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  1. Hero999

    ATTENTION: Illegal content (ebook/magazines/software) will be deleted

    Read the license agreement to find out whether it's legal to redistribute it or not. If it doesn't have a license agreement assume you can't post it here unless you've sought permission from the copyright holder. You can upload your own avatar be clicking on the profile information section in...
  2. Hero999

    Water Level Indicator

    Use a pot and ball cock to give a varible voltage depending on the depth. Use some comparators such as the LM339 to light the LEDs depending on the input voltage.
  3. Hero999

    Simple Question

    Your question makes no sense and a poll is equally pointless. Be more specific: what do you want to know? And turn off the capslock key.
  4. Hero999

    resisitor value

    You won't get 91.1k because it's not a standard value and at 10% tolerance it's impossible.
  5. Hero999

    Sansui AU 2900 amp service manual wanted

    If it's too big then upload it to a file hosting site.
  6. Hero999

    Is it a hartely oscillator??

    Yes and no doubt he'll ask the same question again and again.
  7. Hero999

    FET Amplifier Biasing

    It also has a variable oscillator and mixer to produce a fixed intermediate frequency so a high Q tuning circuit can be used to give excellant selecxtivity.
  8. Hero999

    FET Amplifier Biasing

    You should use a ferrite rod or loop aerial if you don't want to rely on an external earth connection.
  9. Hero999

    Doppler effect for visually impaired

    Please post in English.
  10. Hero999

    Making Connections

    By using a formula which can be found using Google. http://www.google.co.uk/search?hl=en&client=opera&hs=4eV&rls=en&channel=suggest&q=inductance+calculation&aq=f&aqi=g7g-m3&aql=&oq=
  11. Hero999

    Making Connections

    I've never done it before so wouldn't be able to answer that question. What's the resistance and inductance of the coil? You should ensure the impedance of the capacitors and wiring is significantly less than that of the coil.
  12. Hero999

    Electromagnetic application on hardware project

    I'd be very careful if I were you, playing with the braking system is not a good idea: if your project goes wrong it could cause an accident. There are practical problems too: the breaks will wear down very quickly and fuel consumption sky-rocket. You'd be better off cutting power to the engine...
  13. Hero999

    i wnat to make a circuit

    You haven't provided enough information. I made a battery charger to charge two 14Ah sealed lead acid batteries connected in series in my shed using an LM317 which just served to limit the voltage from the panels. The charge current was well within the specification of the battery.
  14. Hero999

    Depletion mosfet

    Why build a very inefficient class A amplifier when you can make an efficient class AB ampflieir which sounds as good? The only real use for a depletion power MOSFET is a normally open solid state relay.
  15. Hero999

    Electromagnetic application on hardware project

    Sorry no one's going to give you a project, the whole point is you design it yourself. If you make an effort and propose a design we might be able to point out where you've gone wrong and suggest improvements.
  16. Hero999

    Boost converter - MCU reset problem

    It sounds like you're not limiting the duty cycle so the inductor is saturating. Why not simply replace the light bulb with one designed to run on 12V? Using an SMPS to power something which can easily be changed to the correct voltage is bad design.
  17. Hero999

    Making Connections

    Just make the connections as short and as thick as possible. What are you using for back-EMF protection? Electrolytic capacitors don't like being charged in the reverse direction.
  18. Hero999

    Making Connections

    You really need to provide more information. It depends on the capacitance, voltage and rate of discharge.
  19. Hero999

    Is it a hartely oscillator??

    Not if the circuit is assembled correctly. C1 AC couples the feedback from the inductor to the transistor. I'd be surprised if this circuit works at all with R1 at 1M. The proper way is to bias the transistor with a potential divider.
  20. Hero999

    Help required for transmitter / receiver

    Did you click on either of the links in my previous post? One of the reasons you probably can't find any circuits is because there was no Internet when they were created. There are many ways to do this. One I can think of is to use two oscillators in the transmitter, each with slightly...
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