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Old 14th December 2007, 05:27 AM   #1
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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?
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Old 14th December 2007, 07:33 AM   #2
Dxvideo is offline Dxvideo  Turkey
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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..
http://sound.westhost.com/project02.htm
Thats a good and simple example...
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Old 17th December 2007, 08:32 PM   #3
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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.

-SL
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Old 19th December 2007, 12:51 AM   #4
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thanks guys, I've checked around and found a better solution.
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Old 15th January 2008, 08:43 AM   #5
cwteoh is offline cwteoh  Malaysia
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you mean you have a solution for LM1036? or you have different system to build?
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