The 2.2% i quoted are, as already said , in respect of the original schematic.
The feedback is returned with a 22k resistor , while the non inverting input
is biaised through a 22K + 2.2k resistors , making a built in 10% mismatch.
Replacing just the two resistors by 100K would make a 100K path
for the feedback and 102.2k for the non inverting input , hence the 2.2%.
As said, it s not only a matter of resistors tolerance.....
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Hi, can someone tell me which is the minimum supply voltage for p3a?...or can it work with +/-21Vcc?......thanks
yes it will ..it may start to work from 12+12 volts ..... only you will get some very few watts out of it
kind regards
sakis
kind regards
sakis
It can work with as low as +-5V , but since it use a bootstrap ,
the VAS current will not allow for high output currents as it is
supply voltage dependant , contrary to a current source loaded VAS.
With a +-21V PSU , R9 and R10 should be reduced to about 2.2K.
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