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  1. Hero999

    how to calculate the electric relative permittivity of fluid or medium.

    I would have thought it would be easier to measure the RC time constant, rather than phase difference. It's as simple as building a relaxation oscillator with Cx + the parasitics as the capacitor being tested and measuring the frequency which will be inversely proportional to the capacitance.
  2. Hero999

    Help on clap switch

    Try to figure it out for yourself. My description should give you plenty of clues. Post the circuit and I'll check you've got it right.
  3. Hero999

    URGENT help with my PIC16F628A project

    Have you asked your lecturer for help? Surely the purpose of the course is for you to write your own code? I hope you've included this site in your bibliography. Have you tried changing the IC?
  4. Hero999

    Help on clap switch

    The unlabelled diodes aren't critical. You could use the 1N4001, 1N4148, 1N4448, 1N914, BAV20 etc.
  5. Hero999

    4way Traffic light with left turn(left hand drive)

    The simplist method is to use a microcontroller so the timing can be adjusted by modifying the software.
  6. Hero999

    Power LED 1, or LED 2, or LED 3 with AND logic

    It can be done using combinational logic, composed of logic ICs or a programable device such as a microcontroller. In this case discrete ICs (CD4000 or 74HC series) or even transistors will do. Here are a couple of links to some tutorials...
  7. Hero999

    Infrared LED Lamp Switch Help

    How much power does the LED lamp use? Run the TSOP1738 and CD4017 from a 5V regulator and replace the relay with the LED lamp.
  8. Hero999

    DC converter 12V to 24V with dual outputs (+24V and -24V) w.r.t. input GND

    If you buy a 12V to 24V DC-DC with an isolated output, you can connect the +V out to 0V and you'll have a -24V supply.
  9. Hero999

    Sound Card Input

    Read the datasheet fro he sound card. Sound card oscilloscopes aren't good for much. They're limited to 2kHz and if you exceed the input voltage you can ruin your sound card or even motherboard. It's much better to buy a second hand oscilloscope.
  10. Hero999

    0-30V Stabilized Power Supply

    You seem to be determined to stop people from opening your file. Please use a universal format such as PNG or PDF so that veryone can read it.
  11. Hero999

    Help required for Fan Dimmer-Important

    I don't think lighting is responsible. The speed controller fails when run from the UPs because of the high voltage spike given off by the motor when the current is suddenly interrupted by the square edge of the modified sinewave. You could try a choke and smoothing capacitor but I don't think...
  12. Hero999

    Wireless Power transmission

    Sorry, you're wrong, Google for Tesla wireless power transmission EDIT: Thread closed by moderator because the original poster has never returned and it's just attracting spammers. If anyone thinks this is the wrong decision, please message me.
  13. Hero999

    Spammers and/or Advertisers out!

    i'm just a moderator so have no power to ban people. If i see a spam post I'll delete it but if I see loads of posts by the same spammer, I leave them for mixos to sort out as I see no point in wasting my time deleting them, when all they'll do is repost.
  14. Hero999

    Help required for Fan Dimmer-Important

    It's a phase speed controller which will not work from a UPS which produces a modified sinewave. You need to upgrade the inverter in the UPS to a pure sine wave type.
  15. Hero999

    SimUaid

    I've never heard of it an if you want pirate software then look elsewhere.
  16. Hero999

    Help required for Fan Dimmer-Important

    You forgot the attachment What's a fan dimmer? Don't you mean a fan speed controller?
  17. Hero999

    solar electric fence

    Here are a few products which should do what you want. http://www.grundyagricultural.com/products/energisers/hotline_p80s_helios_solar_electric_fence_energiser_-_0.8j?utm_source=google&utm_medium=merchant&utm_campaign=merchant...
  18. Hero999

    please i need help in designing a motion sensor with a camera and auto dialler

    Please provide more information.
  19. Hero999

    0-30V Stabilized Power Supply

    Why is that unusual? It's what you should expect. 24V is the RMS voltage, when fully loaded, the peak will be 34V, fully loaded, but when open circuit the voltage will be up to 20% higher so 50V sounds reasonable.
  20. Hero999

    A temperature clock display module made in holidays

    Looks nice. Could you please post the schematic and code.
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