[XCSSA] Blowing Fuses and Unsure Why

[X-otic Computer Systems of San Antonio]

No I didn't get a chance to work on it yesterday (the e-mail that was  
sent late last night was the same one I sent that you read). Plan on  
doing that this weekend, though. Can you elaborate on the wire-wrap? I  
can use that as a fuse?


On Jan 9, 2009, at 5:53 AM, X-otic Computer Systems of San Antonio  
wrote:

>> the 9VDC lights up for a few seconds and then my
> fuse blows.
>> Everything looks connected properly but there is no
> load on
>> either side except for the  LEDs. I'm thinking it
> has something
>> to do with grounding. I haven't connected the
> grounds on either
>> side and I'm guessing that might be my problem? If
> so, does it
>> matter where I connect the grounds together?
>
>  No, it does not matter !
>
>  Did you split it, like I suggested yesterday?  If
> you did, was
>  it the input side (to the 9V regulator)or the
> output side?
>  Sounds it's the output side. and more importantly,
> you're blow-
>  ing a .5A fuse, that's a lot of current.  Your LED
> as shown only
>  draws .023A (23mA) and the amount of turn on filter
> surge is
>  nominal.
>
>  Something, besides the LED & R2 is drawing in
> excess of 477mA!
>
>> Unfortunately, I ran out of pico fuses.
>
>  For trouble shooting, if you have any 30gauge wire
> wrap wire you
>  could use that for trouble shooting the problem.
>
>  Try disconnecting the LED (LED2) and see if it
> still blows the
>  fuse or 30gauge wire.
>
>  Too bad I'm a Hill Country hermit, I could find/fix
> it in a few
>  minutes.
>
> Lou
>
>
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