3A Unipolar Stepper Motor Driver


This tiny Unipolar stepper motor driver has been designed around SLA7078MPR IC from Sanken, It is unipolar stepper Motor driver can handle current up to 3 Amps, micro-stepping up to 1/16 steps. On-board Jumpers to set the Micro-stepping, Preset (Potentiometer) to set the current.

The SLA7070MPR series motor driver ICs features unipolar drivers. The clock-in type input interface allows simplified control logic, and options for built-in sense current detection and load circuit short or open protection (patent pending) provide lower loss, and lower thermal resistance.

The built-in excitation distribution circuit (sequencer) allows motor control using only the CLOCK signal for simple operations (rotate/stop), with motor speed control by frequency input into CLOCK pin. This eliminates logic signal lines required for conventional phase-input methods, and reduces demand on heavily-used CPUs.

Unipolar stepper board is high efficient stepper driver for Unipolar stepper motor been design for various application like robotics, control routers, lathes, mills, PCB drillers and engravers.

3A Unipolar Stepper Motor Driver – [Link]


Arduino Digital Capacitance Meter


by braulio777 @ instructables.com

This project lets you measure capacitors in an alone range of measure from 0.000pF to 1000uF. That is, a 16×2 LCD Display will be displaying a sole scale from 0.000pF to 1000uF whose main components will be an Arduino Uno and a 16X2 LCD Display.

Arduino Digital Capacitance Meter – [Link]

Understanding bioelectricity


by Maurizio @ dev.emcelettronica.com:

Our body is built with biological tissue. The tissue that can generate or detect bioelectrical signals is called excitable tissue. Some examples of this tissue (and its cells) are: neurons and muscular tissue. Neurons are responsible of transmitting the excitatory bioelectrical signal to another neuron (forming nerves) or to a muscle tissue, gland or brain, while muscular cells are responsible of muscular contraction and distension. Some specialized cells generate bioelectric signals: optic receptors (eyes), muscular cells that transmit the feeling of pain, etc. Bioelectricity concerns the magnetic and electrical fields produced by organisms or cells.

Understanding bioelectricity – [Link]

Teardown & analysis of a Keysight InfiniMax III N2802A 25GHz active probe

A teardown & analysis of a Keysight InfiniMax III N2802A 25GHz active probe from TheSignal Path:

In this episode Shahriar takes a close look at one of Keysight (Agilent) InfiniMax III active probes. The model N2802A offers 25GHz of analog bandwidth, 17.5pS of rise time and a total differential input capacitance of 32fF at 10k-Ohm input impedance. The front-end amplifier of this active probe is designed in an in-house InP process, the same process responsible for the front-end of the X-Series Keysight oscilloscopes.
The teardown of the probe shows the control circuitry in the main probe body built around a PIC 16F877 microcontroller coupled to a DAC, EEPROM memory and various high-current and precision op-amps for biasing. The main front-end microwave module reveals the InP ASIC and supporting microwave circuity. There seems to be a dual-path design to provide a large DC common-mode offset capability as well as a high-bandwidth.

Teardown & analysis of a Keysight InfiniMax III N2802A 25GHz active probe – [Link]

Sound to light effect


Audio Dancing LED project is a fun filled project which generates a LED dancing sequence depending on the audio level it senses.  This project is based on one of the VU Meter IC LB1403 or CA1403


  • Power supply input 6 to 9 VDC
  • Output 5 LED’s
  • Onboard preset to adjust audio level to the IC
  • Onboard microphone capsule with Preamp
  • Terminal pins for connecting power supply input
  • Four mounting holes of 3.2 mm each
  • PCB dimensions 39 mm x 67 mm

Sound to Light Effect – [Link]

Arduino Motorized SMT Solder Paste Dispenser


by zapta @ thingiverse.com:

This is a motorized solder paste dispenser for soldering SMT boards. The home directory of this project is on github here https://github.com/zapta/misc/tree/master/paste_injector and it include hardware and firmware design of a compatible controller board that is Arduino compatible (it looks to the Arduino IDE as an Arduino Pro Mini).

Arduino Motorized SMT Solder Paste Dispenser – [Link]


SOS webinar – Simple and efficient solution for wide voltage range applications


Term: 2015.11.25 10:00 – 11:30 CET

Learn more about available topologies for input voltage higher and lower from output level. Focus on the most efficient way to convert power in four-switch buck-boost topology.

  • available topologies of Vin min < Vout < Vin max and differences between them
  • four-switch buck-boost topology as the most efficient, flexible and the smallest solution
  • buck-boost solutions from Linear Technology, applied to real end-devices
  • Diskusia

SOS webinar – Simple and efficient solution for wide voltage range applications – [Link]

Warning LED Flash Light


LED Flasher is a simple project producing a flashing effect of six LED’s.  This project can be used in all areas where you want to draw attention.  Hi-glow LED’s providing enough flashing light to attract your attention. Can be used as warning light.


  • Supply input 12 V @ 35 mA (6 to 15V Dc Possible)
  • Onboard preset to adjust flash rate
  • Terminal pins for connecting supply input
  • Four mounting holes of 3.2 mm each
  • PCB dimensions 53 mm x 35 mm
  • CN1: Supply in 12V DC (6V-15V Supply Possible)
  • PR1 : Flash Frequency Adjust

Warning LED Flash Light – [Link]


Kicad StepUp – export kicad 3D board


kicad StepUp allows exporting kicad 3D board and comps in STEP AP214 .By easyw @ sourceforge.net:

kicad StepUp: a new approach to export kicad board and modules in STEP AP214 (with colors). With kicad StepUp, it is possible to work in kicad EDA with the same component model data available in the STEP AP214 3D format, and obtain a 3D STEP AP214 model of the pcb board and a complete board assembles with electronic modules, to be used for MCAD interchange. The accurate 3D visualization of components on board assembles in kicad 3dviewer, is maintained in the same accuracy and aspect in STEP AP214 format. The kicad StepUp script maintains the usual way to work with kicad, but improves the process to work in a collaborative way with mechanical designers bringing near ECAD and MCAD environments.

Kicad StepUp – export kicad 3D board – [Link]

Pixie – 3W chainable smart LED Pixel


Ytai Ben-Tsvi @ ytai-mer.blogspot.com build a PIC based 3W LED Driver that is chainable. He writes:

LED Pixel: The Pixie is a color LED module, allowing an external controller to change its color and brightness dynamically.
Chainable: The module is designed so that you can chain many of them and control each one individually. If you know NeoPixels, this concept should be clear, but in case you don’t, imagine you want to build a project that requires 50 LEDs to be individually controlled. Naively, you would need to power each on of them individually, then connect each one of them individually to a controller. This would require tons of wiring, many pins on the controller, each one possibly driven by a specialized peripheral, such as UART or PWM. In short, this is not practical. With the Pixie, being chainable, you connect the first LED’s input pins to power and a single control pin (serial TX) on the controller. Then you connect the first LED’s output pins (power, ground, data) to the input of the second LED, and so on. Each Pixie in the chain consumes its own data, then relays the rest of the data down the chain, so the controller can control each Pixie individually, without being connected to each one.

Pixie – 3W chainable smart LED Pixel – [Link]