[Waverley ARS] Wyong Field Day - Scroungers Corner (vola)

[henry mark swiss]

Hi Eddie, You can get what's called a 'microtemp' thermal fuse. They're available from Wes Components in Ashfield. There would be various temp values, would have to check their catalogue or website.
Rgds
Henry.
----------------------------------------
> From: eric at van-de-weyer.org
> To: eddiehan at bigpond.net.au; members at vk2bv.org
> Date: Mon, 18 Feb 2008 22:25:26 +1100
> Subject: Re: [Waverley ARS] Wyong Field Day - Scroungers Corner  (vola)
> 
> Hi Eddie,
> 
> Farnell have some similar thermal switches available. Their current rating
> is only 1A but that is going to sufficient, most likely. They also have some
> 3A ones but that range doesn't have 115 degrees.
> 
> 73....Eric VK2VE.
> 
> -----Original Message-----
> From: members-bounces at us.cactii.net [mailto:members-bounces at us.cactii.net]
> On Behalf Of Eddie Hanham
> Sent: Monday, 18 February 2008 11:06
> To: members at vk2bv.org
> Subject: [Waverley ARS] Wyong Field Day - Scroungers Corner (vola)
> 
>    For those that were at Wyong on the weekend and picked up a 13.8 power
>    supply that was cactus, here is some hope.
> 
>    I got two for $10 expecting if I couldn't repair them I could  use the
>    case as a housing for other projects.
> 
>    I checked the two P/S 240ac circuit at the plug and found them open
>    circuit.
> 
>    Checked the fuse and mains swith and they were ok so removed the
>    transformer.
> 
>    Knowing it was cactus I decided to check the red mains winding on the
>    transformer by removing the plastic tape. I did this because most
>    breakages occur near the connection to the plastic insulated wire.
>    Imbedded under the insul;ation tape was a thermal switch which, when
>    checked, was O/C. It was an AUCA 115 deg C 5 amp 10mm square plastic
>    device.
> 
>    I have looked on the internet and in retail store catalogues but can't
>    find an AUCA supplier in country.
> 
>    Found the following site though:
> 
>    http://www.uchobby.com/index.php/2007/03/20/wall-wart-scrounging/
> 
>    Which describes same details of finding the device.
> 
>    Anyone help in finding replacement AUCA square device. Jaycar have a
>    tublular ones which evidently don't give the same heat transfer.
> 
>    Haven't checked the rest of the Power supplies but suspect the 2N3055
>    pass transistors failed and overheated the TX. the 2n3055 transistors
>    don't have .1ohm restors and evidently if one goes the lot go!!
> 
>    BUT THERE's MORE
> 
>    Seeing I found the above site there are more articles on the same site
>    that may be of interest to others, check out other side bar articles
>    under SCROUNGING.
> 
>    This one helps identify components:
> 
>    http://www.uchobby.com/index.php/2007/07/15/identifying-electronic-comp
>    onents/
> 
>    Any comments
> 
>    Eddie
> 
>    VK2BEH
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