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Old 20th September 2006, 01:57 AM   #1
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Default 1st cap heats up...

the 1st cap of my test psu heats up. it's a 4.7uf/450V electrolytic and is used in a setup like this:

280-0-280->5y3gt->4.7uf->1.8K->220uf->2.2K->220uf->load.

the load is constant at 20mA. is it too much ripple?
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Old 20th September 2006, 02:29 AM   #2
AJT is offline AJT  Philippines
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what is the voltage accross that cap?
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Old 20th September 2006, 02:35 AM   #3
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i forgot to mention...

around ~330V max during warm-up and ~310V after 60 secs.
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Old 20th September 2006, 03:19 AM   #4
djQUAN is offline djQUAN  Philippines
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slightly OT: hey jojo, do you know where to get tubes in our area?
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Old 20th September 2006, 07:31 AM   #5
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As long as you're sure the cap isn't getting warm from being too close to some other part that gives off heat, then it could be due to ripple. The first cap must be rated for high ripple current.
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Old 20th September 2006, 01:33 PM   #6
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Quote:
Originally posted by djQUAN
slightly OT: hey jojo, do you know where to get tubes in our area?

hi,

there is Spin Electronics in Mandaluyong, I think Deeco also stocks some tubes.

Quote:
As long as you're sure the cap isn't getting warm from being too close to some other part that gives off heat, then it could be due to ripple. The first cap must be rated for high ripple current.
It is actually near a the 5W 1.8K resistor which feeds the second cap. I will try to put some space between them. I am just worried since out of the three caps, the first cap is the only one that heats up.
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Old 21st September 2006, 02:07 AM   #7
AJT is offline AJT  Philippines
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Pacific Electronics near DEECO is a good source for GE tv tubes and japanese 12au7, 6cg7's cost is 250 per tube.
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Old 21st September 2006, 02:10 AM   #8
jarthel is offline jarthel  Australia
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Originally posted by Tony
Pacific Electronics near DEECO is a good source for GE tv tubes and japanese 12au7, 6cg7's cost is 250 per tube.

Where in Manila is deeco and pacific eletronics?

what tubes does spin electronics sell?

any contact number for these places?

thank you.
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Old 21st September 2006, 02:22 AM   #9
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i am in russia at the moment, sorry...
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Old 21st September 2006, 07:41 AM   #10
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Quote:
Originally posted by ray_moth
As long as you're sure the cap isn't getting warm from being too close to some other part that gives off heat, then it could be due to ripple. The first cap must be rated for high ripple current.
I moved the cap away from the resistor and run the test jig for 10 minutes and the cap really is the one heating up by itself and not through passive transfer.

I guess one solution is to remove that cap completely.

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