100W Ultimate Fidelity Amplifier

AndrewT · 2014-01-10 11:41 am

JOHN BALI said:
......... ..............
This amp will be used in the school that I was there long time ago.
I build it for my teacher there in the school & He and all the students there must be like the sound ........

Now seal the fan to the heatsink so that all the air passing through the fan also passes along the heatsink to the far end.

Dacz · 2014-01-10 4:08 pm

JOHN BALI said:
So I adjust the bias, the 1k resistor must be increased.

Regards

hi john.. how much value did you use for 1k? and how much bias did you set for your AX20?

thanks..

JOHN BALI · 2014-01-11 12:13 am

QQ12e5k1 said:
Great job Bli...

Sip thanks Mas Reski, ditunggu AX-nya sampean

I'm waiting your AX-series build

thimios said:
Hi John and happy new year to all of us
Is this pcb for sharing?
Best regards.
Thimios.

Hi Thimios, do you gonna build this one too?
This PCB have some error (the electrolyte need bigger room

)
but working fine,
if you want I will send you the file.

AndrewT said:
Now seal the fan to the heatsink so that all the air passing through the fan also passes along the heatsink to the far end.

Dear AndrewT, Thanks for your suggestion.
When closed, the case & heatsink + 2 fans already form good air flow so the temperature is very stable. I've run it more than 12 hours a day (but not so loud)

Dacz said:
hi john.. how much value did you use for 1k? and how much bias did you set for your AX20?

thanks..

Hi Dacz,
I add 470ohm resistor in series with 1k, take a better look at the picture

you can see a resistor mounted off-board

With 1k I can't set the bias.
With 1k470 I can easily set bias to 14mV on 0R33 resistor
(bias at 10mV on 0R33 is enough).

but I can't measure DC offset because it is zero

Regards

AndrewT · 2014-01-11 11:06 am

if your meter can consistently read 10mVdc and 14mVdc, then it should be able to read 1 to 2 mVdc of output offset.
I don't believe your offset is always less than 0.05mVdc. This is what a 0.0 reading on a 199.9mVdc scale means.

JOHN BALI · 2014-01-11 2:10 pm

I share it & please comment for the layout

AndrewT said:
if your meter can consistently read 10mVdc and 14mVdc, then it should be able to read 1 to 2 mVdc of output offset.
I don't believe your offset is always less than 0.05mVdc. This is what a 0.0 reading on a 199.9mVdc scale means.

I also not believe it at first time, I was build AX-14 with 7-8mV DC offset.

I set the meter to 200mV & the DC offset is 0.00 on one channel and 1mV max on other channel. I think I'm very lucky

(I only match the 2N5401 & glued together)
VAS use BC550B-560B(not matced) MJE340-350 (close hFE)
driver KSE340-KSE350 2SA1837-2SC4793 (not matced)

I think someday I will made it again with zero offset & with the picture to proof it

Kudos for the designer

So here the files for anyone that one to build it...
(It is symmetrical look layout)
PCB size is 50mm * 175mm
& in the .zip there is .DIP file that can be opened with Diptrace

Regards

apexaudio · 2014-01-11 3:57 pm

JOHN BALI said:
I also not believe it at first time, I was build AX-14 with 7-8mV DC offset.

I set the meter to 200mV & the DC offset is 0.00 on one channel and 1mV max on other channel. I think I'm very lucky
(I only match the 2N5401 & glued together)
VAS use BC550B-560B(not matced) MJE340-350 (close hFE)
driver KSE340-KSE350 2SA1837-2SC4793 (not matced)

I think someday I will made it again with zero offset & with the picture to proof it
Kudos for the designer

So here the files for anyone that one to build it...
(It is symmetrical look layout)
PCB size is 50mm * 175mm
& in the .zip there is .DIP file that can be opened with Diptrace

Regards

Nice PCB,
Regards

AndrewT · 2014-01-11 4:13 pm

JOHN BALI said:
......I set the meter to 200mV & the DC offset is 0.00 on one channel and 1mV max on other channel........

