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Homebrew Equipment A place to show, design and discuss the weird and wonderful electronic creations from the hands of individual members. |
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9th Sep 2015, 7:58 pm | #1 |
Pentode
Join Date: Jul 2014
Location: Bangalore, India
Posts: 132
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A Makeshift Crystal Radio Output Transformer
This project was part of my initial attempts at homebrewing an output transformer for my 'Loudspeaking Crystal Radio' http://nandustips.blogspot.in/2014/0...h-speaker.html.
An air-core crossover network inductor and a ferrite-core one (from the junkbox) appeared suitable as the primary and secondary windings of the transformer. The large number of turns of the air-core inductor as primary and the small number of the ferrite one as secondary would give a step-down ratio. With luck, the open ferrite core would enable reasonable coupling. Testing was simple, with the air-core inductor hooked up to the crystal radio and the ferrite-core one (placed within) connected to the speaker. The result was encouraging enough for further attempts which culminated in a proper 'Crystal Radio Output Transformer' http://nandustips.blogspot.in/2015/0...ansformer.html. Regards, Nandu. |
10th Sep 2015, 9:06 am | #2 |
Dekatron
Join Date: May 2003
Location: Edinburgh, UK.
Posts: 3,274
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Re: A Makeshift Crystal Radio Output Transformer
Hi Nandu,
How would you rate the volume from your 200kW transmitter? Could you listen to a radio talk show or play at the other side of the room? Peter |
10th Sep 2015, 11:52 am | #3 |
Pentode
Join Date: Jul 2014
Location: Bangalore, India
Posts: 132
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Re: A Makeshift Crystal Radio Output Transformer
Hi Peter,
Certainly not across the room but comfortably a couple of feet away. Regards, Nandu. Last edited by vu2nan-nandu; 10th Sep 2015 at 12:04 pm. |