100W Ultimate Fidelity Amplifier

[DJDestiny]

What company? I still not understand...

FUTUREKIT.COM :: HIGH QUALITY ELECTRONIC KITS - HOME
They merely modified it slightly , setting the bias permanent .

 

[comasus]

Variable Resistors 22k and 470 ohm.

Yes sir what are those variable resistors used for?

 

[apexaudio]

Yes sir what are those variable resistors used for?

Off Topic.

 

[comasus]

Off Topic.

Sir

I mean what are they in the given circuit

Are they for bias adjustment?

I have posted this hoping that you will help me in knowing them

thank you

 

[samlo]

Hi apex, thanks for reply. i replaced bias resistor R16 (1k) with 1.8k, R 17 (220) with
470 ohm and analysed AX14 circuit with spice. now all nodes showing proper Voltages
and currents. expecting your technical explanation. thanks again.

 

[apexaudio]

Hi apex, thanks for reply. i replaced bias resistor R16 (1k) with 1.8k, R 17 (220) with
470 ohm and analysed AX14 circuit with spice. now all nodes showing proper Voltages
and currents. expecting your technical explanation. thanks again.

No need to change value of R16 and R17, just change value of variable resistor P1 (0-1k) to get about 2,2V on Vbe multiplayer Q10 (BD139),
Regards

 

[Macleod]

AX-14 Schematic and PCB

Hello Mile,

What is the purpose of R2 between the two base of IPS? I see it sometimes but never investigated that.

Regards

Laurent

 

[apexaudio]

Hello Mile,

What is the purpose of R2 between the two base of IPS? I see it sometimes but never investigated that.

Regards

Laurent

R2 (22k) is not connect between two bases, it's connect to GND in series with R8 (560R),
Regards

 

[engel dela pena]

sir mile,
do you have pcb design for this NX14?
please share

 

[apexaudio]

sir mile,
do you have pcb design for this NX14?
please share

Yes, there are two versions of NX14 pcbs in this thread, I suggest second version.

 

[engel dela pena]

sir mile,
i'm very sorry,i should review first the thread before asking,but thank you anyway,and is 4 pair possible with this N14?

 

[apexaudio]

sir mile,
i'm very sorry,i should review first the thread before asking,but thank you anyway,and is 4 pair possible with this N14?

No need to use more than single pair of mosfets (paralleling problems)

 

[engel dela pena]

sir miles,
are you reffering to mosfets self oscillating problem?

 

[apexaudio]

sir miles,
are you reffering to mosfets self oscillating problem?

This is HI-Fi amp for home use, if you want more powerful mosfet amplifier go to: http://www.diyaudio.com/forums/solid-state/162043-mosfet-amplifier-irfp240-irfp9240-43.html
Regards

 

[Sawomatang]

Thank's mr.mile

 

[apexaudio]

Thank's mr.mile

Be welcome

 

[engel dela pena]

sir mile,
irf240/9240 is good powerful amp,
please share powerful n-cnannel fet .
regards.

 

[vorezky04]

Mr. mile, can you share schematic and layout of B250???

 

[apexaudio]

sir mile,
irf240/9240 is good powerful amp,
please share powerful n-cnannel fet .
regards.

I not made any powerfull amp with only n-channel fets.
Regards

 

[apexaudio]

Mr. mile, can you share schematic and layout of B250???

Use B500 schematic and pcb for B250.