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  1. Arouse1973

    Bonjour tout le monde!

    Bloody hell Kris, fluent in French also :eek: I can ask for a beer in German that's about it :)
  2. Arouse1973

    Lights when audio is triggered

    The strobes I am on about run from 12 Volts (House Alarm Strobe) so you could power them from a wall-wart PSU and switch them from the Arduino using either a transistor, relay or opto-isolator etc. I thought you wanted to use an Arduino? You can do it without but will be more complex. Adam
  3. Arouse1973

    Newbie with a power supply question

    And yes I was right, not much wire. :) Ok 100 mA is not enough current for that amount of wire. Tell us what thickness of wire you are using and I'll try and work out an example. Adam
  4. Arouse1973

    24V 2A Variable Power Supply

    I always like to have a bleed resistor across the output to ensure the capacitor is discharged. Adding the two diodes is a very good idea but there could be a residual voltage on the output when the diodes stop conducting. It won't be much and maybe of no concern but I thought I would mention it...
  5. Arouse1973

    Cuk converter ripple current

    The voltages seem a bit high for 5 and 12 Volt. Your circuit by the way is for a positive and negative PSU? I would be looking for a dual secondary transformer with two bridge rectifiers attached one for each output with separate smoothing capacitors. I would use high current Schottky barrier...
  6. Arouse1973

    Lights when audio is triggered

    Maybe something like this would do. The MOSFET would need to be a logic level type. I downloaded a bell WAV file and put this into the simulation. But you really need to see what the amplitude of the signal is first, you may need to adjust the component values but this is the easiest way I can...
  7. Arouse1973

    Lights when audio is triggered

    Hello. It might be as simple as a diode, capacitor and bleed resistor. So when the Bing Bong! sounds the capacitor charges through the diode and is bled off by the resistor. The bleed resistor ensures the Arduino has time to sense the voltage pulse and trigger the alarm. A flashing strobe...
  8. Arouse1973

    Newbie with a power supply question

    LOL yes brilliant story. Adam
  9. Arouse1973

    Newbie with a power supply question

    And to answer this question tell us how much wire did you use? I bet I can guess not much! What power supply are you using? What do you want to attract, a paper clip or a mini-bus full of kids. Tell us more about your project then we can help. Adam
  10. Arouse1973

    Cuk converter ripple current

    Sure give me time to have a look at this. Can you give me some official credit by liking the posts you liked. Adam
  11. Arouse1973

    LED lighting without power source

    Wow what lovely snow :) Yep think we have found the culprit. Although a wire carrying 60 Hz at 126 A(rms) will induce a voltage of 94 uV into a 1 m by 100 mm loop at a distance of 10 m. You have a lot of wires there each producing it's own magnetic fields which produce a vector sum of them all...
  12. Arouse1973

    LED lighting without power source

    Airs ability to hold moisture changes with temperature so it's resistance will change. It will increase when the temperature is lower, also as mentioned the LEDs forward drop could be a contributing factor but It depend on the change in temperature. In your picture I guess your lights run over...
  13. Arouse1973

    Cuk converter ripple current

    Here we go. I could simulate it for 40KHz so I made it up to prove the formula. You could put this all into Excel and make a spread sheet. Use all this first to make sure you have it right. The Vn004 graph is the voltage ripple on the cap. This is as far as I can go. Adam
  14. Arouse1973

    Cuk converter ripple current

    Let me see if I can do another full example for you. Give me some time. Adam
  15. Arouse1973

    Cuk converter ripple current

    Equivalent series resistance. It a property of a capacitor, it's the capacitors AC resistance measured at a certain frequency. For say the TAJ series of Tants it is 100 KHz.
  16. Arouse1973

    Cuk converter ripple current

    Ok I came up with this. The value seems a bit low, but I guess it would be for 1.2V ripple. It's late and I am tired so I will check it again sometime tomorrow if I have time. Adam
  17. Arouse1973

    Total Resistance of circuit, when there is current source

    I am guessing it is as Laplace stated, the equivalent resistance that would be seen by the battery? I know I said effective, I think equivalent is a better word. Adam
  18. Arouse1973

    Cuk converter ripple current

    Yes I thought that was quite high. I guess they are just getting you to work something out. For this forget anything to do with the inductor as this is smoothed by the cap. Have a look at how you would calculate the capacitor for a standard PSU with bridge diodes. Edit: For the inductor I...
  19. Arouse1973

    Total Resistance of circuit, when there is current source

    I thought the same Kris. I guess they mean effective resistance including the effect of the current source. But that's just a guess. Adam
  20. Arouse1973

    Total Resistance of circuit, when there is current source

    No the addition of the current source modifies the current and causes less current in the circuit. So although you have the same physical resistors which would give you the same resistance, the addition of the current source effectively increases the resistance of the whole circuit thus reducing...
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