tech-diy LM4780 board 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 13th January 2007, 01:48 PM   #1
diyAudio Member
Join Date: Nov 2002
Default tech-diy LM4780 board questions

I just received some LM4780 boards this week. I downloaded a schematic and I am wondering if there is a mistake in the downloaded copy. It shows C6 as a 4.7 uf value and has provisions to install (2) 100uf caps in series. Should this be (2) 10uf caps in series? Actually would the value be critical at all since it is the Ci to ground?

The gain on the non-inverting side of the amplifier looks like it would be 10.7 and the gain on the inverting side looks like 11.7

Am I not seeing things clearly?
  Reply With Quote
Old 13th January 2007, 02:06 PM   #2
diyAudio Member
jackinnj's Avatar
Join Date: Apr 2002
Location: Llanddewi Brefi, NJ
the gain on the non-inverting side is 1 + R1/R2 (it's just an opamp on steroids), the inverting side gain is just the ratio of the two resistors.

you have the option of lowering the f3 of the amplifier by using larger coupling caps -- fwiw I used 4.7 uF polypropylene in the AX article.
  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
Another Single Side LM4780 Board.. Dxvideo Chip Amps 16 4th December 2012 07:43 PM
LM4780 Eval Board Wynand Chip Amps 0 9th December 2005 08:24 PM
My LM4780 Board Kevin Haskins Chip Amps 32 14th February 2005 10:19 PM
Anagram Tech upsampling DAC board set Ric Schultz Swap Meet 1 4th May 2002 04:13 AM

New To Site? Need Help?

All times are GMT. The time now is 06:15 PM.

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