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  1. Hero999

    where to find bright SMD LEDs

    They're not surface mount LEDs but through hole and the sopts you're talking about are the semiconductor LED dies themselves. How much current do the LEDs draw? You could build a tiny PCB with resistors and SMT LEDs but the trouble is building a nice convenient package for it.
  2. Hero999

    a microprocessor transistor hFE tester

    http://www.rapidonline.com/Tools-Equipment/Peak-Atlas-DCA-Semiconductor-component-analyser-36637
  3. Hero999

    Visual "end of cycle" indicator for a dryer

    I wouldn't recommend tapping into the dryer's electrical system. Although it would be a more complicated project, it's much safer to monitor the sound from the buzzer and trigger a relay.
  4. Hero999

    What is the function of this circuit?

    That circuit is wrong, the transistor is configured as an emitter follower with no gain so there'll be no oscillation. Here's a link to the correct version, with a better explanation: http://users.silenceisdefeat.net/~lgtngstk/Sites/Circuits/Buzzer/Buzzer.html It can be made louder by replacing...
  5. Hero999

    help with circuit simulation

    The motor will look like three inductors, each with a resistor in series, connected in delta.
  6. Hero999

    help with circuit simulation

    You haven't been provided with enough information to answer the question: without knowing the line frequency, it's not possible to solve the problem. You need to break the loads down into their inductive, reactive and resistive components: To calculate the resistance of the lighting circuit...
  7. Hero999

    help i want a 6-channel transceiver

    No I don't. So what do you want me to do about it? Do you want someone to design one for you? How much are you willing to pay? So far you haven't even given a proper specification, so how do you expect anyone to help you?
  8. Hero999

    Choosing a Mosfet to switch an Electric Match

    It's nothing to do with switching speed, a logic level MOSFET has a low threshold voltage so can be switched from 5V or less, a normal MOSFET usually needs 10V.
  9. Hero999

    Current through a coil in a DC circuit

    But I thought you were talking about DC current? Deriving the DC current is easy: you need to know the resistance and voltage and use Ohm's law. Calculating the AC current is also not difficult but you need to know the inductance too. A Hall effect sensor will work but for AC it'll need to...
  10. Hero999

    Choosing a Mosfet to switch an Electric Match

    http://www.google.co.uk/search?client=opera&rls=en-GB&q=MOSFET+BJT+advantages+disadvantages&sourceid=opera&ie=utf-8&oe=utf-8&channel=suggest Going from your previous posts, you need a logic level MOSFET. You don't need a 12W resistor, as the power dissipation will only...
  11. Hero999

    Opto Coupler Common Ground

    There is no point in using an opto-coupler, if both circuits use the same ground.
  12. Hero999

    help i want a 6-channel transceiver

    Nice project, assuming you really did build it yourself.
  13. Hero999

    help i want a 6-channel transceiver

    Robot spies: sounds interesting. Who are you spying on?
  14. Hero999

    Current through a coil in a DC circuit

    You need to know both the current and voltage,in order to calculate the resistance, for more information look up Ohm's law.
  15. Hero999

    help i want a 6-channel transceiver

    Why didn't you say that before? What's an Rbatm?
  16. Hero999

    help i want a 6-channel transceiver

    That's odd, it was working before, try this: http://buenotech.en.made-in-china.com/product/NewJdEgbyjkq/China-6-Channel-Digital-Fiber-Optic-Video-Transceivers.html
  17. Hero999

    help i want a 6-channel transceiver

    What do you mean? Please post in English.
  18. Hero999

    help i want a 6-channel transceiver

    http://www.huihongfiber.com/6-channel-video-optical-transceiver.html
  19. Hero999

    confuse about voltage and ampere

    This is the open forum. All my signature means is please ask questions here, not via private message/email.
  20. Hero999

    confuse about voltage and ampere

    No because the voltage isn't high enough to cause a large enough current to flow through you to harm you.
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