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  1. Hero999

    Remote contol buzzer/beeper

    You're right, this is not a simple project for someone with little experiance but shouldn't he be doing his doing his own homework? The modules need other circuitry to work. A good way of doing it is to use a microcontroller. Here's a link to a tutorial...
  2. Hero999

    Sata toUSB Converter

    If you're not qualified then look for a ready made solution from somewhere like Maplin or RadioShack.
  3. Hero999

    Flyback # promac cinemac 2000

    Sorry, I don't understand, please speak English. I think yuo've confused this place with a similar Filipino forum.
  4. Hero999

    1958 Hifi play MP3 - Can it be done ????.

    It's possible but it won't be easy. You'll need to have experience with programming microcontrollers. One way is to make your own MP3 player, as trying to interface with a ready made one will probably be very difficult.
  5. Hero999

    Project Spaceship for my boy

    The simplest way is to use blinking LEDs which just need to be connected to a battery via a series resistor.
  6. Hero999

    Transformer substitution Hi

    Yes you could but I think a 24V transformer is oversized. The LM7805 has a maximum voltage rating of 35V but using a 24V transformer,  the rectifier voltage when the circuit is unloaded and the mains voltage is on the high side can be above 35V. I'd recommend using a 9V transformer with a 3300
  7. Hero999

    Need help making a program to use in a lcd devise!!!!!

    It's called an iphone or a palmtop PC.
  8. Hero999

    slide pot?

    Or better still use PWM so a heat sink won't be required.
  9. Hero999

    TIP142 Stepper motor driver

    If you want help, post the complete circuit, including what is driving the transistors.
  10. Hero999

    Please help me with High Low voltage cutoff with time delay

    Sorry, I don't spoon feed people but I'll give you some more information.: Have a look for control panel transformers rated to 380V or 400V or look into using two standard 230V transformers in series with the secondaries in parallel. You'll obviously have to scale the rated voltage down to...
  11. Hero999

    RFID to web hardware design

    I'm sorry, I can't help you much. The looks like a suitable platform for this though.
  12. Hero999

    Please help me with High Low voltage cutoff with time delay

    The trouble with that is you need a to do some experimentation, unless you use a calibrated voltage measuring transformer. Using a general purpose transformer won't give you a predictable result because the regulation factor will be poor, for example a transformer with a primary voltage of 240V...
  13. Hero999

    suggestion for counter chip?

    How long does it need to go to 1 for? This should be trivial with a microcontroller, a low end PIC should do, e.g. PIC16F505 which has an 8-bit timer/counter built-in. All you do is loop the program until the counter reaches the desired value. You'll need to clock it at 20MHz (5MIPS) and make...
  14. Hero999

    How does this simple circuit operate?

    Everything glowed in the nightclub because it was lit with blacklights which are just fluorescent lamps which emit long wavelength UV. I've never tried it myslelf but I've heard that UVA appears pink when looked at with a CCD in a digital camera. What colour does the neon appear to you? It...
  15. Hero999

    In need of haier hi2011 datasheet

    The thread is two months old, somehow I dont' think he'll be back.
  16. Hero999

    How does this simple circuit operate?

    How large is the file? I just reread your post and noticed something else: The fact that it appeard pink on film but not when you're looking at it implies it's emitting invisible radiation, probably UV, try putting some white paper next to it to see if it glows blue.
  17. Hero999

    a cap vlue????

    What do you think?
  18. Hero999

    a cap vlue????

    It depends on the frequency of the lowest signal of interest. C = 1/(2πFR)
  19. Hero999

    How does this simple circuit operate?

    The neon is pink because it's ridiculously overdriven. The colour is different at higher currents because the lamp pressure will be higher and other gasses in the mix will be ionised. It works but for how long? The neon will eventually burn out. You didn't read my post properly, I didn't say it...
  20. Hero999

    How does this simple circuit operate?

    Well I don't see the point of the neon. If the current is low enough for the neon to light without blowing up, it will have a maximum current rating of something liek 10mA so it can't have a high enough current to charge a SLA. The neon could just as easily be replaced with an LED and it will...
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