Mysterious Resonant Circuit

[Peterae]

Yes the core was bought in the UK in Maplin
N87AB   HEM3010   31.8   22.75   18.5   88    146

see web page
http://www.maplin.co.uk/module.aspx?ModuleNo=32792&doy=29m7

Peter

[aleks]

your output power across the 149.3 Ohm load is (16.72 x 16.72) / 149.3 = 1.8724W  (I took 16.72 by dividing your peak to peak voltage of 47V by 2.82 to get its true RMS value, your scope give a bit better value for this as 17.55V)

Note the RMS figure is worse - 15.55V, but this still gives COP>1. I wonder about connected battery plot whose PK-PK is 1.72V. If it's true, the COP is probably close to 10 here.

[Peterae]

Hi EM
Great find, all respect to you, i am mearly copying your work

Thanks
Peter

[gyulasun]

Note the RMS figure is worse - 15.55V, but this still gives COP>1. I wonder about connected battery plot whose PK-PK is 1.72V. If it's true, the COP is probably close to 10 here.

Hi Aleks,

I understand that in case Peter's present AC voltage drop of 1.72 Vpp is shunted and then it can add to the useful output this it is still far from a COP of 8-10.  How do you mean this I wonder?

Thanks, Gyula

Peter,  thanks for the toriod core data!

[Hoppy]

Peter,

Your measurements give also a COP of about 1.25 so CONGRATULATIONS to you too!!!

your input power is 12.6V x 0.118A = 1.4868W

your output power across the 149.3 Ohm load is (16.72 x 16.72) / 149.3 = 1.8724W  (I took 16.72 by dividing your peak to peak voltage of 47V by 2.82 to get its true RMS value, your scope give a bit better value for this as 17.55V)

your COP is 1.8724 / 1.4868 = 1.25

Of course you need further "cleaning" across the battery like EMdevices just showed on his modified schematics.

Also, try to connect the battery lead to members of your battery bank lower in voltage to be able to reduce supply voltage to find 'sweeter working point' .

rgds,  Gyula

Just a reminder that the RMS shortcut Vpk x 0.707 can only be applied to a pure sinewave.

Hoppy