input coupling capacitor VALUE & BRAND for mono LM4780 - diyAudio
Go Back   Home > Forums > Amplifiers > Chip Amps

Chip Amps Amplifiers based on integrated circuits

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 2008, 05:08 PM   #1
diyAudio Member
 
Join Date: Feb 2007
Location: Quebec
Post input coupling capacitor VALUE & BRAND for mono LM4780

Hello !

I have many questions !

I built mono gainclone with LM4780 Peter Daniel KIT with 50K ALPS volume control. (my source is CD player)

*I want add coupling capacitor but what VALUE 1uF or 4.7 uF or 2.2uF ?
and what BRAND ? (easy available in Canada). SOLEN 250v Metallized Polypropylene sounding great or not ?

*I view many people put WIMA MKP 470pF capacitor to ground after the coupling capacitor it's noise filter ???

*it's great idea to add ZOBEL filter with WIMA cap on this amp or not ???

*what's the best resistor type for upgrade sound quality of this KIT ?
exemple: change all for 1% tolerance or change for all carbon film ???

thanks in advance !!!

nicK
  Reply With Quote
Old 11th May 2008, 08:25 PM   #2
diyAudio Member
 
Join Date: Feb 2007
Location: Quebec
okay you need exemple :

if I create Gainclone LM4780 only with two brand.

HOLCO or DRALORIC for ALL resistor
and
ELNA Cerafine & ELNA LPO for ALL capacitor.

the result will be what ? better sound Q than original DIY kit ?

thanks !

nicK
  Reply With Quote
Old 11th May 2008, 08:27 PM   #3
ygg-it is offline ygg-it  Italy
diyAudio Member
 
Join Date: Feb 2008
May be usefull to read:

Input Capacitors for Headphone Amps by Warren Young

http://tangentsoft.net/audio/input-cap.html
http://web.engr.orst.edu/~brownth/CouplingCap.pdf



Use the following formula:
C> 1/ (4* PI* R)
  Reply With Quote
Old 13th May 2008, 04:33 AM   #4
diyAudio Member
 
danielwritesbac's Avatar
 
Join Date: Nov 2007
Default Re: input coupling capacitor VALUE & BRAND for mono LM4780

Quote:
Originally posted by nickthevoice
Hello !
. . . I built mono gainclone with LM4780 Peter Daniel KIT with 50K ALPS volume control. (my source is CD player)
. . .I want add coupling capacitor but what VALUE 1uF or 4.7 uF or 2.2uF ? and what BRAND ? (easy available in Canada).
. . .I view many people put WIMA MKP 470pF capacitor to ground after the coupling capacitor it's noise filter ???
. . .what's the best resistor type for upgrade sound quality of this KIT ?
nicK
One input filter cap is documented by Audiosector, and that's Blackgate N 4.7uf. Since that's a "known good" then I'd find one.
Other capacitors can provide a different variety; however, pricepoint doesn't relate to success, and brand doesn't relate to success.
The most expensive method is to make random selections. If you do that, try a small collection of "favorites" because that's closer to a "known good" than a random selection.

RF cap: The capacitor that you often see added in parallel to the input impedance resistor, is to block RF. That can be helpful to restrict the amplifier to ampifying only audio. As for myself, I use a 3 cent ceramic 330pF.

Best resistor types (as in "known good" components) are documented at the Audiosector web site.

Best, in of itself, means "application specific" not brand nor price.

If you continue to have trouble, suspect an impedance mismatch between amplifier and source. Use a preamp/buffer to fix that.
__________________
Tools, Models & Software for DIYClipNipper boostLM1875 TurboPowerful TDA7293 kitTDA7294 pt2pt ♦ My post has opinion.
  Reply With Quote
Old 13th May 2008, 12:57 PM   #5
diyAudio Member
 
Join Date: Feb 2007
Location: Quebec
THANKS !!!
  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
Two Brand New Plitron 2x22 300va Torroids + lm4780's complete! JHelms Swap Meet 15 1st July 2009 01:37 AM
balancing of input coupling capacitor VHF man Solid State 2 16th December 2008 12:42 PM
Calculating values for input coupling capacitor officeboy Chip Amps 14 29th January 2006 04:41 PM
mono power amp using LM4780 hypnotize Chip Amps 4 7th February 2005 07:50 AM


New To Site? Need Help?

All times are GMT. The time now is 06:42 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