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brucedownunder2
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Joined: 14/09/2005
Location: Australia
Posts: 1548

Posted: 07:17am 23 Mar 2010

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had ago at winding a radio coil.

Bushboy

Gizmo

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Joined: 05/06/2004
Location: Australia
Posts: 5107

Posted: 07:42am 23 Mar 2010

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Nice job Bruce. Whats it for, a crystal set?

I built a crystal set a couple of years ago, just for fun. I'll take a photo but its packed away. I still remember my first crystal set I had when I was a child.

Glenn

The best time to plant a tree was twenty years ago, the second best time is right now.
JAQ

GWatPE

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Joined: 01/09/2006
Location: Australia
Posts: 2127

Posted: 09:35pm 23 Mar 2010

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Hi Bruce,

You may ge able to wind the wire more accurately by first cutting a thread slot into the former first. I am not sure if your lathe has thread cutting facilities.

Gordon.

become more energy aware

Gizmo

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Joined: 05/06/2004
Location: Australia
Posts: 5107

Posted: 10:13pm 23 Mar 2010

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I used to feed a length of string beside the wire, to give a even spacing. Then unwind the string once the wire was secured. A little varnish will hold it all in place.

Building a crystal set is one future project I have for thebackshed. Its kind of a renewable project

, using radio waves instead of solar or wind.

Glenn

The best time to plant a tree was twenty years ago, the second best time is right now.
JAQ

dwyer
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Joined: 19/09/2005
Location: Australia
Posts: 574

Posted: 10:43pm 23 Mar 2010

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Good on you Bruce
I did build crystal set when l was 12 years old using war aircraft headphone that around 1958 using wireless gang, cardboard tube,and brought back lovely memory at this time my hearing was good and now l am deaf with 80% loss and can't hear my own voice think getting Cochlear implant so yes Glenn let have new kind of project bulding a crystal set

Dwyer

Downwind

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Joined: 09/09/2009
Location: Australia
Posts: 2333

Posted: 02:32am 24 Mar 2010

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I to had built one back in high school, I remember winding the wire around a piece of PVC pipe, we put a twist in the wire every so many turns to give different tap points for the coil.

I lived in a country area then and there was only 1 station strong enough in signal to be picked up. ABC i think it was.

The Germanium diodes are getting hard to find nowdays and not many places stock them.
I was told recently that germanium diodes are no longer made anywhere, and its only the stock that is remaining thoughout the world.
I understand they have not been produced for over 10 years now.
I had required one for a different project recently and had to look hard to locate some.

Pete.

Sometimes it just works

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