provided on-board. Complete module is 10x55mm, produced on single-sided PCB, easily producible in every home lab with proto-PCB capability.

Pressure, temperature and humidity sensor board with RS485 – [Link]