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  #1  
Old 12-03-2011, 11:51 PM
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zero_coke zero_coke is offline
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Default What's the absolute best opamp for audio purposes?

I want to build my own amplifier for home and I want to use top-of-the-line stuff...what is the best opamp and transistors I should use? I will be using +/- 15V DC power supply for my amplifier, and my speakers are 60W, 4Ohm speakers.
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Old 12-04-2011, 12:04 AM
Audioguru Audioguru is offline
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With a 30V supply and a single-ended amplifier circuit the power into 4 ohms is only 13.8W. Maybe your speakers are rated at 60W peak which is 30W RMS.

An OPA134 single, OPA2134 dual or OPA4134 quad opamp is excellent. The max allowed supply is 36V.
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Old 12-04-2011, 12:11 AM
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That MC34071 you recommended to me was not functioning well... I went out and bought the NE5532AP and the NE5532AP had way less distortion and better sound quality...and that input coupling you showed me didn't work...when I put those capacitors at the input my entire circuit didn't function for some reason ....I attached the image you showed me. What I did instead was I grounded the Vcc and Vee of my opamps through a capacitor and it worked like a miracle...all the noise suddenly disappeared!!! It was such a drastic and significant change...I didn't know Vcc needed AC coupling capacitors to block the AC induced into the DC power supply....

Oh and I want to make stereo amplifier so I want to build two amps but I only want to use 1 DC power supply. I heard you can offset the opamps so that you can get away with using one Vcc instead of two (Vcc and Vee). How can I do this?
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Old 12-04-2011, 12:16 AM
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You may wish to go with a bridge type output as it doubles the output voltage and multiplies the power by a factor of 4.
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Old 12-04-2011, 12:20 AM
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What's a bridge type output??
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Old 12-04-2011, 12:28 AM
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What's 'absolute best audio opamp'? It not really a technical question for some people, it's more of a flavor question: http://audioreviews.blogspot.com/200...o-op-amps.html

You would think this opamp would be great but who knows. http://www.ti.com/product/opa2134
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Old 12-04-2011, 12:30 AM
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Ugh...I did some googling and I can't decide between these...I've never used any and I don't know which one is the best

OPA627
TL072
AD8610
AD829
AD8033
OPA2134
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Old 12-04-2011, 12:35 AM
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Quote:
Originally Posted by zero_coke View Post
Ugh...I did some googling and I can't decide between these...I've never used any and I don't know which one is the best

OPA627
TL072
AD8610
AD829
AD8033
OPA2134
Anything from Texas is the best.
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Old 12-04-2011, 12:37 AM
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audioguru suggested this bridge output IC in a previous thread--he can probably suggest some others as well as I am not expert here.
http://forum.allaboutcircuits.com/sh...tput+amplifier

What the bridge amp does is to drive both ends of the speaker coil, instead of working against common (ground) as most amplifiers do. While one side is increasing in voltage, the other side is decreasing by the same amount in the negative direction.
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Old 12-04-2011, 12:41 AM
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So which one of these is the best guys?

OPA627
OPA637
TL072
AD8610
AD829
AD8033
AD8620
OPA2134

Price is not a concern (since I'm only going to buy 4).
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