100W Ultimate Fidelity Amplifier

[aneeshchelad]

Replace 33k with 18k

Thank you sir.

 

[prasi]

I want to make this circuit. Can you share the prasi gerber file?

I will today. I just saw your post. Gerbers and pdf

 

[prasi]

I want to make this circuit. Can you share the prasi gerber file?

Here are the files for apex fx-12

 

[fazildiken]

Here are the files for apex fx-12

Thank you Prasi. So glad to have you

 

[Vunce]

here you go..

Apex Shunt psu from post#13477.

I’m getting an output 2v lower than the installed zener diodes.
ZD24 = +/-22vdc output
ZD15 = +/-13vdc output
ZD12 = +/-10vdc output

All examples use appropriate transformer CT secondary voltages: 24v, 15v, and 12v.
Dummy load = 100mA
Is there an adjustment to the resistor values needed to get the correct output voltage?

 

[prasi]

WITH 100mA, you can expect 1V drop across output 10R resistors..... still if you don't see any ripple and you can connect to your pre and see.

 

[prasi]

+ diode drop in TIP122, so you are getting correct voltage, i think.

 

[Vunce]

Thanks Prasi, I’ll play around with zener diode values to get my target output.

 

[prasi]

Just for nostalgia, wanted to make a new layout for classic little Apex FX-8 amplifier. It sounded very good for a simple design.

 

[thimios]

Hi mr.pcb.
I hope you are in nostalgia any time!
Thanks.

 

[prasi]

Yes feeling very nostalgic, this might even be the final amp I build, I liked it then when I built it ages ago..
You never build this one or any lateral mosfet amp.? why?

 

[thimios]

Yes feeling very nostalgic, this might even be the final amp I build, I liked it then when I built it ages ago..
You never build this one or any lateral mosfet amp.? why?

I haven't build this but i have build lateral amplifiers my friend.
Sorry,i haven't build everything!

 

[fazildiken]

Hello Gurpreet,
here is a rough b50 layout.

Hi Prasi,
What is the recommended supply voltage for the Apex B50?

 

[xrk971]

Very nice layout, Prasi. It’s a nice amp.
FX-8 was the inspiration for vertical hexFETS FH-9. Lateral FETs are nice from thermal runaway standpoint and considered HiFi, but having built both, I feel hexFETS have more authoritative bass.

 

[surjitsharmaph]

TL for 8 inch driver.

TL with 8 inch driver

Is it 270 mm overall width dimensions of the speaker box without side wall or with side wall?

 

[apexaudio]

Is it 270 mm overall width dimensions of the speaker box without side wall or with side wall? View attachment 1036089

270mm is with side wall.

 

[prasi]

Hi Prasi,
What is the recommended supply voltage for the Apex B50?

I think since it's a single pair output, you would be safe with 35v.

 

[surjitsharmaph]

270mm is with side wall.

Thanks i'm planning to build it but confused in that area so, confirming overall dimensions H-720mm x B-270mm x D-360

 

[surjitsharmaph]

Thanks i'm planning to build it but confused in that area so, confirming overall dimensions H-720mm x B-270mm x D-360

Now confirmed

 

[Joel Wesseling]

AA9MD - do the output devices need to be matched?

I have AA9MD running for short periods until rail fuse(s) blows. I can listen to the amp but at around one minute the fuse blows.. same when testing the amp with 1khz sine or square wave , everything looks good for about one minute, then rail fuse blows.. Guessing, but appears to be thermal Runaway.. Any suggestions would be helpful, thanks.. I have feedback jumper installed..