Revisiting some "old" ideas from 1970's - IPS, OPS

[thimios]

OK, for 2SK146:
- R6, R10 = 22R
- C2 = 100pF

Measured performance at 1 KHz is going to be roughly the same, distortion at 20KHz will be roughly doubled/tripled. Although, it will be interesting to know your listening impressions, as well as its performance from the noise point of view.

Thanks again,as soon as this will be alive we can try 3 options.😉
Regards.
Thimios

 

[thimios]

Hi Valery, for the AX-DELUXE i have for C11 10pf instead of 8p2
for C13 1.5pf instead of 1pf
R22,R23 560k instead of 680k
Are these values so critical?
Is it needed a heatsink for the VAS at +/-50V?

 

[vzaichenko]

Hi Thimios, those values are fine.

Cheers,
Valery

 

[thimios]

Hi Thimios, those values are fine.

Cheers,
Valery

Thanks!
Small progress.A mix of smd&th parts.😀

 

[vzaichenko]

Thanks!
Small progress.A mix of smd&trh parts.😀

Huh! Cool ))
SMD pads are convenient enough for soldering TH parts on the test boards.

 

[thimios]

What is the recommendation for the red leds,and what about the VAS heatsink at +/-50V?Is it necessary?

 

[vzaichenko]

I normally use pretty standard 3mm / 5mm Kingbright LEDs.
Small snap-on or plate heatsink is recommended for better VAS current stability.

 

[thimios]

Just a little before the finalizing!

 

[vzaichenko]

Cool 😎

 

[thimios]

AX-Deluxe

Now is completed!
Maybe i can test this during this Weekend.

 

[thimios]

AX-Deluxe

More photos.
The official site: High Fidelity Audio Equipment | Canada | VIRTUAL ZERO AUDIO

 

[Samuel Jayaraj]

Can someone point me to the Shunt Power Supply schematic which was posted by vzaichenko in one of his threads. Thanks in advance.

 

[jwilhelm]

Can someone point me to the Shunt Power Supply schematic which was posted by vzaichenko in one of his threads. Thanks in advance.

CF-FET V2.0 front-end - going high-tech (SMD)

 

[vzaichenko]

Can someone point me to the Shunt Power Supply schematic which was posted by vzaichenko in one of his threads. Thanks in advance.

Here we go:

http://www.diyaudio.com/forums/solid-state/270402-cf-fet-v2-0-front-tech-smd-11.html#post4299722

Cheers,
Valley

 

[vzaichenko]

Almost same time 😀

 

[Samuel Jayaraj]

Thank you very much, jwilhelm and vzaichenko. I read through that whole thread again. Such an inspiring read.

I want to use the Shuntie to power a front end which draws 32mA with rails of +-32 to 35 volts DC. I will try without changing any values. Thanks again.

 

[vzaichenko]

Thank you very much, jwilhelm and vzaichenko. I read through that whole thread again. Such an inspiring read.

I want to use the Shuntie to power a front end which draws 32mA with rails of +-32 to 35 volts DC. I will try without changing any values. Thanks again.

No problem - with 32mA draw it's going to run just fine.
You have to reserve some voltage to drop at the series resistors.
In my case, I had 70V DC in -> 50V DC out.

Cheers,
Valery

 

[Samuel Jayaraj]

Oh, that sounds good. Vzaichenko, what is the minimum voltage drop I can get away with and what then would be the value of the series Resistor?

 

[vzaichenko]

You need to have the current through the MOSFET to be at least the same, as the one, drawn by your circuit, loading it.

In this case:
Iinput = Imosfet + Iload -> 64mA = 32mA + 32mA;

Series resistor value:
R = Vdrop / Iinput;

Series resistor power rating:
P = Vdrop * Iinput;

Cheers,
Valery

 

[thimios]

Trying to attach images this way.