The Master Of Magnetics "Steven Mark"

[fcpeace17]

my post was lost in the horrible quote i did but bassically my question is, if you have 2 coils A and B and they are resonating to create spikes, then the resulting spike resonant frequency is a harmonic of a third coil (which may be tuned to an earth frequency) which will cause a 2nd climb in amplitude. Then say that final amplitude jump is a frequency that resonates one of the original A or B's or both, it seems like  this will credate a viscious cycle. sorry for the not so good description. Evan

hi ,
i had to read it 3 times but i think you mean,

2 coils are resonating at a frequency and the signal comming out of that is resonating with an earth frequency so the final product is the peak from 1 and 2 plus the peak from the earth so we have more than we put into.

or isnt that what you mean?
sometimes i also hava hard time expressing what i mean
marco.

Yes, this is what i meant, it wouldnt have to be an earth frequency neccisarily, it could be a third coil which is set to a certain frequency. Then i wonder if that 1+2+3 frequency (3 being the "earth frequency"), could be fed back into the system to somehow resonate with 1 and 2 again. then that would resonate 3 and so on, going back to the begining again except growing eachtime. is it possible to feed the 3 back in so that it resonates with the initial 1 and 2 frequecies again. Evan  

[starcruiser]

@Dave,

I started the build on the small torrid for the signal generator and ran into a snag, it seems I did not have a Germainium diode and the local radio shack doesn't carry them any longer. So it appears that I will need to wait until Monday to go out and locate some. Not many parts stores open on Sunday

I did snap a few pix showing the build though, I used a piece of 5/8 inch plywood cut using a hole saw (2'' dia) with a 7/8'' center hole. I wrapped it using 26 gauge magnet wire (about 11 feet of it).

I will be posting more results as I move this along.

[Mr_Video]

Hey Carl,

Nice work!  Looking forward to your results.

If you cannot get OA90/91, you can try 1n4001?

What is the resonant frequency to be?  If its 7.8Hz it will be many henrys or a very large cap?  Or are you going for a higher frequency and supply a seperate signal with a generator for now?



Dave.

I don't know why he needs a germanium diode,
but a 1N4001 isn't the same, a 1N4001 is a silicon hi current diode and it has a higher voltage drop across it than a germanium diode does .

[starcruiser]

@ave,

Thanks for the cudos on the work. I require a germainium since it has a very low voltage drop when detecting signals, I believe it is an IN34. I tried a standard signal diode and got something but nowhere nearly enough. The main coil was resonating around 900 hz but was jumping around a bit so I am thinking a large cap inconjunction with the small coil to get the resonant frequency lower. I am trying for 924hz for a starter then to see if I can get it down even futher to between 7 and 12 Hz.

BTW, here is a pix of the coil I am working with now.

[starcruiser]

I require a germainium since it has a very low voltage drop when detecting signals, I believe it is an IN34. I tried a standard signal diode and got something but nowhere nearly enough.

You should try a Schottky diode like the BAT series. (BAT52, BAT65, etc...)
They have 0.2V drop.

Kosh

Kosh,

I was reading that the Schottky diodes require a bit of bias before they work properly (I may be off base on this) and I am trying to create a signal source that requires no external power this is why I am looking at a crystal radio type of design, thus the germanium since it does not require any external bias.

Do you think the Schottky would do in this situation?