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20 Mar 2015

2014-12-19+16.20.02

by vaupell:

I am experimenting with RF and IR signals in various frequencies and had some trouble with the receivers and needed to see what kind of signal i was receiving. I cannot afford a real oscilloscope but i knew about the older Arduino oscilloscopes.

After trying many different versions of code and tutorials, I was unable to get a single one to work, and all the tutorials and guides around was 2-3 years old. Not sure if it is the IDE or the actual hardware that has changed in such a way that it didn’t work anymore.

I finally found a working oscilloscope from a Japanese website, (linked below) and a working TFT screen library, meaning i could read the various signals received.

A simple DIY Oscilloscope with Arduino Uno and Mega - [Link]

20 Mar 2015

fingerpiezosensor

by ohnitsch.net:

While trying to create a circuit that detects whether water is flowing through a pipe by measuring the vibration with a piezoelectric sensor, just to see what happens I taped the sensor around my finger and – to my surprise – got values that were a very noise-free representation of my heart rate!

Measuring Heart Rate With A Piezo - [Link]

20 Mar 2015

Mini_Stereo_Audio_Amplifier

The dual low power amplifier built around TDA2822 8pin DIP. IC, it is mainly designed to use in portable players, radios and other building block project. A 3V supply can be used to drive headphones providing 20mW in 32 Ohms per channel, and a 12V power supply will provide 1W in 8 Ohm per channel for small loudspeakers.

Mini Stereo Audio Amplifier - [Link]

20 Mar 2015

6.5W_Stereo_Audio_Amp

The 6.5W Stereo Audio Amplifier project built around TDA2004 IC. The TDA2004 is a class B dual audio power amplifier, specifically designed for car radio applications etc.

6.5W Stereo Audio Amplifier - [Link]


20 Mar 2015

10W_Stereo_Amplifier_PIC

The project built around Philips TDA1521 IC, The project provides high quality audio 2X10W Audio output. The device is especially designed for mains fed applications, (e.g. Stereo TV Sound and Stereo Radio). The circuit designed for asymmetrical power supply systems.

10W Stereo Audio Amplifier - [Link]

20 Mar 2015

NICAD_NIMH_BATTERY_MONITOR

The simple project can be used as test gear. Its easy way to monitor the battery voltages, especially dry cell, NICAD, NIMH, supply up to 1.5 Voltage. Battery Monitor range 0.15V to 1.5V. The project is built around Texas instruments LM3914, The LM3914 senses the voltage levels of the battery and drives the 10 light emitting diodes based on the voltage detected on input connector. Circuit works on 5V DC. J1 Jumper is used to select the DOT mode or bar graph mode.

NiCad-NiMh Battery Monitor - [Link]

19 Mar 2015

FTDERE0I7CCFR2H.MEDIUM

by mi.vasilakis @ instructables.com:

Today I will show you how to make your own arduino compass by using the MHC5883L 3-axis digital compass board.

I prefer to build my own arduino based circuit by using the ATmega328p uno possessor, but this is optional for you. Buttons are used for turn on or off display leds and to change display mode of compass.

Arduino Digital Magnetic Compass – HMC5883L - [Link]

19 Mar 2015

Fairchild_FL7734

Fairchild announced the FL7734 Phase-Cut Dimmable Single- Stage LED Driver, a highly integrated LED controller solution for low-cost, and highly reliable LED lighting solutions from 5 W to 30 W. The FL7734 enables designers to quickly achieve great light quality designs with high dimmer compatibility while integrating full power factor correction (PFC) circuitry to meet power factor (PF) and total harmonic distortion (THD) requirements.

The FL7734 solution uses Fairchild’s unique active dimmer driving technology to eliminate visible flicker or shimmer symptoms and deliver over 90% dimmer compatibility with a variety of leading edge, trailing edge and digital dimmers from a wide range of manufacturers. The solution fully meets NEMA SSL 7A-2013 & ENERGY STAR® standards and provides a programmable dimming curve and input current management flexibility.

Fairchild Simplifies Dimmable LED Lighting Design - [Link]

19 Mar 2015

242229

Cabe Atwell @ eetimes.com:

There’s nothing better than “free” when it comes to just about everything, even PCB software. Just because some software is more expensive doesn’t make it better than some of those free PCB packages found on the Internet. In this round up, we will take a look at some of the past popular platforms that are still consistently being supported and updated. One criteria… some sort of update has to be present on the software’s support website in the last two years.

First on our list comes from Mirko Bruno Sortini with his ZentiPCB platform, which features several freeware programs to help users design their own PCBs. ZentiCapture allows users to quickly and easily design schematics using an easy-feature tool set, which allows users to place parts (component symbols) using the orthogonal locking and snap to pin. Once the schematics (in netlist form) are finished, they can then be ported over to ZentiPCB.

10 free PCB CAD programs - [Link]

19 Mar 2015

6752

by Susan Nordyk @ edn.com:

Intended to drive logic levels of 3.3 V down to 1.8 V, the LTC6752 comparator from Linear Technology achieves fast rise and fall times of 1.2 ns and a toggle frequency of 280 MHz, making it one of the fastest CMOS-output comparators on the market. The device exhibits a propagation delay of only 2.9 ns and overdrive dispersion of just 1.8 ns. Jitter is 4.5 ps for a 100-mV pk-pk, 100-MHz sinusoidal input, and the outputs swing to within 200-mV of the rails with up to 8 mA of load current.

The LTC6752 offers five options in different packages with unique combinations of features, such as separate input and output supplies, low-power shutdown, output latch, adjustable hysteresis, and complementary outputs. Inputs extend beyond both rails, which is useful for single-supply operation. All five variants of the LTC6752 are capable of driving 3.3-V and 2.5-V logic. Three versions have separate input and output supplies, decoupling the input and output voltage levels and enabling them to drive 1.8-V logic.

High-speed comparator cuts delays to 2.9 ns - [Link]



 
 
 

 

 

 

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