Here I will present my new 10 Watt amplifier.
All you need to play music.
The supply is one transformer 2x12VAC.
Just you wait until I start posting the amplifier.
Here is the idea, simplified.
The opamp controls the amp.
The MOSFETs are biased to about 250mA.
The compensation of the opamp rolls off bandwidth at 200kHz.
Gain is set to 11.
The max output is like 10 Watt RMS.
All you need to play music.
The supply is one transformer 2x12VAC.
Just you wait until I start posting the amplifier.
Here is the idea, simplified.
The opamp controls the amp.
The MOSFETs are biased to about 250mA.
The compensation of the opamp rolls off bandwidth at 200kHz.
Gain is set to 11.
The max output is like 10 Watt RMS.
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I know this.
But there is a slight drawback - you can not get as much power out of the circuit.
The opamp will knock its head into the power supply.
The opamp should be Rail-to-Rail Out. RRO
OPA1641 is this.
Because otherwise you can not get 10 Watt output.
OPA1641 is this.
Because otherwise you can not get 10 Watt output.
If LATFET is too expensive then you can have the similar results with BJTs
Oops Q1 is TIP 41, did not mark it. Transistors swing closer to rail than LATFET. This one THD is predominantly odd order and about 40 micro %/ I can't recall the designer but it stuck in my head because of simplicity. I have no idea what it sounds like. Probably junk but it is easy enough to build on proto board. It may even be a nice headphone amp, who knows.
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I tested OPA1655.
It is almost as good as OPA2156 and also better than OPA1641.
THD 0.00006%
So, now I recommend OPA1655, a single channel opamp.
It is almost as good as OPA2156 and also better than OPA1641.
THD 0.00006%
So, now I recommend OPA1655, a single channel opamp.
No idea, I will run a "simulation" which must be the definitive answer. This is not a competition Line-up only a similar kind of schematic I recall seeing years ago.
Interestingly (I think LTspice also have the function), but you can insert a .WAV file into the input and listen to the simulated music through it for whatever it is worth. It takes quite some time to run the function, even a few second clip takes some time and then it outputs the clip after probably millions of computations. I am not sure why this function exists, maybe to please the designer that it is good or bad sounding. You can even take the output .WAV file and reproduce it through and expensive audio amplifier and speakers. Or maybe compare the two .WAV files in Foobar or something similar. As the saying goes, seeing is believing, not hearsay.
It just inspired me to rip a cut from a song that I know and like, then take the resulting simulated WAV through this amp and play it back through less than mediocre equipment and speakers and try to listen if it is any good or not.