normal X-Amp

[GeDeon]

I build this amplifier

Kind time of day by all!
Apologize for English - composed by the program interpreter.
I am going to build this amplifier and at me to a question me of a column on 6 îì, theoretically this amplifier 300W of target capacity - me can not is necessary so much. I would like to limit to its feed approximately up to 100 face values and 200 peak.
How it is better for making?

 

[GeDeon]

And still...
Uli, you have circuit of a power unit for it?

 

[kilowattski]

Uli,

Would you be so kind as to share the Gerber files? I have access to an X-Y router designed to make prototype pc boards. I would like to try your circuit. Also did you say the schematic was in another thread?

 

[lumanauw]

Hi, Uli,

Nice works you have. But I'm confused. Which design is for me? There is X-amp, XA1-V2, XA1-V3 and your desing in "back engineered" thread. I'm looking for class AB (less heat), but good sounding.

In the XA1-V3, you didnt use CCS for the lower part of 9620 (only using 1k6+910R), like you use in x-amp (IRF620). In the "back engineered " design there are so many pots to adjust.

Is it possible to eliminate the 100R source resistor, replace with 1 CCS (like zen ver 7)? This will give tighter signal coupling like alephx. How to make this idea with minimal number of adjusting pots?

 

[uli]

Back to civilisation

Hi folks,

I hope I´m back again to the civilized world

Had lots of trouble getting my evening university loving

me again.

So, the X-Amp is the class AB highpower thingy.

PSU: I recommend a toroid of about 2x25 - 2x28 V

and every single Ampère you can get (at least 2x 12A for one

channel) plus CRC 4 times 47mF and 2x0R22.

The drivervoltage you can do by bootstrapping the powerPSU

or with a second tiny supply.

Lastly I am sorry, I cannot supply Gerberfiles.

I own a university full version of Ultiboard without Gerber

Uli

 

[uli]

Hi, Uli,

Nice works you have. But I'm confused. Which design is for me? There is X-amp, XA1-V2, XA1-V3 and your desing in "back engineered" thread. I'm looking for class AB (less heat), but good sounding.

In the XA1-V3, you didnt use CCS for the lower part of 9620 (only using 1k6+910R), like you use in x-amp (IRF620). In the "back engineered " design there are so many pots to adjust.

Is it possible to eliminate the 100R source resistor, replace with 1 CCS (like zen ver 7)? This will give tighter signal coupling like alephx. How to make this idea with minimal number of adjusting pots?

Hi,

basically XA1v2 and v3 are the same circuits.

Single ended Class A, but with complementary MosFets.

the "lower part" is a "Aleph" current source with P-Fests



X-Amp is an X-Series clone (cl. AB)

Uli

 

[GeDeon]

Hi Uli!
For me question - can this amplifier work in a class À?
Or essentially is not present?

 

[GeDeon]

And still - what radiators (area or dimensions) you use?

 

[uli]

Hi Uli!
For me question - can this amplifier work in a class À?
Or essentially is not present?

V2 and V3 work only in single ended Class A very similar

to Pass Aleph. X-Amp is intended to work in AB

And still - what radiators (area or dimensions) you use?

I exclusively use Fischer SK 157 ( dont kill me if this number

is wrong its 6" x 12" with 3.25" long fins)

Uli

 

[GeDeon]

Thank you , Uli!
Now I know their area and I can order same at home🙂 🙂 🙂

 

[GeDeon]

What temperature of your radiator?

I have found this radiator, also has counted its area and has found out that it is possible to make it not 150ìì - 200, thus 0.2 K/W.

 

[GeDeon]

I count - should be in area of 58-60 degrees?

 

[uli]

heatsinks

the Fisher has about 0.25°/W.

As I use 2 pieces for one monoblock including

a front which is black anodised Alu: 17"x6,5"x0,5"

this leadsto a total of about 0.1°/W which is enough

for about 350W idle power (2x35V 5A)

Uli

 

[pinkmouse]

Hi Uli

What format are your files in? I can't seem to be able to open them...🙁

 

[GeDeon]

Acrobat reader

Unzip them and open with AcroRead 6.01

 

[punchpeanut]

I know this thread has been dormant for a while, but I had a question.

The scale reads 24%, which gives me an odd number when I calculate it. It makes more sense if the file board size normalized to 8" x 12", is that right? It seems kind of big, most of the places I have looked at for pre-sensitized boards carry 8" x 10". Where do you get the boards to etch?

Thanks,

Peanut

 

[uli]

scale error

Hi,

this 24% is not to scale as I printed directly to pdf-maker
from Ultiboard. The actual size of the pcb is 4" * 6"

sorry!

Uli

 

[punchpeanut]

Thanks, I was starting to think that. I printed out one at 400% enlargement and it had some pretty big diodes on it!

Thanks for the layout, I can't wait to try it out!

Peanut

 

[uli]

2 flaws

Be careful, the layout in the first postings has 2 design flaws:

1) missing connection betwwen drain of Q21 and the join of

R51 (trimmer - wiper) and R65

2) missing connection between drain of Q7 and +node of C7

These connections can easily be made with normal hookup wire.

I am very sorry for that, but I simply forgot to mention this, as I

did not redesign the pcbs, mine are corrected with wire too!

Uli

 

[punchpeanut]

Cool, thanks for the info, otherwise I would have been scratching my head trying to figure out what went wrong.

Would you happen to have an pics of your completed PCB's. I'd like to see how you stuffed it.

Peanut