Another 555 question - diyAudio
Go Back   Home > Forums > Amplifiers > Solid State

Solid State Talk all about solid state amplification.

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 11th May 2010, 06:13 PM   #1
diyAudio Member
 
Join Date: May 2010
Location: Florida
Default 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 70s at Solid Sound in Bolder and M.E.R in Denver, so I do have a good background in repair.
  Reply With Quote
Old 12th May 2010, 06:40 AM   #2
Mooly is offline Mooly  United Kingdom
diyAudio Moderator
 
Mooly's Avatar
 
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.
  Reply With Quote
Old 12th May 2010, 07:42 AM   #3
Nrik is offline Nrik  Denmark
diyAudio Member
 
Join Date: Feb 2005
Location: Copenhagen
Or a Sanyo integrated amp.
__________________
STOP - Hammertime!
  Reply With Quote
Old 12th May 2010, 08:33 AM   #4
godfrey is online now godfrey  South Africa
diyAudio Member
 
Join Date: Nov 2009
Location: Cape Town
Quote:
Originally Posted by Mooly View Post
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 View Post
...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)
  Reply With Quote
Old 12th May 2010, 08:35 AM   #5
data is offline data  Australia
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
  Reply With Quote
Old 12th May 2010, 08:38 AM   #6
infinia is offline infinia  United States
diyAudio Member
 
infinia's Avatar
 
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
  Reply With Quote
Old 12th May 2010, 09:53 AM   #7
AndrewT is offline AndrewT  Scotland
diyAudio Member
 
Join Date: Jul 2004
Location: Scottish Borders
14hrs since posting and Embrown is silent.
Does he want our help?
__________________
regards Andrew T.
  Reply With Quote
Old 12th May 2010, 10:54 AM   #8
djk is offline djk
diyAudio Member
 
djk's Avatar
 
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 22F~100F for tighter bass.

Click the image to open in full size.

apexjr.com
__________________
Candidates for the Darwin Award should not read this author.

Last edited by djk; 12th May 2010 at 10:57 AM.
  Reply With Quote
Old 12th May 2010, 11:24 AM   #9
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
  Reply With Quote
Old 12th May 2010, 11:34 AM   #10
infinia is offline infinia  United States
diyAudio Member
 
infinia's Avatar
 
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
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
555 Keyboard Growf911 Instruments and Amps 24 25th March 2009 05:39 AM
Gfa 555 rocketmannj Solid State 0 13th October 2008 10:50 PM
Pop a 555! Duo Everything Else 4 7th February 2007 11:27 AM
Question about 555 timer circuit with relays Ralph Parts 27 9th October 2004 11:53 AM


New To Site? Need Help?

All times are GMT. The time now is 10:59 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2