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  1. Cloink

    Voltage Multiplier

    Hi audioguru Thanks for all your time - you've still missed some of my points though. I already have 8AA's in use for the circuit. My hope was to reduce the AAs to AAAs (to save weight and also 'cos the AAAs would fit in the casement in which the LED array is housed whereas 8 AAs don't). Of...
  2. Cloink

    Voltage Multiplier

    First things first. audioguru was right to have reservations about how much power the fan/dynamo can produce. When blowing on it, taking the output directly into a bridge rectifier and not into the multiplier, I can keep a single high luminosity LED lit. On the other hand, a fully charged...
  3. Cloink

    Voltage Multiplier

    A site with a full-wave voltage multiplier of arbitrary factor if anyone else was looking for one.... http://members.tm.net/lapointe/Cockcroft_Walton.htm
  4. Cloink

    Voltage Multiplier

    Yes, thank you, that was very much more helpful and I will consider finding diodes with a lower voltage drop, or just looking for a different method - or maybe giving up altogether, after all, I've already got rechargeable batts. But for interest, before I savaged the motor, it was a 'fancy'...
  5. Cloink

    Voltage Multiplier

    Please please read the postings properly. I'm sorry, I know I'm really a guest on this site, and I do appreciate all your help, but I'm quite exasperated that you haven't read my points. I want to trickle charge the batts from the dynamo, I DO NOT expect to get 4W of power from the dynamo...
  6. Cloink

    Voltage Multiplier

    Thank you, very much appreciated! It's a brushless motor (from a pc-fan) - I will triple-check when I get a chance but my multimeter gave very spurious results when I connected it in DC-mode, but very consistent results when connected in AC-mode (of course, this was when I was blowing on the...
  7. Cloink

    Voltage Multiplier

    Thanks for all your responses but PLEASE could you answer the questions Q1 - Q3 directly? (I've got Q4 now.) Of course I can't increase the power output by multiplying the voltage, but if the multiplier is only a half-wave multiplier then I can only presume it will have a poor efficiency. Yes...
  8. Cloink

    Voltage Multiplier

    Ooo-kaaay.... Sorry, that's not really helped. Q1 Can I use the electrolytic caps I've already got, or do I need to go get ceramic ones? The other site I mention is http://www.tpub.com/neets/book7/27m.htm Towards the bottom of that page it's got "Figure 4-49. - Full-wave voltage doubler"...
  9. Cloink

    Voltage Multiplier

    Just looking for a bit of help, I'm not an electronics whizz, remember some from school & uni, so assume I'm an idiot please! I'm trying to make the voltage multiplier circuit, but nowhere does it say whether ceramic caps must be used or whether electrolytic ones are ok. (Just to be...
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