I've found some used LME49810s that I'd like to collect, but I'm having trouble judging if it's genuine. After the production was discontinued, the high price made fakes appear on the market~
Its font seems to be slightly different from 49830, and the stroke lines are a little thicker.
Sadly, for some reason, I'm currently unable to build a circuit to test it.
Previously, I successfully differentiated LME49830 quickly with reference to the experience of others. The pin resistance between VCC/GND of the genuine 49830 is approximately 60kΩ （Pin15 and Pin3）, and that between VEE/GND is approximately 40KΩ (Pin10 and Pin3).
Out of the same idea, I want to know what is the resistance value between VCC/VEE and GND of LME49810, can anyone help me measure it? thank you all😉
Its font seems to be slightly different from 49830, and the stroke lines are a little thicker.
Sadly, for some reason, I'm currently unable to build a circuit to test it.
Previously, I successfully differentiated LME49830 quickly with reference to the experience of others. The pin resistance between VCC/GND of the genuine 49830 is approximately 60kΩ （Pin15 and Pin3）, and that between VEE/GND is approximately 40KΩ (Pin10 and Pin3).
Out of the same idea, I want to know what is the resistance value between VCC/VEE and GND of LME49810, can anyone help me measure it? thank you all😉
Hello friend
As far as I know the 49810 has an optimized shear limiter built in, does it have anything to do with the Baker clamp?
I don't know, just read the following from the datasheet, so is that the reason for attraction towards this chip ?
Unique to the LME49810 is an internal Baker Clamp. This clamp insures that the amplifier output does not saturate when over driven. The resultant “soft clipping” of high level audio signals suppresses undesirable audio artifacts generated when conventional solid state amplifiers are driven hard into clipping.
As opposed to this one, the output from regular speaker amp chips during clipping comes with sudden reduction in loop gain, as there's no longer a proportional change in output vs. error, often causing ringing and sometimes oscillations that are not seen during linear operation.
Unique to the LME49810 is an internal Baker Clamp. This clamp insures that the amplifier output does not saturate when over driven. The resultant “soft clipping” of high level audio signals suppresses undesirable audio artifacts generated when conventional solid state amplifiers are driven hard into clipping.
As opposed to this one, the output from regular speaker amp chips during clipping comes with sudden reduction in loop gain, as there's no longer a proportional change in output vs. error, often causing ringing and sometimes oscillations that are not seen during linear operation.
Resistance measurements of semiconductor devices is meter dependent - different meters will give different results if they use different test currents. One might use 100µA, see a pn-junction and report 0.6V/100µA = 6k, another might use 10µA and report 55k...
The diode test range is more likely to be consistent from meter to meter, since the voltage is reported directly.
The diode test range is more likely to be consistent from meter to meter, since the voltage is reported directly.