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Old 5th March 2015, 06:57 AM   #1
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Default Suggestion required on Audio Preamplifier

Hello,

I need one clarification on audio.

A preamplifier circuit or IC with rated power of >1.2W Mono/BTL or 250mW Stereo is available anywhere?

For a circuit to act as a preamplifier functionality,we require only voltage amplification not votage and current amplification na aa?

Suggest the circuit or IC which will act as preamplifier with the above wattage so that it will drive to another power amplifier of LM4780?
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Old 5th March 2015, 12:01 PM   #2
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You seem to be talking in NE5532 territory, but a bit of clarification.

If all you want to do is drive an amplifier, then wattage doesn't enter in. Amplifiers are commonly driven with a "line level" (nominal 1 volt) audio signal. Is this what you need?

What's your audio source? If it's a CD player or similar then you might not need a preamp at all, or else a small gain of perhaps 5 or so might do. For a microphone a gain of around 500 might be needed.

What DC voltage is available to power the preamp, or do you envision battery power?

If you do need a low wattage audio amp then the LM386 is often used, and can also serve as a preamp: http://www.ti.com/lit/gpn/lm386
.

Last edited by bentsnake; 5th March 2015 at 12:15 PM.
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Old 5th March 2015, 12:11 PM   #3
AndrewT is offline AndrewT  Scotland
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Quote:
Originally Posted by bentsnake View Post
.....................What's your audio source? If it's a CD player or similar then you might not need a preamp at all,..............
Very much so.

Lower level Sources may need a bit of extra gain, but that depends on the sensitivity of the amplifier and the maximum output of the Source.
Have you read?
What is Gain Structure?

You may find that the majority of your Sources and your listening level preferences need attenuation and not gain.
Consider adding a 2times and/or 4times switchable gain stage that only comes "in circuit" when gain is actually NEEDED.
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Old 9th March 2015, 12:08 AM   #4
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Quote:
Originally Posted by suneetha View Post
Suggest the circuit or IC which will act as preamplifier with the above wattage so that it will drive to another power amplifier of LM4780?
NJM2114 or NJM4580 when/if run as parallel amplifiers (Two needed for stereo output).
Functions:
1
Parallel mode has either double the output linearity or can push double the load (music is a highly variable signal, so you'll get both of those functions dynamically).
2
In a parallel amp, some distortion gets eaten by the output ballast resistors, which further contributes to a more pleasant tone.

The low gain preamplifier is good for when LM4780 is used in Inverting mode for the pleasant tone offered by good stability. Inverting mode power amp needs a constant input impedance, which is a fairly good use for a preamplifier--just don't put the volume pot in-between.
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Old 9th March 2015, 02:09 AM   #5
infinia is offline infinia  United States
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Quote:
Originally Posted by suneetha View Post
Hello,

I need one clarification on audio.

A preamplifier circuit or IC with rated power of >1.2W Mono/BTL or 250mW Stereo is available anywhere?

For a circuit to act as a preamplifier functionality,we require only voltage amplification not votage and current amplification na aa?

Suggest the circuit or IC which will act as preamplifier with the above wattage so that it will drive to another power amplifier of LM4780?

most audio op-amps will drive no more than ~ 1K-2K so power output is not usually specified. I think you probably want a buffer circuit with no more than a gain of 2. what information do have that makes you think you need more gain? the data (spec) sheets of your sources and power amp would help in this case!
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