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Old 25th March 2012, 04:44 PM   #7471
evanc is offline evanc  United States
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I should be able to finish this up this afternoon...I will report back
Thanks for the good advice, Evan
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Old 25th March 2012, 04:49 PM   #7472
evanc is offline evanc  United States
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Since I am going to open this up to shorten the wires here is a question. What would be the smallest gauge wire that should be used. Thinner wire is easier to work with.
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Old 25th March 2012, 05:04 PM   #7473
AndrewT is offline AndrewT  Scotland
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post7455,
are those fuses in the bottom left corner at risk of being shorted to chassis?
Are they Mains fuses?
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Old 25th March 2012, 05:08 PM   #7474
evanc is offline evanc  United States
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yes, they are mains fuses, but I don't see any way for their connectors to short to the chassis. The lack of depth perception in the photo makes them look closer the chassis then they are.
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Old 25th March 2012, 05:21 PM   #7475
AndrewT is offline AndrewT  Scotland
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Why two mains fuses?
Are you fusing the Neutral?

What if a short length of strand from a stranded cable fell in through a ventilation hole?

What if the screwdriver you are holding touched the exposed live connections?
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Old 25th March 2012, 05:25 PM   #7476
vgeorge is offline vgeorge  Greece
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Regarding wire gauge, I think that you can even go down to CAT5.
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Old 25th March 2012, 05:46 PM   #7477
evanc is offline evanc  United States
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Great I have plenty of cat 5 wire. I am thinking 2 strands per connection.

I fuse both in case there is a mix up in the houses wiring. Making up the connection to one fuse or two is about the same amount of work and I saw no reason not to.

I will Put heat shrink over the exposed connections of the fuses and or a small plastic cover over the whole area.

Thanks, Evan
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Old 25th March 2012, 05:51 PM   #7478
AndrewT is offline AndrewT  Scotland
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Quote:
Originally Posted by evanc View Post
I saw no reason not to.
if the Neutral line fuse blows, there is a high risk that the chassis can be LIVE, even though the equipment "sounds" dead.
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Old 25th March 2012, 05:54 PM   #7479
Salas is offline Salas  Greece
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Quote:
Originally Posted by Marinos View Post
Hi all,

Feeding the Low MC from a 12VAC source as per pdf does the 7809 need heatsink ?
Rephrasing my question, from your experience how much dissipation the 7809 can do without any heatsink ?
It won't need one, in this case it will dissipate 90mW and it can be relatively safe for ~1W on its own.
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Old 25th March 2012, 05:54 PM   #7480
evanc is offline evanc  United States
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There's my reason. I will eliminate the fuse on the neutral.
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