You have confused me again.
200.0mVdc or 2000mVdc?
or is it 199.9mVdc or 1999mVdc?
Is you instrument a 2000 count device, or a 20000 count device.

1mVdc and 0.00mVdc seems to be from different instruments? What is the resolution of the scale you have set to?

JOHN BALI · 2014-01-11 4:49 pm

apexaudio said:
Nice PCB,
Regards

Thanks

AndrewT said:
You have confused me again.
200.0mVdc or 2000mVdc?
or is it 199.9mVdc or 1999mVdc?
Is you instrument a 2000 count device, or a 20000 count device.

1mVdc and 0.00mVdc seems to be from different instruments? What is the resolution of the scale you have set to?

Oops, I'm sorry I have miss-type that... :worship:

or I saw it from the back

(I wish I have 0.00mV measuring device)

00.0

that is on the meter
but too bad the amp is not here anymore

AndrewT · 2014-01-11 5:01 pm

and I will guarantee that the 0.0mVdc does not hold constant over a range of operating temperatures, nor from cold start up, through warm up, to fully hot after a period of loud music.

lelut · 2014-01-11 5:21 pm

Hi bli john punapi gatra? (how are u?)

thanks for sharing yours symmetric layout version with 3 tr final,
i hope, i can finis my layout with TO3 tr final (only build one for fun J), and try your version

and i will take your time for many question

BR//
Madde

JOHN BALI · 2014-01-12 1:31 am

Hi Made, so it is you

(your fb's name is different, code S.M.S)
just change the OP's to TO-3 & you will have a robust + symmetrical look

I'm waiting your build here

you can't post here if you find any trouble,
all parts you can buy it in Bali that is the good news
I will help you as I can

Regards

lelut · 2014-01-12 6:39 am

Bli John,

this my design for TO-3 tr final (base on your AX14 layout),
to many blank space

i will try this first before i build your best symmetric design

BR//

JOHN BALI · 2014-01-12 7:24 am

Add protect & clip indicator on blank space

(Or big electrolyte's bank there)

Also move base resistor(R-B) & emitter resistor(R-E) close to the transistors.
BD139 still in middle & 2SA-SC you can move them so the TO-3 have same space
You can mount R-B & R-E in bottom place if that help

kandimba · 2014-01-12 12:09 pm

Apex AX20

Hi mr Mile, first of all happy new year for you and keep healthy with your electronic personal set

. So, here is my second channel AX 20 tested, sounds great, next step, the box. Once more thanks a lot Mile.

Regards

cjkpkg · 2014-01-12 12:15 pm

http://www.diyaudio.com/forums/solid-state/164093-100w-ultimate-fidelity-amplifier-221.html#post3502644

Pivot the to-3 devices...check out willy's layout...very compact.

apexaudio · 2014-01-12 3:09 pm

kandimba said:
Hi mr Mile, first of all happy new year for you and keep healthy with your electronic personal set . So, here is my second channel AX 20 tested, sounds great, next step, the box. Once more thanks a lot Mile.

Regards

Nice work.
Regards

apexaudio · 2014-01-15 3:55 pm

Dacz · 2014-01-18 10:13 am

hi mr. apex,

can i use +/-60v rail to my ax20 (2 pairs)

eljoantonyn · 2014-01-18 11:12 am

Hi !

Can I use his design http://www.diyaudio.com/forums/soli...imate-fidelity-amplifier-221.html#post3502644
to make a pcb and start the build ?
Is this PCB design copyrighted ?

jaagut · 2014-01-18 12:24 pm

Dacz said:
hi mr. apex,

can i use +/-60v rail to my ax20 (2 pairs)

somewhere down this thread, it was posted that the suggested max rails for 2 pairs is +/-60v. i just can't recall the post#.

100W Ultimate Fidelity Amplifier

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