Since the Tripath chip is oscillating at a very high frequency; unlike a typical linear amplifier, a normal digital meter might not be the correct tool to measure the offset voltage of the part?
Does the Charlize sounds anything wrong?
Does the Charlize sounds anything wrong?
There's nothing that SOUNDS wrong, in fact the Chalrize is dead quiet when the source is unplugged /or a clean source like a DAC is plugged in. But that may be because I have 86dB speakers.
eVITAERC
Yeo has stated in a different thread here that he tested the Charlize with 100db speaker and the noise is not a problem.
Since 'she' does not sound anything wrong; enjoy her company and how she can 'tease' you through your speakers 😉
Yeo has stated in a different thread here that he tested the Charlize with 100db speaker and the noise is not a problem.
Since 'she' does not sound anything wrong; enjoy her company and how she can 'tease' you through your speakers 😉
eVITAERC,
I may have found the problem that you're having.
Soldered in a brand new electrolytis cap for the input coupling and the output offset went up quite a bit on my Charlize. Measured the input biasing voltage and found about 2.45V on the
positive terminal of the new cap and about 2.49V on the existing input cap. Tried a second new caps and the result is the same.
A quick calculation indicated that biasing voltage via the resistor
is supplying a current of about 125uA to the input electrolytis cap.
All the caps are from the same manufacturer and type. Only thing is the exisiting one is used for abot 2 weeks while the others are un-used.
I would say that let the input cap 'run-in a bit and then check
the output offset voltage again.
I may have found the problem that you're having.
Soldered in a brand new electrolytis cap for the input coupling and the output offset went up quite a bit on my Charlize. Measured the input biasing voltage and found about 2.45V on the
positive terminal of the new cap and about 2.49V on the existing input cap. Tried a second new caps and the result is the same.
A quick calculation indicated that biasing voltage via the resistor
is supplying a current of about 125uA to the input electrolytis cap.
All the caps are from the same manufacturer and type. Only thing is the exisiting one is used for abot 2 weeks while the others are un-used.
I would say that let the input cap 'run-in a bit and then check
the output offset voltage again.
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