100W Ultimate Fidelity Amplifier

[44250]

Hi,i assemble AX14P cuircuit but it is not start good and on the relay ther not goes suplly.so relay become not on,why and 15 volt supply comes on speaker

connect input GND to a psu star GND.

 

[aliskamjad]

My pcb is ready to populate, expecting to complete it within this sunday.

Completed my First Apex Amplifier. I'm facing some problems that are:
1). I'm getting 0V across 0.33E resistor ( no variation with preset adjustment)
2). Sound is somewhat like mid is high causing bass to be low.

please help me to fix these problems, as i read lot about SR150's sound performance, but my SR150 is not sounding that much as expected.

 

[c08bm]

A2

Not tested, please check for errors.
Sprint layout attached.

 

[aliskamjad]

SR-150

My first Apex amplifier SR-150.
Facing some problems need a fix.

 

[apexaudio]

Not tested, please check for errors.
Sprint layout attached.

Nice work... you must add this jumper...
Regards

 

[ivanlukic]

Not tested, please check for errors.
Sprint layout attached.

Atenzione!

Sanken SAP transisitors (with 5 pins) are no longer produced, they are obsolete. It is better to design pcb with new STD03N and STD03P transistors (with 4 pins)!

 

[ivanlukic]

I make AX11 simulation and modified it.

Do you have pcb design for improved AX11?

This is my second pair of finished AX11. PCB design is by Willy!

 

[stocktrader200]

you must reverse the 2N5551 on pcb to match C B E legs on the board

 

[ivanlukic]

This is one of Willy's pcbs for AX11 but this one is for BC546 and BC639/BC640 and is used by many constructors. Absolutely tested and working!

 

[apexaudio]

Atenzione!

Sanken SAP transisitors (with 5 pins) are no longer produced, they are obsolete. It is better to design pcb with new STD03N and STD03P transistors (with 4 pins)!

Yes, and it is better to use OPA604 instead TL071.

 

[Rick G]

Your fuses are blown.

EDIT; Looks like the 10R resistor is blown on the + side also. I see you relabeled the pins of the transistors. You can't do that. E is E, C is C and B is B. All you did was spin the transistor.

OK. Replaced all fuses & blown MJ15003.Checked all other Transistors & resistors. See attached. NOW have 274MV on output. +side draws 67.8MV across 10R in Series & -side draws 87.6mv across 10R in series.

Did NOT relabel anything on Orig Sch.

 

[still4given]

Check the solder joint on the collector of the BC639. If you look at your schematic you will see that you have -40V on the collector yet +1 on the base of the BD140. Those should be connected and have the same voltage.

 

[bimo]

Do you have pcb design for improved AX11?

This is my second pair of finished AX11. PCB design is by Willy!

I did not make pcb layout for my AX11 modification. Not yet.
This is simple amplifier, I think everyone can make the pcb design. Just take care of where the feedback point taking...

 

[bimo]

I did not make pcb layout for my AX11 modification. Not yet.
This is simple amplifier, I think everyone can make the pcb design. Just take care of where the feedback point taking...

A gift from me 😉

 

[still4given]

Hi Bimo,
Can you explain the reasons for the modifications you made? I'm interested.

 

[bimo]

Hi Bimo,
Can you explain the reasons for the modifications you made? I'm interested.

I want to make it have high slew rate, then I change the compensation.
I like an amplifier that have high slew rate very much.

 

[UltimateX86]

100W with OP and 2 outputs... just for fun.

Hi,

Lateral Mosfet output is possible ?

thanks

 

[Rick G]

Terry,
Thank You. Problem was with the 330p cap. Reflowed & now is working. Still have -40mv on output. 35mV across the emitter resistors. Total input power is 174ma idle. How do i adj. the -40ma on output

Rick

 

[ivanlukic]

Rick,

-40mV on output is not dangerously high offset and it is not necessary to fix it.

 

[ivanlukic]

A gift from me 😉

Thanks!