1st cap heats up...

JojoD818 · 20th September 2006, 01:57 AM

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?

Tony · 20th September 2006, 02:29 AM

what is the voltage accross that cap?

JojoD818 · 20th September 2006, 02:35 AM

i forgot to mention...

around ~330V max during warm-up and ~310V after 60 secs.

djQUAN · 20th September 2006, 03:19 AM

slightly OT: hey jojo, do you know where to get tubes in our area?

ray_moth · 20th September 2006, 07:31 AM

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.

JojoD818 · 20th September 2006, 01:33 PM

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.

Tony · 21st September 2006, 02:07 AM

Pacific Electronics near DEECO is a good source for GE tv tubes and japanese 12au7, 6cg7's cost is 250 per tube.

jarthel · 21st September 2006, 02:10 AM

Quote:

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.

Tony · 21st September 2006, 02:22 AM

i am in russia at the moment, sorry...

JojoD818 · 21st September 2006, 07:41 AM

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.

20th September 2006, 01:57 AM	#1
JojoD818 diyAudio Moderator Join Date: Mar 2003 Location: diyAudio Special Operations Center	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?

20th September 2006, 02:29 AM	#2
Tony diyAudio Member Join Date: May 2003 Location: Palatiw, Pasig City	what is the voltage accross that cap? __________________ http://www.electronicslab.ph/forum/i...?topic=32688.0

21st September 2006, 02:07 AM	#7
Tony diyAudio Member Join Date: May 2003 Location: Palatiw, Pasig City	Pacific Electronics near DEECO is a good source for GE tv tubes and japanese 12au7, 6cg7's cost is 250 per tube. __________________ http://www.electronicslab.ph/forum/i...?topic=32688.0

21st September 2006, 02:22 AM	#9
Tony diyAudio Member Join Date: May 2003 Location: Palatiw, Pasig City	i am in russia at the moment, sorry... __________________ http://www.electronicslab.ph/forum/i...?topic=32688.0

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20th September 2006, 02:35 AM	#3
JojoD818 diyAudio Moderator Join Date: Mar 2003 Location: diyAudio Special Operations Center	i forgot to mention... around ~330V max during warm-up and ~310V after 60 secs.

20th September 2006, 03:19 AM	#4
djQUAN diyAudio Member Join Date: May 2004 Location: manila	slightly OT: hey jojo, do you know where to get tubes in our area?

20th September 2006, 07:31 AM	#5
ray_moth diyAudio Moderator Emeritus Join Date: Jan 2004 Location: Jakarta	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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