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  1. Arouse1973

    Seeking Pro Help: Replacing Parts on This Card Reader With a Smaller One

    The battery you linked to is 20 mAh not 9 mAh. Adam
  2. Arouse1973

    Cuk converter ripple current

    Right here is my design. I had to change the frequency because I couldn't go that low with the device I chose. But goes to show how the formula works in a simulation. Fig 1. Circuit Diagram Fig 2. Inductor Current in L1 Fig 3. Formula and Calculations So from this you can see...
  3. Arouse1973

    Cuk converter ripple current

    Ok here is my attempt. I'll simulate it later and see if we are close. Adam
  4. Arouse1973

    Cuk converter ripple current

    It is strange that your course has asked you about such an unusual terminology. Most Cuk designs are for a negative inverter not a converter. For a positive version of thisyou would have to have a transformer of some kind. Adam
  5. Arouse1973

    Cuk converter ripple current

    Clue your looking for about 164uH. In your defence I will have a look and make sure I have not confused you. Adam
  6. Arouse1973

    Cuk converter ripple current

    Very good try. Look at the power calc. Adam
  7. Arouse1973

    Cuk converter ripple current

    Good try but nope.mH dont you think thats a bit big? Adam.
  8. Arouse1973

    Alarm when handbag opens accidentally

    The fact they supplied a circuit diagram indicates an interest in electronics, we should pursue this before say buy a new handbag. Thats all I am saying.
  9. Arouse1973

    How does the current flow?

    Umm I might upset people if I commented on this. So all I will say is Ben Franklin got it wrong, he had a 50/50 chance to get it right. We are now stuck with it as all the circuit diagram symbols lend them to conventional current. Most of the text books get it wrong so dont worry if your...
  10. Arouse1973

    Alarm when handbag opens accidentally

    Thats not what this Forum is about, it is about helping people with an interest in electronics. We can all say buy it from ebay. Who cares if a bigger bag with a better clip stops this, the OP might not want a new bag. Adam
  11. Arouse1973

    Hello Everyone!

    Hi Frenoy Good to have you here.I like your attitude from the few posts you have replied to. You seem like you could offer ideas and are willing to learn. Welcome Adam
  12. Arouse1973

    Dumb question re. simple inverter

    Hey Duke where you been, nice to see you back Adam
  13. Arouse1973

    Primer on Transformers needed

    Hi Dave That's fair enough, I wasn't talking about any particular type of transformer or inductor. I was merely adding something about core materials and trying to keep it basic. Regardless of transformer construction, permeability is the ratio of B(flux density) to H (magnetizing force) and as...
  14. Arouse1973

    Primer on Transformers needed

    Core material effects many factors but mostly the permeability and hysteresis of the core. This effectively is how easy the core will transport magnetic flux. A cores resistance to magnetic flux is called reluctance so a core with a high permeability will have a low reluctance. But due the...
  15. Arouse1973

    Robot servos shaking when registering to a network via radio

    What power supply are you using and where do you take the power for the servos from, what servos are you using? Can you show us a schematic? What timings are you using for the servo PWM. Adam
  16. Arouse1973

    hello guys

    Hello The Lion and welcome :) Adam
  17. Arouse1973

    Cuk converter ripple current

    Ok
  18. Arouse1973

    Cuk converter ripple current

    Ok here is what I have so far. See if you can follow it? You will have to do a bit of work yourself. :) I am going to be a bit mean here and get you started and see if you can fill in the blanks. Ok first thing I would do is work out the duty cycle (DC) needed. This is DC Vout / (Vin+???)...
  19. Arouse1973

    200w Bluetooth speaker build

    Very nice Adam
  20. Arouse1973

    Cuk converter ripple current

    Ok as it's a distance learning course I'll give you a little more help. I'll see if I can put something together tonight. But because it's quite unclear and you don't have a circuit I will have to generate one so the answers may not be exactly what you want but close enough. Adam
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