Best sounding headphone amp from Wavebourn to Kubeek :)

[kubeek]

...and the circuit.

 

[lineup]

the acutal circuit is actually included in the zip with the board, but I will post them both as pics.

thanks, kubeek
sorry for asking for what already submitted

(I only downloaded the ZIP, without unpack. was going to do this later)


but think now all lazy ones
will get this interesting circuit right up their noses

it deserves to be looked at!


lineup

 

[Wavebourn]

I have to say this Wavebourn guy
has got some good and interesting audio ideas

Thank you Lineup!

I have to tell, I've designed it for free DIY usage, but if somebody wants to use my output stage for commercial purposes you must contact me before for permissions.

 

[Wavebourn]

the acutal circuit is actually included in the zip with the board, but I will post them both as pics.

Let me advise a little bit:

1. Filter caps must be placed near output transostors.
2. Wires to filter caps from power suppy and from filter caps to output transistors must be separated.
3. Ground wire to headphone output must go again from the filter cap.

Never connect power supply between filter cap and input stage.

4. D1 put closer to Q5 so distortions will less depend on temperature.
5. You forgot to put "Wavebourn & Kubeek Designed" lettering on the PCB.

 

[kubeek]

Here is the newest board layout, so check it out!

 

[kubeek]

The board:

 

[kubeek]

And the circuit, the only difference is swapped D1 an R9.

 

[Wavebourn]

Much better now!

 

[kubeek]

What is the best solution to avoid turn-on and turn-off thump?
What about using a relay to short the output through some resistor?

 

[lineup]

And the circuit, the only difference is swapped D1 an R9.

What is the best solution to avoid turn-on and turn-off thump?
What about using a relay to short the output through some resistor?

I will try to do some EWB Multisim testing of this latest version
circuit schematic:
http://www.diyaudio.com/forums/attachment.php?s=&postid=1060316&stamp=1163891588

I only hope I have Spice models of those transistors ...
All Good audio diyaudio transistors were not in the default Multisim distribution.

I call it:
061119_wave_circ2.gif (2006-11-19 posted).
It is a good idea to rename each version in a topic
to make it easier to know this is a different and later version.

Maybe this latest, 061119, should be wave_circ3.gif or wave_circ2_b.gif


lineup

 

[Wavebourn]

What is the best solution to avoid turn-on and turn-off thump?
What about using a relay to short the output through some resistor?

Big C2, resistor in parallal with output socket, "speaker protection" relay.

 

[Wavebourn]

Do you want 200W RMS version of this amp with inaudible distortions?

 

[kubeek]

I personnaly don´t need it since I have more than enough troubles with other amps, but surely there are other DIY members who want to build high-quality amp.
But I want to see the schematic

 

[Wavebourn]

I personnaly don´t need it since I have more than enough troubles with other amps, but surely there are other DIY members who want to build high-quality amp.
But I want to see the schematic

Can you simulate vacuum tubes?

 

[kubeek]

No, I don' t have any simulator with tubes.

 

[kubeek]

Wavebourn, will you post here the 200W version?

 

[kubeek]

Does anyone have some schema for speaker protection, which I could use with this kind of amp?
I was thinking about powering the relay from a separate diode bridge without capacitor, and switching on after some time.

 

[Wavebourn]

Wavebourn, will you post here the 200W version?

Here you go: 2x200W amp that uses the same topology of output stage.
First opamp is an amplifier for the input signal limiter, the second one is a servo feedback amp.

 

[kubeek]

new pcb + delay ckt

So here is the newest board, now it is stereo and with delayed cap-discharging circuit.

Please post your comments, I am not too sure about the hysteresis resistor and the cap, maybe there will be different values.

 

[kubeek]

the circuit: