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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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18th Jul 2010, 9:55 pm | #1 |
Retired Dormant Member
Join Date: Sep 2008
Location: Harrogate, North Yorkshire, UK.
Posts: 352
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winner of the smallest homebrew valve radio competition
I loved this so much I just had to post for others to see
http://www.jogis-roehrenbude.de/Wett...h/rraupach.htm |
18th Jul 2010, 10:06 pm | #2 |
Rest in Peace
Join Date: Jul 2004
Location: Dartford, Kent, UK.
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Re: winner of the smallest homebrew valve radio competition
The translated version :-
http://translate.google.com/translat...tm&sl=de&tl=en I like that, could it be made smaller? . Regards, Mick. |
18th Jul 2010, 10:22 pm | #3 |
Rest in Peace
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Re: winner of the smallest homebrew valve radio competition
Who actually built it - Ralf Raupach or the smug-looking troll?
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18th Jul 2010, 11:12 pm | #4 |
Dekatron
Join Date: Feb 2007
Location: Leominster, Herefordshire, UK.
Posts: 16,527
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Re: winner of the smallest homebrew valve radio competition
Well, there is a bit of free air inside the box. Given the size of the O/P TX that's there, a custom TX with some ordinary D- series valves would probably free up enough space to fit batteries in too, instead of hiding them in the cabinet it stands on. Using really small wire ended hearing aid types would save even more space, though output audio would be limited to maybe 50mW. Some ingenuity with capacitors could even see it mains powered!
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19th Jul 2010, 12:33 am | #5 |
Octode
Join Date: Apr 2009
Location: Aylesbury, Buckinghamshire, UK.
Posts: 1,522
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Re: winner of the smallest homebrew valve radio competition
I like the battery packed disguised as a scale sideboard.
Gets my vote for "toleration in the household". Rob.
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We have done so much, for so long, with so little, we are now qualified to do anything with nothing. |
23rd Aug 2010, 1:14 am | #6 |
Retired Dormant Member
Join Date: Dec 2004
Location: Burbage, Leicestershire, UK.
Posts: 28
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Maybe this fellow didn't get to enter .....
That is an interesting receiver. It certainly isn't the smallest, however ...click on the following link:-
http://www.hi-ho.ne.jp/ux-45/index.htm The site is a bit of a dog's dinner, at least on my comuter, as it doesn't handle Japanese characters ... but take a look at the size of the 4-'tube' superhet .... astounding stuff. David |
23rd Aug 2010, 1:00 pm | #7 |
Dekatron
Join Date: Feb 2007
Location: Lynton, N. Devon, UK.
Posts: 7,060
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Re: winner of the smallest homebrew valve radio competition
I'm really impressed! Especially the 8-valve AM/FM radio (though it does have a couple of nasty g*rm*n**m diodes).
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24th Aug 2010, 8:52 pm | #8 |
Retired Dormant Member
Join Date: Dec 2004
Location: Burbage, Leicestershire, UK.
Posts: 28
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Re: winner of the smallest homebrew valve radio competition
It does seem a shame to use solid state devices in that radio ... any radio, come to that ... a couple of GZ34s would have done nicely!
Thing about transistors, in my experience at least, is that they always blew and protected the fuses. And they wouldn't just wear out slowly like valves; they're a bit like pigs - they either go, or they don't. But the level of miniaturisation by that Japanese gentleman is, in my eyes, nothing short of miraculous. David |
24th Aug 2010, 11:36 pm | #9 |
Dekatron
Join Date: Feb 2007
Location: Leominster, Herefordshire, UK.
Posts: 16,527
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Re: winner of the smallest homebrew valve radio competition
Only one thing I can say about these....
I WANT ONE!
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....__________ ....|____||__|__\_____ .=.| _---\__|__|_---_|. .........O..Chris....O Last edited by Brian R Pateman; 25th Aug 2010 at 12:12 pm. Reason: Font corrected. |
25th Aug 2010, 11:29 am | #10 |
Octode
Join Date: Nov 2004
Location: Hebden Bridge, West Yorkshire, UK.
Posts: 1,885
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Re: winner of the smallest homebrew valve radio competition
I wouldn't fancy repairing that! The underside of the chassis looks like the forlorn Saba that is awaiting repair...trouble is every time I poke the soldering iron in it comes out with a few polystyrene caps smoking away on the bit....
Dom |