Greetings.
I'm currently making a vlf receiver for listening to 'natural radio' (see attached)
I have all the parts, however, the 200mH inductor is causing me hassle.
I can't seem to find inductors anywhere this size, no problem, wind my own.
But the size of a wound air core inductor has me doing 3000 odd turns and would be pretty large.
edit: I have some ferrite rings lying around but they are unmarked so i can't finish the equation to find the turns for a torroidal.
The maker of the receiver uses a 1k to 8ohm audio transformer using the centre tap and one of the ends to make the inductor, however i can't find one of these either.
So, i was wondering if i could omit some parts and stick in an oscillator of some kind tuned to the freqs i would be looking for around 12-25khz, but i'm not that far into my electronics course and not sure how i would go about it, or even if it could be done. I think it could though.
Any radio heads able to advise me?
Cheers.
I'm currently making a vlf receiver for listening to 'natural radio' (see attached)
I have all the parts, however, the 200mH inductor is causing me hassle.
I can't seem to find inductors anywhere this size, no problem, wind my own.
But the size of a wound air core inductor has me doing 3000 odd turns and would be pretty large.
edit: I have some ferrite rings lying around but they are unmarked so i can't finish the equation to find the turns for a torroidal.
The maker of the receiver uses a 1k to 8ohm audio transformer using the centre tap and one of the ends to make the inductor, however i can't find one of these either.
So, i was wondering if i could omit some parts and stick in an oscillator of some kind tuned to the freqs i would be looking for around 12-25khz, but i'm not that far into my electronics course and not sure how i would go about it, or even if it could be done. I think it could though.
Any radio heads able to advise me?
Cheers.
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