Comments on: About http://www.5volt.eu A mean to organize, document and share some of the things I do Sun, 27 Jun 2010 17:51:32 +0200 http://wordpress.org/?v=2.9.1 hourly 1 By: admin http://www.5volt.eu/about/comment-page-1#comment-484 admin Fri, 25 Jun 2010 15:36:15 +0000 #comment-484 @MIloni, Given your figures you should get 60uV per uT against mine 500uV per uT. You should read something, actually, if a reasonable (variable !) magnetic field is applied. Try checking around an heavy transformer (not a mobile phone charger). If you get a complete zero you should check your build, your components and your multimeter. Best Regards A. @MIloni, Given your figures you should get 60uV per uT against mine 500uV per uT. You should read something, actually, if a reasonable (variable !) magnetic field is applied. Try checking around an heavy transformer (not a mobile phone charger). If you get a complete zero you should check your build, your components and your multimeter.
Best Regards
A.

]]> By: MIloni http://www.5volt.eu/about/comment-page-1#comment-482 MIloni Fri, 25 Jun 2010 08:31:17 +0000 #comment-482 yes the dual supply is Ok. I measured it with a voltmeter. The battery has discharged so it is less than 9 volts(around 8 volts) the dimension of the core are 4.5cm*5.5 cm. Thoughthe turns are only 80 and they dont cover this entire area.The number of turns are v less but atleast some voltage should be induced. yes the dual supply is Ok. I measured it with a voltmeter. The battery has discharged so it is less than 9 volts(around 8 volts)
the dimension of the core are 4.5cm*5.5 cm. Thoughthe turns are only 80 and they dont cover this entire area.The number of turns are v less but atleast some voltage should be induced.

]]> By: admin http://www.5volt.eu/about/comment-page-1#comment-478 admin Wed, 23 Jun 2010 11:52:02 +0000 #comment-478 Is the dual supply OK ? did you measure it with a voltmeter ? What is the size of your foam core ? Is the dual supply OK ? did you measure it with a voltmeter ?
What is the size of your foam core ?

]]> By: MIloni http://www.5volt.eu/about/comment-page-1#comment-476 MIloni Wed, 23 Jun 2010 07:20:41 +0000 #comment-476 Dear Alessandro, I am exactly following your circuit but am unable to get the output. I have used TC7660 with the circuit you have recommended to reduce the ripple. But i think the number of turns are not enough. I am putting the windings on a foam squarish piece and have put around 80 turns. With your calculations, I should have more turns but atleast I should be able to get some voltage. please help thanks in advance Dear Alessandro,
I am exactly following your circuit but am unable to get the output. I have used TC7660 with the circuit you have recommended to reduce the ripple. But i think the number of turns are not enough. I am putting the windings on a foam squarish piece and have put around 80 turns. With your calculations, I should have more turns but atleast I should be able to get some voltage. please help
thanks in advance

]]> By: admin http://www.5volt.eu/about/comment-page-1#comment-467 admin Sun, 13 Jun 2010 07:36:38 +0000 #comment-467 @MIloni, once you're done with the project send some pictures ! Now, if simpler ICL7660 means fewer capacitors across the power supply (in and out), just leave them in place because they are necessary regardless the datasheets because to voltage inverter IC is not very stable and has some bad ripple at its output. You can choose whatever output level you want given a mag field input, just place the values in the equations and find the number of turns you need. 500 uV is a good tradeoff : reasonable number of loops and reasonable amplifier gain for a reasonable household field. Ciao Alessandro @MIloni, once you’re done with the project send some pictures !
Now, if simpler ICL7660 means fewer capacitors across the power supply (in and out), just leave them in place because they
are necessary regardless the datasheets because to voltage inverter IC is not very stable and has some bad ripple at its output.
You can choose whatever output level you want given a mag field input, just place the values in the equations and find the number of turns you need. 500 uV is a good tradeoff : reasonable number of loops and reasonable amplifier gain for a reasonable household field.
Ciao
Alessandro

