100W Ultimate Fidelity Amplifier

[Joel Wesseling]

Thank You, Itco!

Excellent Pics of A40. Thanks for the Schematic and all other details.

 

[yoosefheidari]

is A40 better than SR200 in terms of sound quality and noise level ?

 

[Itco]

Thanks for your reply.
Not using altium here, sounds like under eagle 'tStop' and 'bStop' are the way to go. Will try when I have to make a pcb again. Ordered last ones in JLCPCB too.
Outputs from eagle users would be nice to hear.

Previously i used Eagle CadSoft for PCBs. And yes you can use Stop and tStop layers to open the solder mask. When you order the PCBs don't forget to include gerbers for these layers. Also to be sure it is all correct, after generate the gerbers you can check them with some gerber veawer.

 

[thimios]

Ok, can you post the modified gerbers here?
If not, i think that is an effort for Hicoco

 

[Rumen]

And my APEX A40. With modificated ground under the boards and transistors type in VAS.

 

[invaderzim]

I'm trying to set the bias on my board but the most it will move is from 1.2mv to 1.3

 

[tozeyana]

Apex AX14 version Prasi Build

Somehow mine has 10mV and idle current via Q14 and output at 0.10~0.15mA with no setting.
its working ok and nothing is getting hot, should i get worried? been up for the past 20min

 

[karachay]

dont use it witouth protection.

 

[SoundsGreat]

Hey Guys, Been a while since I posted here but Am regularly checking all the updates.

Has anyone done a AX14P in the new layout ( output at opposite ends)? If yes can you please share the sprint layout of the same

 

[Hicoco]

P30ZF power up

Left channel on the test bench

 

[r_jik45]

@ Hicoco,
Are you using a usb-oscilloscope?
Looking for a good cheap one

 

[invaderzim]

Somehow mine has 10mV and idle current via Q14 and output at 0.10~0.15mA with no setting.
its working ok and nothing is getting hot, should i get worried? been up for the past 20min

That is better than mine. It sounds terrible, really distorted and low volume level.

The other channel I did works fine. I still can't find anything that is causing this one to register so low and not respond to adjustment more.

 

[Hicoco]

@ Hicoco,
Are you using a usb-oscilloscope?
Looking for a good cheap one

I use RSPro with USB hardcopy..almost done with the Right channel Test, i will post more pic.

 

[kozard]

Is this a picture and schematic of the 100W Ultimate Fidelity Amplifier which started this thread? Is it a good kit to try?

 

[smartx21]

No! Only same name.

 

[kandimba]

No, this thread started with BJT power amplifier, AX14 filosofy.

Regards

 

[r_jik45]

I use RSPro with USB hardcopy...

Thanks for the info. The usb symbol mislead me

 

[apexaudio]

Is this a picture and schematic of the 100W Ultimate Fidelity Amplifier which started this thread? Is it a good kit to try?

This is clone of APEX FH9.

 

[kozard]

This is clone of APEX FH9.

Is this a clone that you are "ok" with? Would you recommend that an interested hobbyist try this kit to compare with their other projects (such as MX50X2 and MA9S2)?

Due to the very high interest in this thread I thought this "100W Ultimate Fidelity Amplifier" might be a suitable next project for me to explore.



Or do you recommend a different starting point instead of this kit? (Maybe it is or is not a good clone, and/or maybe you have another design that you would suggest instead?)

 

[karachay]

That is better than mine. It sounds terrible, really distorted and low volume level.

The other channel I did works fine. I still can't find anything that is causing this one to register so low and not respond to adjustment more.

check VBE voltages. start from first transistor on your sch.