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  1. Hero999

    How does this simple circuit operate?

    No because it's not powerful enough to power an incandescent lamp. If you need to run a small incandescent lamp from a single AA battery then buy one which is rated to 1.2V
  2. Hero999

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

    I'm getting fed up with this. Recently someone created a thread asking for help so I responded, then they deleted their thread. Well I don't care whether you do anything about this or not. If anyone deletes their thread, after someone has replied to it, I'll undelete it and send them a polite...
  3. Hero999

    Please help me with High Low voltage cutoff with time delay

    The circuit is horribly drawn. I see not need for a 555 timer, three comparators could be used allowing you to use a single LM339. The questions are what are the voltage limits and the time delay? A simpler option is to use an RC filter so the delay is dependant on the magnitude of the...
  4. Hero999

    help please

    It looks like a surface mount resistor.
  5. Hero999

    help please

    I would do if the link wasn't broken. Please attach the file by clicking additional options.
  6. Hero999

    How does this simple circuit operate?

    Google for Joule Thief and if that doesn't answer your question Google for blocking oscillator.
  7. Hero999

    keybord !!!

    Clean it, perform a continuity and insulation check on the cable. If it still doesn't work, throw it away and buy a new one. Keyboards are cheap and are not worth repairing.
  8. Hero999

    Help designing "light detector" circuit.

    Why can't you simply run a cable? It needs no batteries, transmitter etic. The problem is filtering out daylight so it only detects the tail light. With an IR remote control system, the transmitter is pulsed at a certain frequency so a bandpass filter can be used to remove sunlight and 100Hz...
  9. Hero999

    LC filters

    No, there's no need to filter out just 10mV of ripple.
  10. Hero999

    Energy conversion.

    What are you getting at? Sound is already a form of mechanical energy.
  11. Hero999

    question about Low Pass Filter

    Why? 4.7nF and 6.8nF capacitors will be non-polarised anyway so that's a silly question.
  12. Hero999

    Solar and Batteries and LED's questions

    It's difficult to say since you don't know what's going on inside the controller. It sounds like it's float charging but that doesn't mean the batteries will be fully charged because float charging takes a long time to fully charge batteries. What voltage do you actually measure across the...
  13. Hero999

    newbie

    If you're going to be like that no one will help you. I couldn't give a toss whether it's an electronic or a geography project no one's going to simply do your work for you and no you didn't make it clear that you wouldn't mind using an off the shelf unit. It's totally unreasonable for you to...
  14. Hero999

    newbie

    If it's for a school project, the whole point is for you to design it yourself. You don't need to know much about electronics to simply solder stuff together, for example children working in Chinese sweatshops build many radios day without knowing anything about how they actually work. The...
  15. Hero999

    DC-DC BOOST CONVERTER

    Please post a schematic. What are you using for feedback or is this an open loop design?
  16. Hero999

    eletronic simulation

    Thread moved to the relevant section. You need to learn how to use Google. http://www.google.co.uk/search?q=electronic+simulation+software&ie=utf-8&oe=utf-8&aq=t&rls=org.mozilla:en-GB:official&client=firefox-a
  17. Hero999

    Transistor amplifier questions

    A common emitter amplifier is normally used as a signal amplifier not a power amplifier. It depends on what you mean by high frequencies.
  18. Hero999

    Parallel LC

    Yes, Google LC oscillator for more information.
  19. Hero999

    Transistor amplifier questions

    You might get more help if you use a more descriptive thread title so I've renamed the thread for you. Are you talking about common emitter or a common base amplifier. It's probably a good idea to post a schematic to avoid confusion. Click additional options, attach to post a file, PNG of GIF...
  20. Hero999

    resistors

    I explained all of that, reread my previous post.
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