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  1. You will need to convert your AC voltage to RMS voltage then feed it to ICL7107. Datasheet has such a circuit on page 14. I attaching it here for your reference. The connection to the display is as the second attachment.
  2. Thanks for introducing us to your project! I featured it on the blog. Good luck with your crowdfunding.
  3. admin

    introduction

    Welcome on board, feel free to post about your project and questions.
  4. 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
  5. I managed to open it with Sprint-Layout 5.0. Just rename the files in English and it will open.
  6. 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.
  7. How many digital IO lines do you have on your microcontroller? and how many LEDs do you want to drive?
  8. Here are two SPICE models found online that will simulate the main IC functions including:- a) bar/dot mode selection, 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
  9. There are various components testers on ebay. You can check here: http://www.ebay.com/itm/M328-LCD-12864-Transistor-Tester-DIY-Kit-Diode-Triode-Capacitance-LCR-ESR-Meter-/141884915298?hash=item2108fffe62:g:uNYAAOSwGotWozua http://www.ebay.com/itm/TS-M8N-Transistor-Tester-Multi-functional-LCD-Backlight-Diode-Triode-Meter-N14D-/141813357437?hash=item2104bc1b7d:g:mGkAAOSwA4dWMDgN http://www.ebay.com/itm/ESR-Meter-Digital-Transistor-Tester-Diode-MOSFET-diode-Capacitance-MOS-PNP-NPN-/331509292666?hash=item4d2f7e5e7a:g:D4oAAOSwstxVCujN What exactly are you looking for?
  10. 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
  11. It would be helpful if you provide a schematic on how the LM2596 are connected together.
  12. Thanks for sharing your app with Elab. I featured it on the blog section: http://www.electronics-lab.com/hobbyist-electronic-inventory-system/
  13. The closest circuit to this one we have is this: http://www.electronics-lab.com/project/digital-stopwatch-0-60sec/
  14. That's good news! I am happy to see that the issue is resolved now.
  15. 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.
  16. 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.
  17. I have increased attachment size to 25MB. You can try to upload it again here.
  18. 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
  19. There is some similar software out there: VeeCAD Stripboard Editor - http://veecad.com VeroDes - http://www.heyrick.co.uk/software/verodes/ Stripboard Magic - http://www.marlwifi.org.nz/other/stripboard-magic LochMaster - http://www.abacom-online.de/uk/html/lochmaster.html
  20. Hello and welcome, It would be helpful if you post here some of the circuits you found that are close to what you are looking to build. What is the distance that the transmitter needs to be from the receiver to trigger the alarm?
  21. I am suggesting to have a reader in place where the pieces will be placed and each piece will have an RFID tag attached. So when the piece come close to the reader it will register itself. Each RFID has it's own ID and will not interfere with each other piece and will interact with the reader only. The only issue i see is if one piece is placed in the range of the reader and another piece is coming in. In this case maybe the reader maybe gets confused, but this is something to be tried.
  22. Is there one specific place where the pieces are placed? or distributed across the board? If't it's one you could use RFID technology but again the constrain is your pieces as they are small. The smaller RFID tag i found is 25mm in diameter.
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