Humble One. Class A Push-Pull 11 Watt. Uses OPA189 opamp.

[lineup]

Hello.

Humble One is a small Class A amplifier.
Output is 11 Watt into 8 Ohm and 12 Watt into 4.
The amplifier uses only parts that are possible to find and buy.

Humble One is controlled by a quality opamp, OPA189, for low distortion.
https://www.ti.com/lit/ds/symlink/opa189.pdf

Output devices are MJE3055T and MJE2955T TO-220 transistors.
https://www.onsemi.com/pdf/datasheet/mje2955t-d.pdf

Bias in output is 1.25A Class A.
The power in each output device is 20 Watt and will produce heat.

Gain is set to x10.
The offset is very low thanks to the CMOS opamp.

Transformer should be 2x12VAC, preferably 100VA.

The circuit is simulated with very good results.

 

[minek123]

Looks like this is the same topology as Philips 22AH578

 

[planet10]

Nice to see you posting HaloJoy. How are you doing?

dave

 

[lineup]

Thanks @planet10 for asking.
I am better because I take medicin.
'Lithium a mood stabilizer that is a used to treat or control the manic episodes of bipolar disorder (manic depression ).'
2015/2016 I got prostate cancer. I was cured by radiation.

Stefan (How we say Steven in Sweden)

 

[lineup]

Looks like this is the same topology as Philips 22AH578

Interesting. Thanks for posting.

 

[planet10]

'Lithium a mood stabilizer... bipolar disorder

My first wife went thru that. I am glad you are feeling better now.

dave

 

[PMA]

Humble One is a small Class A amplifier.
Output is 11 Watt into 8 Ohm and 12 Watt into 4.
The amplifier uses only parts that are possible to find and buy.

Hi @lineup , long time 🙂> Here is something similar by PMA 🙂. Not bad, I would say 😉.

 

[lineup]

Yes @PMA
That's nice!
What OPamp do you use for that circuit?
And what is the voltage supply?

 

[UniQ]

@lineup here :-)
https://www.diyaudio.com/community/...ier-with-thd-below-0-0001.385676/post-7008182