couple of noob questions. - diyAudio
Go Back   Home > Forums > Amplifiers > Chip Amps
Home Forums Rules Articles diyAudio Store Gallery Wiki Blogs Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

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
Thread Tools Search this Thread
Old 22nd April 2008, 11:36 PM   #1
diyAudio Member
coldfuzion76's Avatar
Join Date: Jan 2008
Default couple of noob questions.

2 quick questions.
I got a good deal on some 15000 uf caps and was wondering if I had to change the snubber values for carlos's design if I were to use these larger caps (seems everyone is using 10000)
and I was wondering if I could use the following circuit from elliott's site for a buffer (with R3 and R4 removed for 0 gain) I got a couple of opa2134's laying around and not much in the way of discrete stuff for a buffer.
Attached Images
File Type: gif p88-f2.gif (2.1 KB, 139 views)
  Reply With Quote
Old 23rd April 2008, 08:53 AM   #2
Nuuk is offline Nuuk  United Kingdom
diyAudio Member
Nuuk's Avatar
Join Date: Feb 2003
Location: Somerset, SW England
I'll leave the snubber question to a snubber fan, but I guess the 15K's would be fine.

As regards the buffer circuit, if you want a gain of 0, just leave the whole circuit out and don't connect anything in its place!

What you mean is that you want no gain, ie a gain of 1, and that is what that circuit will give you, as will the buffer circuits shown here .
The truth need not be veiled, for it veils itself from the eyes of the ignorant.
  Reply With Quote
Old 23rd April 2008, 09:08 AM   #3
Electrons are yellow and more is better!
diyAudio Member
peranders's Avatar
Join Date: Apr 2002
Location: Göteborg, Sweden
Blog Entries: 4
Default Re: couple of noob questions.

Originally posted by coldfuzion76
2 quick questions.
I got a good deal on some 15000 uf caps and was wondering if I had to change the snubber values for carlos's design
I must point out that if you want to eliminate the resonance caused by connecting caps in parallel you must know the caps you plan to use and also the physical placement. Carlos' idea has no scientific value. If you want a predictable effect of these "snubbers" you must have a determined design, both in parts and circuit, pcb etc. The golden rule is at least to keep it compact. Carlos has chosen to have it far apart from the "consumer".

More to read here
/Per-Anders (my first name) or P-A as my friends call me
PA03 LM4780 amplifier group buy, SIGN UP HERE for the group buy 0 boards left. 118 paid.
  Reply With Quote
Old 23rd April 2008, 09:22 AM   #4
AndrewT is offline AndrewT  Scotland
diyAudio Member
Join Date: Jul 2004
Location: Scottish Borders
what is R5L feeding?
This is a very high output impedance for feeding most circuits.

The circuit has a gain of 2times (+6db).

Add an RF filter after the 1k0 input resistor.

And take that ground connection back to the input connector. It is part of the flow and return circuit for the input signal.
regards Andrew T.
Sent from my desktop computer using a keyboard
  Reply With Quote


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
couple of questions slogan2112 Multi-Way 0 27th June 2004 08:38 PM
a couple questions slackerbob Solid State 1 12th August 2003 02:25 AM

New To Site? Need Help?

All times are GMT. The time now is 05:52 AM.

vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright ©1999-2017 diyAudio

Content Relevant URLs by vBSEO 3.3.2