100W Ultimate Fidelity Amplifier

[RSK]

Originally Posted by apexaudio

There is IRF450 and it can be used also. MOSFETs are from IR not from SAMSUNG.
Regards

Yeah I was looking on the net for datasheet and samsung comes out??
But anyway I will try this NX14.

Raj.

[radio]

Hello Mickey!
I want to develop this amplifier Apex AX-14. I want to ask one question:
What changes should I do when I have the amplifier power of Us = + /-38V and the output thereof I want to turn the speakers with an impedance of 4 ohms??
Thank you in advance!

[apexaudio]

Originally Posted by radio

Hello Mickey!
I want to develop this amplifier Apex AX-14. I want to ask one question:
What changes should I do when I have the amplifier power of Us = + /-38V and the output thereof I want to turn the speakers with an impedance of 4 ohms??
Thank you in advance!

AX14 will work with +/-38V on 4ohms load without any changes.
Regards

[apexaudio]

Originally Posted by RSK

Yeah I was looking on the net for datasheet and samsung comes out??
But anyway I will try this NX14.

Raj.

I use for test 20cm wire from pcb to the outputs on heatsink, NX14 work without problem. MOSFETs in TO3 case will work, just use short wire for stability.
Regards

[macd]

Hi Apex,

Still no luck with my NX14. Looks like I have to assemble the second channel. Anyway I see there is a difference between the two boards(NX14 V1 and NX14V2). I see two 100R resistors on the layout but not on the schematic. See attachment. The 22uF 63V cap on the schematic is replaced with a 2.2uF cap on board.....is this okey......

Macd

[radio]

Hello ALL!!!
Audio Amplifier-comentar !!??
Tank youuu!

[apexaudio]

Originally Posted by macd

Hi Apex,

Still no luck with my NX14. Looks like I have to assemble the second channel. Anyway I see there is a difference between the two boards(NX14 V1 and NX14V2). I see two 100R resistors on the layout but not on the schematic. See attachment. The 22uF 63V cap on the schematic is replaced with a 2.2uF cap on board.....is this okey......

Macd

Two 100R resistor in series I use instead one 220R, 2,2uF is OK.
Do you measure voltages as I suggest?
Regards

[apexaudio]

Originally Posted by radio

Hello ALL!!!
Audio Amplifier-comentar !!??
Tank youuu!

'Nikko' coment sound of AX14 in local forum:
[es] - seme/pcb zastita pojacala i zvucnika
Regards

[adrianm]

Hi Mile, do you have a diy amp suitable for a 38-0-38 volts transformer? I prefer for a bipolar output stage.

[apexaudio]

Originally Posted by adrianm

Hi Mile, do you have a diy amp suitable for a 38-0-38 volts transformer? I prefer for a bipolar output stage.

AX14 will work with +/-56V DC rail voltage.