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  2. Submit Projects, Articles

    in General

    Posted

    Hi Maleetronic,

    Thanks for your interest publishing a project on elab! I personally handle the project submissions and manually adding them to our repository after reviewing. So if you would like to submit your project the best way is to send me an email to webmaster @ electronics-lab.com or let me know here. After project submission i will handle the rest.

    Let me know, how i can help you further.

  11. Elektor GREEN Membership @ 50% OFF

    in Electronic Resources

    Posted

    elektor_logo.png

    Electronics-Lab.com team is always looking for partnerships that will benefit our members and bring some valuable offer to all of you. This time we would recommend an Elektor yearly subscription for half the normal price. With this offer you will gain access to thousands of articles and hundrents of projects. This is an exlusive offer for electronics-lab members and to benefit from the offer you just have to enter E-LAB16 code on this form. The offer is valid for Elektor GREEN Membership and costs US $37.50 (€34.00 / £24.48) for a year.

    What you get: 

    • 6 Editions of Elektor Magazine (132 pages each) in PDF format
    • Free access to all PDF editions of Elektor Business Magazine (approx. 6 per year)
    • Unrestricted access to the Elektor 2000 - present day archive (thousands of articles!)
    • Full access to over 750 Elektor Labs projects
    • A minimum of 10% discount on all products at Elektor.com

  13. OK.. So i have a difficult project...

    in Electronic Projects Design/Ideas

    Posted

    Hi and welcome to the forum,

    For what you describe you will need a light activated switch like this one: http://www.electronics-lab.com/project/light-and-dark-sensitive-switch/

    This switch has adjustable sensitivity and with a little of experimentation you will manage to get the desired effect. It may be needed to add a kind of filter to the light sensor to reduce it's sensitivity even further as you need the switch to be activated in direct sunlight. You can also think to add a small "light pipe" to achieve the desired functionality.

    Hope that helps.

  15. LM3914 pspice library

    in Spice Simulation - PCB design

    Posted

    Here are two SPICE models found online that will simulate the main IC functions including:- a) bar/dot mode selection, B) dot mode carry for cascaded ICs, c) resistor-programmed hi/lo reference voltages, d) output current selection, e) non-grounded V- and divider ladder, f) independent V+ and Vled, g) leakage current of outputs, h) segment overlap and i) supply current variation with V+ and Vref output load.

    This model is build by user "alec_t" at electro-tech-online.com forum.

    LM3914.zip

    LM3914asc.zip

  16. ELECTRONIC COMPONENTS TESTER

    in Sell/Buy electronics - Job offer/requests

  17. Transistor Substitute.

    in Datasheet/Parts requests

    Posted

    Hi,

    2SD613 NPN has replacement BD243C, BD543C, BD801, 2SD866 BD243C KT819G

    2SD633 is a NPN Darlington transistor and has replacement BD649, BD901, BDW73C, BDX53C BD649

    2SD600 has replacement BD139, BD230, BD379, 2SD1684 BD139

    2SB631 has replacement BD140, BD231, BD380, 2SA1184 BD140

     

     

  22. Humidity sensor

    in Datasheet/Parts requests

    Posted · Edited by admin

    According to Sensirion datasheet here SHT31-ARP-B is an analog output temperature and humidity sensor with linearized and calibrated output. To interface it with Arduino you will have to measure the output voltage using an Arduino analog input and then convert the reading to humidity or temperature value based on the linear formulas found on the datasheet. These formulas are depended on the supply voltage of the sensor.

    I also found an Arduino library for this sensor here: https://github.com/winkj/arduino-sht you may find it useful.

  23. Full Wave Bridge Rectifier

    in Projects Q/A

    Posted

    Sure it can be, you only have to feed an AC signal to it's input (form a transformer for example) and measure it's output using an oscilloscope. Oscilloscope probe and input will provide some load to the rectifier and thus you will be able to see the full wave rectification and determinate if the bridge is working.

  25. Ideas for Single AA and AAA batteries?

    in Electronics chit chat

    Posted · Edited by admin

    You could build a single cell LED boost driver like the third schematic here, using only 2 transistors. Or you can use ZXSC310 IC to build a boost LED driver working for as low as 0.8V input voltage like this schematic here: http://www.homemade-circuits.com/2012/05/1-watt-led-driver-circuit-using-single.html

    Alternative you can build a 1.2V to 5V boost DC-DC converter able to provide 1A max output current, like the second schematic here.

    For drained AA and AAA batteries you can build a Joule Thief that is able to draw the last available juice from the almost dead batteries. Like the first schematic here.

    http://www.homemade-circuits.com/2012/01/how-to-make-simplest-15v-bluewhite-led.html

    LED Driver (1).png

    HB-LED-for-Li-Battery-Operated-Systems1-1383181219.png

    Two-Transistors-Single-Cell-Battery-LED-Driver.gif

     

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