LM4765 / LM4766 Bridged - 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 15th November 2009, 06:11 PM   #1
diyAudio Member
 
Join Date: Oct 2009
Default LM4765 / LM4766 Bridged

I was wanting build a LM4766 in BTL, but am finding it difficult to find a schematic for this. The diagrams in the datasheets are sparse in detail to say the least. I know there are probably better chips out there, but wanted to make something p2p that would fit onto a single heatsink (i.e. not two LM3886's and the LM4780 is too delicate to work with - the whole LM4766 current capability issue)

I have subsequently found this diagram for a LM4765 and I am assuming that it is pin for pin the same as the LM4766. What would be the simplest mod to this diagram to convert the amp into a BTL.

Is it as simple as changing the inputs on one of the amps (pins 7 & 8) to make it into an inverting amplifier and then using the two outputs to drive a speaker (omitting ground of course).

Also if I was not wanting to use the mute and standby functions do I have to tie the pins down to ground or do I leave them not connected.

All help appreciated.

[IMG]Click the image to open in full size.[/IMG]
  Reply With Quote
Old 15th November 2009, 06:25 PM   #2
AndrewT is offline AndrewT  Scotland
diyAudio Member
 
Join Date: Jul 2004
Location: Scottish Borders
Hi,
when you convert one chipamp to inverting, the gain of that chipamp changes and similarly the input impedance changes. This further alters the RC time constants affecting the frequency response.
Far better to generate a dual polarity signal outside the chipamps and keep the chipamps either both inverting or both non-inverting.

There are lots of threads covering this topic.
__________________
regards Andrew T.
  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
Lm4765 Pcb pinkmouse Chip Amps 14 19th July 2013 02:14 PM
Bridged LM4766 resistor wattages ballsingtripp Chip Amps 18 12th March 2009 07:22 AM
Which pcb is better (LM4766) linket Chip Amps 5 8th November 2005 10:00 AM
Why not use LM4766?and... Richard.C Chip Amps 5 24th August 2004 08:13 PM
PCB for LM4765? Eccu Solid State 0 17th May 2002 07:26 AM


New To Site? Need Help?

All times are GMT. The time now is 11:01 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