]]> By: MIloni http://www.5volt.eu/about/comment-page-1#comment-465 MIloni Sat, 12 Jun 2010 06:10:23 +0000 #comment-465 Thanks for previous help on lfmf magnetic flux meter. The ICL7660 has a simpler circuit that i found for conversion. Do I need to connect the ICL part that way. Also why are we saying 500uV across the end of the coil. Any particular reason? Can I also use that fact and also that Bcos(wt)= 1uV. What is the reason for that and should I use it too? if the battery itself has millivolt ripple will it not superimpose on the magnetic field? please help me thanks in advance awaiting ur reply Thanks for previous help on lfmf magnetic flux meter. The ICL7660 has a simpler circuit that i found for conversion. Do I need to connect the ICL part that way. Also why are we saying 500uV across the end of the coil. Any particular reason? Can I also use that fact and also that Bcos(wt)= 1uV. What is the reason for that and should I use it too? if the battery itself has millivolt ripple will it not superimpose on the magnetic field?
please help me
thanks in advance
awaiting ur reply

]]> By: admin http://www.5volt.eu/about/comment-page-1#comment-459 admin Wed, 09 Jun 2010 09:09:55 +0000 #comment-459 You mean the magic wand clock, the one on Instructables.com ! Yes, it can be modified as such. Probably one more switch would be required to set the alarm or some trick could be used to enter the "set alarm" mode (say like keeping the trigger button pushed and then push set hours button). Ciao Alessandro You mean the magic wand clock, the one on Instructables.com ! Yes, it can be modified as such. Probably one more switch would be required to set the alarm or some trick could be used to enter the “set alarm” mode (say like keeping the trigger button pushed and then push set hours button).
Ciao
Alessandro

]]> By: admin http://www.5volt.eu/about/comment-page-1#comment-458 admin Wed, 09 Jun 2010 09:02:53 +0000 #comment-458 You don't really need the JVC loop antenna. Any other non-conductive rig can be used. I'd not advise for a pen, unless you want to gauge strong, well localized fields. I say strong because the equation shows that the smaller the area of the loops, the more loops are required for same output. This might not be a problem if <em>veeeeeery</em> thin wire is used, otherwise the coil would became bulky and the equation would not hold reliably any longer. I think that some cardboard the size of the JVC loop antenna is a good tradeoff between number of loops (and thus reliablity of the simple equation) and area that can be gauged . Best Alessandro You don’t really need the JVC loop antenna. Any other non-conductive rig can be used. I’d not advise for a pen, unless you want to gauge strong, well localized fields. I say strong because the equation shows that the smaller the area of the loops, the more loops are required for same output. This might not be a problem if veeeeeery thin wire is used, otherwise the coil would became bulky and the equation would not hold reliably any longer.
I think that some cardboard the size of the JVC loop antenna is a good tradeoff between number of loops (and thus reliablity of the simple equation) and area that can be gauged .
Best
Alessandro

]]> By: MIloni http://www.5volt.eu/about/comment-page-1#comment-457 MIloni Wed, 09 Jun 2010 06:28:13 +0000 #comment-457 Hi can you please help with regard to your low frequency magnetic flux meter. i dont have a JVc loop antenna. so can i coil a copper wire around a pencil? please reply asap thank u Hi
can you please help with regard to your low frequency magnetic flux meter. i dont have a JVc loop antenna. so can i coil a copper wire around a pencil?
please reply asap
thank u

]]> By: jerry villarreal http://www.5volt.eu/about/comment-page-1#comment-456 jerry villarreal Tue, 08 Jun 2010 16:01:10 +0000 #comment-456 Can your magic pov wand clock be modified to be a clock timer? I appreciate your. Great projects! Regards Jerry Can your magic pov wand clock be modified to be a clock timer? I appreciate your. Great projects!

Regards
Jerry

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