lm1036 question - 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 14th December 2007, 05:27 AM   #1
diyAudio Member
Join Date: Nov 2007
Send a message via AIM to synthius
Default lm1036 question

Can a lm1036 be used as a preamp?

It is a tone/volume control chip I am thinking of using in my lm4780 ampifier.The lm1036 works well with voltages between 100mV-300mV .

Also what voltages come from the typical DVD players/ TV outputs?
  Reply With Quote
Old 14th December 2007, 07:33 AM   #2
Dxvideo is offline Dxvideo  Turkey
diyAudio Member
Dxvideo's Avatar
Join Date: Nov 2003
Location: Turkey
Send a message via Yahoo to Dxvideo
You may have some problems with high level input signals. Like DVD/CD-Player output (2V rms). I think you must put a voltage divider (like 47K/12K) and keep amplifiers gain high. Because this chip can handle up to 800 mV input signal with 1% THD! And without any gain. That means you will have 800mV max signal at the output.
For example;
If you have a CD or DVD player... Then you have 2V RMS on input. So you must reduce the signal level down to ~500mV. With this level and 12v supply, you will have 0.2% THD (which is acceptable) for 1Khz (For 10Khz worst) And the chips max gain is 0dB. Then you will have 500mV on output.
So if you want to get 44-45W into 8 ohm with of course +/-30v supply, then you will need 49,5X voltage gain (33,9dB) that a bit dangerous I think. (33K/680R NFB line)
I think you can find a better alternative fot that position instead of LM1036..
Thats a good and simple example...
Best regards,
  Reply With Quote
Old 17th December 2007, 08:32 PM   #3
diyAudio Member
Join Date: Apr 2005
Location: In the Wild, Wild West
The LM1036 does not do any amplifying so the answer is no to the preamp question. The LM1036 is just a TVB and not a great one at that. Check around for some better solutions if you want better.

  Reply With Quote
Old 19th December 2007, 12:51 AM   #4
diyAudio Member
Join Date: Nov 2007
Send a message via AIM to synthius
thanks guys, I've checked around and found a better solution.
  Reply With Quote
Old 15th January 2008, 08:43 AM   #5
cwteoh is offline cwteoh  Malaysia
diyAudio Member
Join Date: Sep 2003
Location: Penang, Malaysia
you mean you have a solution for LM1036? or you have different system to build?
C.W. Teoh
  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
LM1036 (help) yikchean Chip Amps 3 21st November 2006 01:54 PM
Lm1036 Nordic Chip Amps 2 2nd November 2005 06:42 PM
LM1036 + Eagle Pcb metal Chip Amps 0 21st October 2005 10:01 PM
Using LM1036 Papageoff Chip Amps 2 20th November 2004 08:53 PM
TDA1554Q and LM1036 question Wilson2004 Solid State 4 13th July 2004 01:56 AM

New To Site? Need Help?

All times are GMT. The time now is 08:12 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