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  1. Hero999

    Fan Failure Alarm

    A low value resistor connected in series with the fan can be used to measure the current flowing through it. The voltage across the resistor, therefore the current, can be calculated using Ohm's law. Each fan will need to have its own current sensing resistor.
  2. Hero999

    Fan Failure Alarm

    What do you mean by internal detection? You could measure the current through the fan motors and if it's too high or too low, it's a reasonable indication that the fan isn't working properly. It's not as reliable as monitoring the air speed but it's better than nothing.
  3. Hero999

    555 dc motor controller

    Replace the Darlington with a MOSFET. The IRF3415 or IRL540 would do.
  4. Hero999

    0-30 Vdc Stabilized Power Supply

    Could you please post the schematic. Sorry if you've already posted it. This thread is 76 pages long and many of the links are broken.
  5. Hero999

    555 dc motor controller

    A schematic would help us to answer the question. I wouldn't recommend either. A MOSFET would probably be better.
  6. Hero999

    0-30 Vdc Stabilized Power Supply

    Which schematic are you building? The link on the first post in this huge topic refers to a 50V PSU and the schematic is very fuzzy and unclear. I take it you're building a different one?
  7. Hero999

    Microcontroller for my Project

    Yes there is. That's what R21 to R41 is.
  8. Hero999

    diodes

    If an AC signal is applied to either of those circuits, the capacitor will just charge up, then no current will flow, except that due to the diode reverse leakage and capacitance.
  9. Hero999

    Well, that was odd

    The new forum software has brought with it a few problems. Lots of the old posts, threads and attachments have gone and some users have experienced difficulty uploading attachments. http://electronics-lab.com/community/index.php?/topic/41121-about-file-uploading/&page=2#comment-157554...
  10. Hero999

    IC doesn't fit in pcb

    Of course the TDA7297 is not too small to fit on a PCB. Any IC can be mounted on a PCB, no matter how small. I think what he's saying is it's not the right shape to fit on a breadboard or stripboard. For a start don't even consider trying with breadboard, which isn't suitable as the current is...
  11. Hero999

    About file uploading

    Did you upload your avatar from your hard drive or somewhere else on the Internet? Usually I'd advise you install all the relevant updates for your browser and operating system but I'm able to post attachments from my work's PC which is running an old version of Firefox.
  12. Hero999

    "L6" - what kind of transistor?

    The sound card needs to form part of the circuit. Try this.
  13. Hero999

    "L6" - what kind of transistor?

    Where did you get the schematic from?
  14. Hero999

    0-30 Vdc Stabilized Power Supply

    Fortunately SMT to DIP adaptor boards aren't expensive. http://www.adafruit.com/products/1212 http://www.hobbytronics.co.uk/soic-dip-breakout-8-ht?utm_source=google&utm_medium=googleshopping&utm_campaign=googlebase&gclid=CJDy8piCnccCFYvKtAodJ9QMSA...
  15. Hero999

    About file uploading

    If you're still having problems with attachments, you could upload the schematic to another imaging hosting service and post a link to it here. http://tinypic.com/index.php
  16. Hero999

    About file uploading

    No I haven't done anything to the browser or PC.
  17. Hero999

    About file uploading

    Testing using Internet Explorer on Windows 7.
  18. Hero999

    About file uploading

    It's working now. Thanks.
  19. Hero999

    About file uploading

    It still won't allow me to post an attachment from my hard drive. Testing using Internet Explorer on Windows 7. Still no option to attach files from the hard drive.
  20. Hero999

    About file uploading

    I'm using Firefox 39 (the latest version) and cannot post attachments either.
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