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From: Boris Mohar
Subject: Re: Inductor used in 110v to 15v
X-Newsreader: Forte Agent 1.92/32.572
Date: Thu, 28 Nov 2002 20:26:45 -0500
NNTP-Posting-Date: Thu, 28 Nov 2002 20:26:56 EST
Organization: Bell Sympatico
On Fri, 29 Nov 2002 01:20:03 GMT, John Popelish
>> I have a 950VA 110 to 13vac transformer. Would it be too tall of an order to get some advice on converting the output to DC? I
>> know that I will need some high current diodes but I do not know how many nor which type. Also, how would I wire in the diode(s)?
>> A diode allows a certain amount electricity to flow in one direction. I just do not understand how this behavior can convert to
>> direct current. It can not be too complicated, right?
>> Many Thanks,
>Did you just buy one of these big transformers form ebay? I have one
>on the way, and am anxious to see what it looks like.
>You will need a bridge rectifier that can handle at least 73 amps
>(950VoltAmps/13Volts=73amps) and at least
>13volts*(square root of 2)=19volts
>This tutorial covers the concept of a bridge rectifier.
>Bridges in this current rating are usually made of 4 separate stud
>mounted or otherwise heat sinkable diodes. Since each diode carries
>current only half of the time, you might get by with diodes rated for
>only half of the 73 amp rating of the transformer.
>An example of a 75 amp 35 volt schottky diode (less heat production
>than a junction diode) would be the 75HQ035 in a DO-5 stud mounted
>case at about $10 each from Digikey.
>You can mount two of them on one heat sink, since two of the studs
>will get connected to build the bridge, but you will have to either
>isolate the other two diodes from that heat sink, or mount them on
>separate pieces of metal that are held in insulated mounts.
Some fuses would be in order also.
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