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Op Amp. OPA134 substitute used in amplifier primary stage.

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sham_elec

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Dear All,

I want to know OPA134 equivalent, which is not available at present. The same is used for mono power amplifier in the primary stage, and then fed to driver stage using BD139-BD907, BD140-BD908 for the respective driver & output stage.

Can I use LM741 or TLO81/71 pin compatible.

Thanks in advance.

Regards,
Sham_elec
 

Under the assumption that other high performance audio OPs are neither available at your site, TL081 or better TL071 could be a suitable replacement. LM741 is just useless.
 

Hi,

Why do you say OPA134 is not available?

****
LM741/TL081/TL071:
The OPA134 is a specialized high performance Audio OPAMP.
LM741 and the other ones are old and of low performance.

--> The one is a Formula1 car a couple of years ago, the other a standard car form the 1960s.
OK, both cars will bring you from place A to place B. ...

It depends on what you want to achieve.
Therefore you need to decide your own specifications.

Klaus
 

An OPA134 is made by Texas Instruments and is available almost everywhere. Go to www.farnell.com and click on the flag of your country to see if they have any. It has a wide bandwidth then the amplifier designed for it will probably oscillate if a slower TL071 is used. A TL071 is a TL081 selected for low noise.
 

It has a wide bandwidth then the amplifier designed for it will probably oscillate if a slower TL071 is used.
Click to expand...
This might happen in very rare cases, e.g. feedback with lead-lag compensation or active filters that depend on 8 MHz GBW. Rather unlikely for an audio amplifier. More likely the amplifier bandwidth may be slightly reduced. Particularly higher THD can be expected. Unless it's a real "high end" audio design, you probably don't notice the difference.
 

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