LME49810 - a new cousin for LM4702

[AndrewT]

the driver base stoppers are a good safety/stability measure.
Worth adding base stoppers to the outputs as well.
You can delete these after testing, or just change the values, depending on results.

The 68r runs the drivers at near constant current at very low to zero output currents.
Expect ~9mA + output base current as the driver current.

[terranigma]

Originally Posted by panson_hk

This effectively identical to this output stage which driver center tap connects to the output.

With same value of 68R or 0.22R as emitter resistor?

Originally Posted by AndrewT

the driver base stoppers are a good safety/stability measure.
Worth adding base stoppers to the outputs as well.
You can delete these after testing, or just change the values, depending on results.

The 68r runs the drivers at near constant current at very low to zero output currents.
Expect ~9mA + output base current as the driver current.

Are these base stopper resistors are applicable to LME49811 which has only 7ma output current? Or just decreasing the value in case of 49811?

I haven't any oscillator for detecting possible oscillation beyond of audio band. I can do only basic measurements, so, can you suggest me to respect the scheme as what it is or can we claim that avoiding these resistors don't touch final sonic result too much? I rather prefer avoiding resistors for simpler circuit.

I apologize for asking these silly questions, i'm just trying to understand what is it beyond of these kind of variations.

[terranigma]

Originally Posted by terranigma

With same value of 68R or 0.22R as emitter resistor?

Oh, i got what Panson mean now..that was what does it matter between 68R and 68.22R ??

[JonHarrison]

Oh, i got what Panson mean now..that was what does it matter between 68R and 68.22R ??

Except that the current flows differently !

[panson_hk]

Originally Posted by terranigma

Oh, i got what Panson mean now..that was what does it matter between 68R and 68.22R ??

Sure, there is no different for 68R and 68.22R. What I meant is the configuration. The upper/lower driver is still cut-off in negative/positive cycle as that with the center tap connected to output.

if the center tap is not connected to the output, driver will not be off. I prefer this one.

Regarding oscillation, it does not a matter of the driver output current. You will see oscillation in small signal circuit. It is about gain and phase.

If we have base stopper at the output, we may be able to omit the stopper of driver. However, it is also layout/wiring dependent. If test confirms the base stopper can be removed, then take them out in the final version.

The base stopper ensure negative resistance never happens.