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Elektor Editor
468 posts
Power User
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20-08-2007 15:22
It's come to our attention that the top part of the ferrite bobbin on the PR4401 board* may be damaged owing to rough handling. We are investigating the exact causes of the damage, which are beyond our control and apologise for any inconvencience caused.
Provided the inductor wire still has its continuity, the circuit should function normally despite damage to the ferrite bobbin. Actual measurements on lightly damaged samples showed a current increase of about 10% w.r.t. intact samples. This is no problem as it only results in slightly higher intensity of the LED.
EE Editor
EE Labs
* free item supplied with every copy of Elektor Electronics issue September 2007
Post edited by
on 31-08-2007 22:00
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kypros
8 posts
Popping In
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13-09-2007 08:56
Hi,
It happened to me also, find a damaged coil.
After testin the circuit and carried out some measurements, I found no problem at all to operate it as it was.
I also carried out some more experiments with home made coils in the range of 10 to 20 uH and all performed ok but some were better.
That depends on the core matterial and the inductance.
Now the coil on my board is replaced with one I wound and has an inductance of 19 uH. Its efficiency is little bit higher than with the original (broken one).
It is an amazing project to experiment with, THANKS ELEKTOR.
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laotour
1 post
Popping In
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15-09-2007 17:42
I am resident in South Africa and also received a damaged inductor board via snail-mail.However the board functions OK although I did not check current.
Just to let you know.
Really a very nice project and idea that one can build upon!
Thank you very much
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transputer
1 post
Popping In
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18-09-2007 14:50
The same to me.
My coil on the board was broken too.
A had a look at other boards in a shop
and found not one board with a undemaged
coil. - Not exactly true, on some Elektor`s
the print was missing...
Regards Frank
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kellys_eye
4 posts
Popping In
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20-09-2007 17:19
Not only were the tops of ALL the ferrite broken in the W H Smiths stash of magazines.... NONE of the mags had the boards attached - they'd all fallenoff to the bottom of the stand
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Yiannis
1 post
Popping In
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26-09-2007 15:22
The same to me.
The ferrite and coil on my board was broken too.
Regards,
Yiannis.
Post edited by Yiannis
on 26-09-2007 15:23
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Paul_Gamble
14 posts
Popping In
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01-04-2008 19:09
Hi guys
the problem was that they were only taped bare to the magazine - no bag etc. It was inevitable that most would fall off and break.
I was lucky. I found a show with 8 copies. All the boards were in the bottom of the magazine tray ... and one was perfect 
Paul.
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