100W Ultimate Fidelity Amplifier

[2pist]

Does anyone have any Xtra (functioning) boards for sale? May be a long winter so I'm preparing to hibernate. I'll see what boards you have and compare to my parts bin.
Thanks!

 

[jimk04]

AB100 and FH9VX spare here

 

[kozard]

here you go.
prasi

Hello Prasi,


https://www.diyaudio.com/forums/solid-state/164093-100w-ultimate-fidelity-amplifier-post4686633.htmlFor some reason JLCPCB can't seem to figure out the gerber files from post #7150. (FX8 Bimo Mod.) It complains about non-standard gerbers, etc.

Could you please replot and post the gerber files so that we can try again with JLCPCB?

 

[prasi]

Hello kozard, I will have a look in the evening and post revised gerbers
Reagrds
Prasi

 

[fabiomaster]

Hello group members, could someone tell me the post number of pcb layout apex ax11 which uses bd139 as Bias transistor? sorry for my bad english. thanks.

 

[clpk]

Look at this
100W Ultimate Fidelity Amplifier

 

[fabiomaster]

Thanks

 

[prasi]

Hello Prasi,


https://www.diyaudio.com/forums/solid-state/164093-100w-ultimate-fidelity-amplifier-post4686633.htmlFor some reason JLCPCB can't seem to figure out the gerber files from post #7150. (FX8 Bimo Mod.) It complains about non-standard gerbers, etc.

Could you please replot and post the gerber files so that we can try again with JLCPCB?

try with these gerbers, this should work.

 

[kozard]

Ok. Thank you.

I uploaded those to JLCPCB (see attached) and in their gerber viewer I wonder if their software is having a problem with the drill holes? In the gerber viewer it looks like the drill holes are missing?

 

[jorgovanko]

They changed gerber view. Not as good as ex one. I have checked gerber in ViewMate Pro and all is OK.

You can check also with gerber viewer placed here China PCB Manufacturer & Assembly - NextPCB

 

[prasi]

Just load them in any Gerber viewer like gerberlogix .
The holes are there;
may be a bug in their online rendering tool

 

[kozard]

Ok. Thank you.

 

[fabiomaster]

Hi group members, all good, first I would like to thank Mile Slavkovic for the excellent projects and for all the members who design the amplifier layouts. I have some doubts and if anyone answers I will be grateful, I set up the apex ax11 amplifier with 2sc5200 and 2sa1943 output transistors, with bd139 as Bias, what are the acceptable values ​​of the Bias adjustment?
Is it normal for the mje340 and 350 to get so hot?
Can i replace with tip 41 and tip42?
And which resistor is responsible for increasing the gain?
I set up the pcb for this post
100W Ultimate Fidelity Amplifier

 

[fabiomaster]

I was forgetting, in this apex ax11, what is the acceptable voltage of offset?

 

[kandimba]

Hi fabiomaster, normaly people try to get 0V on bias, but its normal to have 10mV until 100mV. In order to get less bias, you must match the HFE input transistors.

Regards

 

[prasi]

Hello kandimba,
I hope you mean DC offset measured from speaker output to ground.

 

[fabiomaster]

Hello Kandimba, is this dc measurement on the sound output or on the output transistors?

thank you for answering.

 

[kandimba]

Has Prasi said, (Hi Prasi ) this mesurement should be done with input shorted, across output and ground.

Regards

 

[fabiomaster]

alright dear, thanks for the replies.

 

[prasi]

Hi group members, all good, first I would like to thank Mile Slavkovic for the excellent projects and for all the members who design the amplifier layouts. I have some doubts and if anyone answers I will be grateful, I set up the apex ax11 amplifier with 2sc5200 and 2sa1943 output transistors, with bd139 as Bias, what are the acceptable values ​​of the Bias adjustment?
Is it normal for the mje340 and 350 to get so hot?
Can i replace with tip 41 and tip42?
And which resistor is responsible for increasing the gain?
I set up the pcb for this post
100W Ultimate Fidelity Amplifier

Hi fabiomaster,
For increasing gain , refer this post.
100W Ultimate Fidelity Amplifier
For bias, referring the same schematic as above post, delta V measurement should be done from emitter of Q10 to emitter of Q11. Normally class AB amp it should be 25mV to 30mV.. So bias current is ~ 50 to 60mA or there about.

I do not know if MJE 340/350 getting too hot to touch might indicate problem in AX 11. .

if bias and offset are correct and you are getting sound output with test speaker, try a small heatsink for them (mje340/350). if temperature is ok, then you are good to go.