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  1. Hero999

    What's happened to all the posts since 24 February?

    Since the forum upgrade, all posts made since 24 February have vanished. What went wrong?
  2. Hero999

    People shouldn't be able to delete a thread they've receive replies!

    I've noticed that it's possible to create a thread and delete it, after others have replied, even if you're not a moderator. This is not a good thing because it means someone could ask for help, then delete the thread when they don't like the answers, even though people have spent time replying...
  3. Hero999

    Make it impossible for non-moderators to lock their own threads.

    Someone made a thread asking a question but accidentally locked it so no one else could reply to it. This is bad because it could mean people could post something to annoy others, then whine and lock their own thread when they don't like what they say. To demonstrate this, I've locked this...
  4. Hero999

    5 LED ring oscillator sequencer.

    Here's another circuit I've built recently, it's nothing new, a ring oscillator connected to some LEDs so they flash sequentially. It can also be used to make a traffic light sequence: red, red+amber, green, amber, red by connecting the LEDs up differently. Attached is the schematic and a...
  5. Hero999

    1.5V buzzer circuit

    I came up with this circuit yesterday, it's basically an h-bridge and astable multivibrator in one. I've not actually built it yet but LTSpice says it works all the way down to 0.9V, making it ideal for single cell operation. The saturation loss for both transistors ranges from 184mV to 224mV...
  6. Hero999

    Solar powered Light

    I had an idea when looking at the Joule Thief circuit in the other thread. I thought, it should be fairly easy to convert it into a solar powered light by adding a few components. When light shines on the solar cells, the battery charges and when it's dark the Joule Thief circuit fires up...
  7. Hero999

    Design new 0 to 30V power supply.

    As you all probably know, the 30V power supply project on this site has many errors and design flaws. I'm thinking about designing a new one from scratch but before I do, I'd like to know whether anyone will test it for me? It's not something I want to build myself because I don't need it. I...
  8. Hero999

    DO NOT ASK THE SAME QUESTION MORE THAN ONCE! It will be deleted!

    Asking the same question more than once does not increase your chance of a helpful response but only reduces it as people get annoyed at having to read the same thing over and over. Seriously, if I asked you the same question three times would your answer be any different the third time round...
  9. Hero999

    Remove the Sell/Buy electronics - Job offer/requests section?

    It always seems to be abused by spammers advertising their cheap Chinese crap rather than genuine hobbyists who want to get rid of their old test equipment or surplus components.
  10. Hero999

    When asking for help: Post a link to the project!

    When you need help with a project on this site, please help us to help you by posting a link to the project. There are hundreds of projects on this site; most people aren't going to bother searching through them to find the one you're talking about, more often than not your post will be...
  11. Hero999

    Content Encoding Error

    I get the following error when downloading image attachments: Content Encoding Error The page you are trying to view cannot be shown because it uses an invalid or unsupported form of compression. I am using Firefox 3.5.4.
  12. Hero999

    Re: 600 WATTS LM4702 POWER AMP

    I've never understood why people incorrectly copy circuits from datasheets and pretend they designed them when it makes it obvious that they don't know how it works.
  13. Hero999

    Attack site

    It seems like Electronics Lab has been reported as an attack site. Every time I visit this place I get the following warning from Firefox, see attached. I wonder if this is because of the amount of spam that the bots post here? One thing I have noticed is that this site does seem to be slower...
  14. Hero999

    My latest PCB.

    Attached are some pictures of the PCB for a noise generator I'm currently building. I used the toner transfer process with magazine paper. For the silk screen I covered the toner with a thin conformal coating to stop it from being scratched off. It isn't perfect but it's good enough for me -...
  15. Hero999

    Re: Ldi/dt of an inductor

    Because that's what inductors do: they try to keep the current constant. Think of a flywheel: difficult to get spinning and hard to stop once spinning. An inductor stores energy in the form of a magnetic field which takes energy to build and releases energy when it collapses. When there's no...
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