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  1. admin2

    Transistor Substitute.

    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
  2. admin2

    DC-DC converter

    It would be helpful if you provide a schematic on how the LM2596 are connected together.
  3. admin2

    Electronic Component Organizer App

    Thanks for sharing your app with Elab. I featured it on the blog section: http://www.electronics-lab.com/hobbyist-electronic-inventory-system/
  4. admin2

    how to construct a mod-60 stopwatch counter?

    The closest circuit to this one we have is this: http://www.electronics-lab.com/project/digital-stopwatch-0-60sec/
  5. admin2

    ANTI-AGING

    That's good news! I am happy to see that the issue is resolved now.
  6. admin2

    Humidity sensor

    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...
  7. admin2

    Full Wave Bridge Rectifier

    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...
  8. admin2

    8x8x8 led cube light

    I have increased attachment size to 25MB. You can try to upload it again here.
  9. admin2

    Ideas for Single AA and AAA batteries?

    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...
  10. admin2

    8x8x8 led cube light

    Would you mind sharing it here?
  11. admin2

    SOFT ROBOTIC FISH

    Maybe you can consider casting soft plastic or silicon, i think this would be ideal.
  12. admin2

    SOFT ROBOTIC FISH

    You need to be more specific about your project, so we can help.
  13. admin2

    PCB BUILD

    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
  14. admin2

    Sensor alarm and transmitter

    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?
  15. admin2

    Homemade game board detecting different player pieces

    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...
  16. admin2

    Homemade game board detecting different player pieces

    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.
  17. admin2

    Non motion sensing light activation

    The Electronics Project Design / Ideas section seems good. No reason to post it again here. Let's follow it there.
  18. admin2

    Accelorometer light project

    In this case i would recommend a microcontroller (programmable chip) that will continuously read an acceleration sensor in all three axes and if these values fall below a threshold for some time (you define it) the LEDs will flash. But to use a microcontroller, some knowledge of programming is...
  19. admin2

    Accelorometer light project

    Is this device going to be attached to someone (wearable?) or it will be in a distance from a person?
  20. admin2

    8x8x8 led cube light

    That's really cool! Can you give us some technical specification about your led cubes?
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