[]|[ GorE]

I was thinking of making a second cmoy with the high output current AD8397 and a TLE2426 for the rail splitting.The AD8397 datasheet states a worst case max current draw of upto 12 mA when powered by +/- 5V . And the TLE2426 is supposed to sink upto 20mA. So,will it work efficiently ?? I will be using headphones under 100 Ohms.

Thanks.

 

[]|[ GorE]

Know of any high output current opamp in DIP for use in the cmoy.the AD8397 is SOIC and browndogs arent available here and i dont want to make my own !

 

[Andrea]

Don't worry about the opamp's current draw. The TLE 'only' has to source the return currents from the headphones (aided by the electrolytics on the split power rails); the opamp's supply current is directly drained from your battery or wall wart.


As for other high current chips, I suggest the OPA551 which is FET input and thus as easy to handle as, say, a OPA134. It can be had in DIP format, but it only exists as a single op-amp so you need to arrange things for 2 chips

 

[]|[ GorE]

This new cmoy will be used only as a portable with my Zen Micro,so battery life is more important for me compared to sound quality.I doubt that the outside noise will let me hear the deepest details in the music,so i am rethinking of using just the OPA2132 or 2 OP551's as you recommend.
what say you ??

 

[Pars]

Quote:

Originally Posted by ]|[ GorE Know of any high output current opamp in DIP for use in the cmoy.the AD8397 is SOIC and browndogs arent available here and i dont want to make my own !

Look at the LM6172. Still cranky to work with (not as cranky as the AD8397 tho). You'll need to read Tangent's article on working with cranky opamps and balance the + and - inputs as you would need to do with the AD8397.

 

[Filburt]

The LM6172 comes in DIP in addition to SOIC. A lot of these high current line drivers do seem to be SOIC only, though, so the 6172 may be unusual in this respect.

 

[Andrea]

Quote:

Originally Posted by ]|[ GorE This new cmoy will be used only as a portable with my Zen Micro,so battery life is more important for me compared to sound quality.I doubt that the outside noise will let me hear the deepest details in the music,so i am rethinking of using just the OPA2132 or 2 OP551's as you recommend. what say you ??

I would suggest going with the OPA551's. The power consumption of the amp 'at idle' would be around 16 mA which is pretty reasonable for battery power.

Just be careful about the supply voltage - the OPA551 can take +/- 4V minimum as opposed to the +/- 2.5V of the OPA2132. Me, I would use 18V or 12V.