Headphone Buffer Amplifier for 32 Ohm. All FET.

[lineup]

This is the Fourier Analysis.
As you can see it is mostly 2nd harmonic.
Higher harmonis are well down.

I will soon post the circuit.

 

[lineup]

The power Supply should be transformer 2x9VAC. Well filtered.

There is nothing really to adjust.
Building it should be straightforward.

The JFET could probably be any other JFET transistor you have.
But best is LSK170 or 2SK170.

Simulation says it is THD like 0.001%

For 32 Ohms headphones there is not necessary to have any voltage gain.
So, a buffer with gain=1 should do fine with modern sources.

 

[Osvaldo de Banfield]

Mmmmmm there is a BJT poisoning the design...

 

[lineup]

😛
You are right.

 

[EUVL]

You can easily duplicate the top half to act as current source for the bottom.
Then it will be all FET. Also try 2SK209GR.

But for desk top, I prefer Fetington to Sziklai any day.
They are a bit nervous for me.


Patrick