Another 555 question

embrown057 · 11th May 2010, 06:13 PM

This is my first post on you site , I do apologize for asking the same questions others have made but I seem to be having a hard time gathering what I need. I only have two simple questions:
On the older 555 what is the value of the bypass caps to be across the larger 15k caps.
Second: Where do most purchase the replacement 15k@100vdc caps at?
I have checked around any anything close at Mouser has a 14wk lead time. I was thinking of replacing them with a low ERS, high ripple cap @105c. Nichicon has such a cap p/n=LNT2A153MSE that looks good but same long lead time. There is also some 18k@100vdc on EBAY but I have no idea if these are counterfeit and I do not want to change the value of the cap. Please any suggestions would be great. I used to work in the audio field in the 70’s at Solid Sound in Bolder and M.E.R in Denver, so I do have a good background in repair.

Mooly · 12th May 2010, 06:40 AM

Seeing 555 I automatically think timer... maybe others looking at the thread title think the same... maybe you do mean 555 timer

hmmm with 15k ? 15000uf ?? maybe not.

Nrik · 12th May 2010, 07:42 AM

Or a Sanyo integrated amp.

godfrey · 12th May 2010, 08:33 AM

Quote:

Originally Posted by Mooly

Seeing 555 I automatically think timer... maybe others looking at the thread title think the same...

Yup! Like a moth to a candle when I saw "555"

Quote:

Originally Posted by embrown057

...Where do most purchase the replacement 15k@100vdc caps at?
[snip]... a low ERS, high ripple cap @105c.

Digi-Key has some that might be suitable e.g. Digi-Key - P13203-ND (Manufacturer - ECE-P2AA153HA)

data · 12th May 2010, 08:35 AM

Or is it the Sansui AU-555?

15000uf@100vdc caps...hmm...maybe not

infinia · 12th May 2010, 08:38 AM

I love 555's but 888's are infinitely better

AndrewT · 12th May 2010, 09:53 AM

14hrs since posting and Embrown is silent.
Does he want our help?

djk · 10:57 AM

"On the older 555 what is the value of the bypass caps to be across the larger 15k caps. "

Too small to be of any use, try 22µF~100µF for tighter bass.

apexjr.com

Ian Finch · 12th May 2010, 11:24 AM

That's a very big "bypass cap". I think we're talking of those greencaps and axial polyester film types that were common fits across electros. These seem to be arbitrary at 100-500nF. I believe someone claimed that the inductance of big electros prevented them from properly bypassing high frequency noise. A 100nF capacitor would solve the problem by "taking care of the high frequencies" That someone may also have had a healthy sales increase thereafter. '

infinia · 12th May 2010, 11:34 AM

djk has the answer
1) bulk caps at ApexJR
2) bypass using small HQ electros

11th May 2010, 06:13 PM	#1
embrown057 diyAudio Member Join Date: May 2010 Location: Florida	Another 555 question This is my first post on you site , I do apologize for asking the same questions others have made but I seem to be having a hard time gathering what I need. I only have two simple questions: On the older 555 what is the value of the bypass caps to be across the larger 15k caps. Second: Where do most purchase the replacement 15k@100vdc caps at? I have checked around any anything close at Mouser has a 14wk lead time. I was thinking of replacing them with a low ERS, high ripple cap @105c. Nichicon has such a cap p/n=LNT2A153MSE that looks good but same long lead time. There is also some 18k@100vdc on EBAY but I have no idea if these are counterfeit and I do not want to change the value of the cap. Please any suggestions would be great. I used to work in the audio field in the 70’s at Solid Sound in Bolder and M.E.R in Denver, so I do have a good background in repair.

12th May 2010, 06:40 AM	#2
Mooly diyAudio Moderator Join Date: Sep 2007	Seeing 555 I automatically think timer... maybe others looking at the thread title think the same... maybe you do mean 555 timer hmmm with 15k ? 15000uf ?? maybe not. __________________ ------------------------------------------------------- *A simulation free zone.* *Design it, build it, test it.*

12th May 2010, 07:42 AM	#3
Nrik diyAudio Member Join Date: Feb 2005 Location: Copenhagen	Or a Sanyo integrated amp. __________________ STOP - Hammertime!

12th May 2010, 08:38 AM	#6
infinia diyAudio Member Join Date: May 2005 Location: Californication	I love 555's but 888's are infinitely better __________________ like four million tons of hydrogen exploding on the sun like the whisper of the termites building castles in the dust

12th May 2010, 10:54 AM	#8
djk diyAudio Member Join Date: Feb 2001 Location: USA	"On the older 555 what is the value of the bypass caps to be across the larger 15k caps. " Too small to be of any use, try 22µF~100µF for tighter bass. apexjr.com __________________ Candidates for the Darwin Award should not read this author. Last edited by djk; 12th May 2010 at 10:57 AM.


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12th May 2010, 08:35 AM	#5
data Account disabled at member's request Join Date: Jul 2007 Location: Brisbane	Or is it the Sansui AU-555? 15000uf@100vdc caps...hmm...maybe not

12th May 2010, 09:53 AM	#7
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	14hrs since posting and Embrown is silent. Does he want our help?

12th May 2010, 11:24 AM	#9
Ian Finch diyAudio Member Join Date: Apr 2010 Location: Coffs Harbour, on the east coast	That's a very big "bypass cap". I think we're talking of those greencaps and axial polyester film types that were common fits across electros. These seem to be arbitrary at 100-500nF. I believe someone claimed that the inductance of big electros prevented them from properly bypassing high frequency noise. A 100nF capacitor would solve the problem by "taking care of the high frequencies" That someone may also have had a healthy sales increase thereafter. ' __________________ regards

12th May 2010, 11:34 AM	#10
infinia diyAudio Member Join Date: May 2005 Location: Californication	djk has the answer 1) bulk caps at ApexJR 2) bypass using small HQ electros __________________ like four million tons of hydrogen exploding on the sun like the whisper of the termites building castles in the dust

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