Yes, this is my design.
What exactly don't like OpAmp in power amplifiers, Вася Зайченко?
Sorry!I'm Valery (ok, never mind).
OPAMP introduces much less distortion in schemes such as discussed than in the cascades with a single OPAMP.Well, it's rather subjective... I mean - it's possible to design a good amplifier with an OpAms as well as without an OpAmp (as well as the bad one ), however I prefer having more "control", seeing what exactly is happening in every bit of the power amp.
I like OpAmps in the line stages or some "instrumental" converters though.
Still using a multi-channel subsonic filter in one of my systems, built on Burr-Brown OPA627 chips - it just "does not sound", like it's not there. Full transparency
I ave PM-ed you my email, by the way.
20KHz - 0.032% (measured at 50W @ 8 ohm (с) audio | Project CF-FET V2.0My opinion with regards to MOSFETs - you just have to drive them the right way, especially the HexFETs. OK, yes - they've got the high, non-linear input capacitance - so what? If you drive them with low-impedance emitter follower - not really a problem. On the other hand, they are cheap and very reliable.
See one of my designs here: CF-FET V2.0
A high-speed amp with the right use of HexFETs. The OPS was initially designed by Ostripper with BJTs at the output, later on I have "adapted" it for HexFETs. One of the amplifiers I like a lot.
Lateral FETs are different creatures, but also very good for audio.
By the way, Sansui-inspired design: TubSuMo tube hybrid
Version with BJTs at the input: BipSuMo with BC546B
Measurements with both Lateral FETs and BJT-based NS-OPS (non-switching) are in the next post there.
Sorry, can't bring myself to believe in so much high indicators in this schematic audio | Project VERTICAL audio | Project NS-OPS. Yesterday I tried to squeeze something from a much more sophisticated CFA circuit, but attempts to squeeze at least 0,000.4% failed. A real amplifier will make more of a distortion than an idealized model.
I have been doing audio for nearly 50 years and I have yet to seen a really good relation between perceived sound and the measurements.
Kind regards Vitreus
PS. I don't like opamps either and I have lot of reasons, but I don´t know if they are relevant.
The speed and comfort of the Mercedes is higher than the scooter.Level of sophistication also does not mean anything by itself
But again - VFA option with double-loop feedback and much higher THD - I like the sound even better.
especialy when Mercedes stands still in a traffic jam and the scooter rides on cheaplyThe speed and comfort of the Mercedes is higher than the scooter.
TDouble loop feedback is contrary to the achievement of high linearity themes...
The speed and comfort of the Mercedes is higher than the scooter.
Double loop feedback is contrary to the achievement of high linearity themes. due to its application falls depth feedback and growing differential input voltage - a factor of increasing distortion. It can be good to see on the model.
especialy when Mercedes stands still in a traffic jam and the scooter rides on cheaply
That's good.this ia all about...
for me Vzaichenko got right, THD alone gives nothing and for many listeners -60dB from fundamental is more than enough
however I appreciate your contribution in pushing diy audio forward