Single darlington line preamp.

[beppe61]

Dear Mr. Mike,

first of all thank you very much for your extremely kind and valuable information and advice.
I can only add that I am very eager to know something more about your topology.
Of course in case that you have any intention to disclose that information to us all.

Anyway, thank you so much again.
Kind regards,

beppe

 

[beppe61]

Please excuse me for the bad use of the "POST REPLY" function.
I am very sorry.
Regards,

beppe

 

[Mikhail__K]

I've done a novel distortion cancelation circuit too, that worked very well at gains of 10 or more.

if you use active distortion cancelation then may be low level result. It is interesting to look on the disign.
But for "simple follower" as you mentioned, for BJT the only parameter which define THD is emitter current modulation depth.
For 30% modulation a circut from paper have 0.001% instead of 0.15% for "simple".
For 3% it will be 0.00001%.
For low current modulation you need a high resistors ~10KOhm and current sourses which cut audio quality to minimum due to nonliniar capacitance.
A solution to use active distortion cancelation or feedback.

 

[GEirin]

Amplifier witch VAS darlington

Hi all.

VAS witch modified darlington.
This schematic is good?
Geirin

 

[lumanauw]

Hi, Geirin,

Very interesting VAS What's the resistor values?

 

[GEirin]

Hi lumanauw.

Thank you.
Is only a idea. I not an expert in amplifier designer. I will need help.
Guillermo