The gain is 2.1 times.
Although it is missing in this circuit diagram, there is actually a 47u electrolytic capacitor between the power supply and ground.
Line input 0.5Vrms and output 1Vrms.
At this time, the VT62 full-stage differential amplifier in the latter stage reaches the maximum output, but such an output has never been output from the speaker.
I can't put it out in my environment.
I think I usually listen at a few milliwatts to a few tens of milliwatts.
Therefore, when proceeding to the case set in the future, I am thinking of biting an attenuator about 0.15 times the output of the flat amplifier.
Of course, I will make it a switching SW type and add 1x and mute.
Discrete Power OP-Amp
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