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  1. Hero999

    Transformer data

    It's not a standard part. Most transformers have mains voltage primary (typically 110V or 230V) not 24V. Yes, it should be easy to measure them with a multimeter: the secondary with the highest current rating should have the lowest DC resistance.
  2. Hero999

    Programmable Home Security Alarm System.....need help!!!!

    Silly question. Off course Microchip won't write your program for you (unless you pay them lots of course). It's something you've got to do yourself.
  3. Hero999

    Transformer data

    I agree, it's confusing. The transformer appears to have four windings: a 24V primary and three 15V secondary windings, two rated to 15mA and one rated to 40mA.
  4. Hero999

    QM20TD-H For 3 Phase Inverter

    http://pdf.dzsc.com/QM2/QM20.pdf What's the trigger voltage? Post a schematic.
  5. Hero999

    Electromagnetism Exercise

    What parts of the questions are you struggling with? Have you attempted them yourself?
  6. Hero999

    Electromagnetism Exercise

    The link doesn't work. What do you want us to do about it?
  7. Hero999

    12v to 230 volts dc with voltage doubler circuit its possible?

    No you can't achieve a very high current. Regardless of the capacitors used, the 555's maximum output current is 200mA, which limits the maximum current from the circuit to 100mA, at which point there will be a large voltage drop.
  8. Hero999

    Burnt Resistor ! ! !

    You need a copy of the schematic or at least to reverse engineer the part of the circuit surrounding the resistor.
  9. Hero999

    jbl creature very low sound

    Sorry, I don't know what you're talking about.
  10. Hero999

    Types of nonlinear loads?????

    You forgot to say what your question is.
  11. Hero999

    Infrared project question - how to reduce illumination

    Of course you can. Why would you think otherwise? What do you think?
  12. Hero999

    40V,16A switching

    Please post a schematic.
  13. Hero999

    40V,16A switching

    Why do you need to switch it so fast? Is 100ns the minimum on, off time or both?
  14. Hero999

    Found a semiconductor Datasheet search, SMD Marking Web site

    What thank you for spamming the forum with some dodgy Chinese site probably selling fake components? Cheeky sod.
  15. Hero999

    How much, in general, Infrared LED's power consum ?

    Without a part number or datasheet there's no way of knowing. Generally infra red LEDs have a higher current rating than visible LEDs because their forward voltage is lower (1.1V to 2.5V, as opposed to 1.8V to 4.5V) and the maximum rated power dissipation is similar.
  16. Hero999

    Power Pack

    Don't worry, it's normal for a power supply to have a slightly higher voltage when unloaded. If you connected the laptop and turn it on, you'll probably find the voltage drops to within 19V or so.
  17. Hero999

    Power Pack

    No, it shouldn't be a problem.
  18. Hero999

    New electronics hobbyist looking for good projects to start on!

    Why would anyone want to go there? It's just a load of crappy circuits copied from other sites, nothing new nor innovative.
  19. Hero999

    negative ioniser

    I don't know which circuit will work best for you, try them both.
  20. Hero999

    Will this colour sensor work with multiplexer?

    It seems like an overly complicated way of doing this. I think you should drop the MUX and three channel photodiode, use a single channel photodiode and turn the LEDs on, one at a time and take an intensity measurement for each colour.
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