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20 Jun 2014

.PCB_heatink_m

by limpkin.fr:

Have no fear… even if this project sounds complex, you’ll easily learn in this article many things about high speed electronics and PCBs. In fact, my goal here is to teach you some basics about all the new problems that arise when you’re dealing with GHz signals

Amplifying nanosecond pulses for quantum physics experiments - [Link]

18 Jun 2014

This Photodiode based Alarm can be used to give a warning alarm when someone passes through a protected area. The circuit is kept standby through a laser beam or IR beam focused on to the Photodiode. When the beam path breaks, alarm will be triggered. The circuit uses a PN Photodiode in the reverse bias mode to detect light intensity. In the presence of Laser / IR rays, the Photodiode conducts and provides base bias to T1.

The NPN transistor T1 conducts and takes the reset pin 4 of IC1 to ground potential. IC1 is wired as an Astable oscillator using the components R3, VR1 and C3. The Astable operates only when its reset pin becomes high. When the Laser / IR beam breaks, current through the Photodiode ceases and T1 turns off. The collector voltage of T1 then goes high and enables IC1. The output pulses from IC1 drives the speaker and alarm tone will be generated.

A simple IR transmitter circuit is given which uses Continuous IR rays. The transmitter can emit IR rays up to 5 meters if the IR LEDs are enclosed in black tubes.

555 Photodiode alarm - [Link]

31 May 2014

This Photodiode based Alarm can be used to give a warning alarm when someone passes through a protected area. The circuit is kept standby through a laser beam or IR beam focused on to the Photodiode. When the beam path breaks, alarm will be triggered. The circuit uses a PN Photodiode in the reverse bias mode to detect light intensity. In the presence of Laser / IR rays, the Photodiode conducts and provides base bias to T1.

The NPN transistor T1 conducts and takes the reset pin 4 of IC1 to ground potential. IC1 is wired as an Astable oscillator using the components R3, VR1 and C3. The Astable operates only when its reset pin becomes high. When the Laser / IR beam breaks, current through the Photodiode ceases and T1 turns off. The collector voltage of T1 then goes high and enables IC1. The output pulses from IC1 drives the speaker and alarm tone will be generated.

A simple IR transmitter circuit is given which uses Continuous IR rays. The transmitter can emit IR rays up to 5 meters if the IR LEDs are enclosed in black tubes.

555 Photodiode alarm - [Link]

26 May 2014

20140519155058-vocore

VoCore is an open hardware runs OpenWrt. It has WIFI, USB, UART, 20+ GPIOs but size is only one inch. It helps you make a smart house or study embedded system.

VoCore is a coin-sized Linux computer with wifi. It is also able to work as a full functional router. It runs OpenWrt on top of Linux. It contains 32MB SDRAM, 8MB SPI Flash and using RT5350(360MHz MIPS) as its heart. It provides many interfaces such as 10/100M Ethernet, USB, UART, I2C, I2S, PCM, JTAG and over 20 GPIOs but its size is less than one square inch(25mm x 25mm).

VoCore: A coin-sized Linux computer with wifi - [Link]


21 May 2014

The Narrative Clip is an automatic lifelogging camera you clip to your shirt, bag, or anything else. What’s inside this charming little square? [via]

Narrative Clip Teardown - [Link]

17 May 2014

grillino-600x509

Mastro Gippo writes:

I just finished wrapping up an article about a small project I did in Shenzhen during the HackerCamp with Ian. I hope you find it interesting and feature it! :)

Making stuff in Shenzhen – The Grillino - [Link]

6 May 2014

DI5454f1

by Roy McCammon:

The traditional three op-amp differential amplifier’s signal to noise ratio can be improved by 6dB by adding a resistor and slightly changing the connections. There is a trade-off though: The traditional topology has a high input impedance, whereas the low-noise version has a lower input impedance.

Differential amp has 6dB lower noise, twice the bandwidth - [Link]

3 May 2014

13904018080_6d2b97282f

Ioannis Kedros writes:

Another quick project for today! How all started? A few hours ago I took a delivery box with few high resolution LCD’s on it. The box was made of foam material and was covered with dirty (from the delivery across two continents) yellowish tape.

To begin with, in order to open the box I had to remove half of this tape and by “playing” with the box I manage to remove everything without to damage it! Yes, the tape was strong enough to tear apart everything! The result is the one below

Rescuing a foam box - [Link]

2 May 2014

By Tessel Renzenbrink:

David Hunt built himself a working mobile phone using a Raspberry Pi and off-the-shelf components. The main building parts are the $35 Adafruit Touchscreen interface and a $48 SIM900 GSM/GPRS module for making phone calls. In total the phone costs $158 to build.

PiPhone: Turning Your Pi into a Phone - [Link]

25 Apr 2014

APlus Mobile Inc MotherBone PiOne with BeagleBone Black installed

MotherBone™PiOne™ is a peripheral motherboard for BeagleBone Black & Raspberry Pi providing safe I/O expansion for Linux based systems

We were evaluating BeagleBone Black and Raspberry Pi for low cost control systems when we discovered that the modules, as shipped, were fundamentally unusable for anything other than connecting to your PC and programming.

[..]

We created a multi-tool: an all-in-one 3.5″ peripheral voltage isolating motherboard for the BeagleBone Black and Raspberry Pi Model B computers and expanded out and isolated all of the default configuration pins that were not being used by BeagleBone Black internal resources. We also created two different on-board communication links between Raspberry Pi and BeagleBone Black for advanced control functions. Now you are able to run both modules individually or simultaneously in the real world.

MotherBone PiOne on Kickstarter - [Link]



 
 
 

 

 

 

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