MOSFET Amplifier IRFP240/IRFP9240

[nigelwright7557]

With +/-33V single pair of output FETs is enough, you can see circuit in post #239, and wireing in post #145. Bias adjust to get about 20mV on 0R47/5W resistor. Power will be about 50W on 8R load with +/-33V DC. You can use this amp for any aplication, and I think beginer can build it with my help.
Regards

You have to take into consideration transients when deciding on a power supply.

On my first self design MOSFET amp I used +/-40VDC and was surprised how quickly the transients got clipped.
I now never use a supply less than +/-60VDC.
I do play quite loud so perhaps you dont need such a high voltage.

 

[apexaudio]

You have to take into consideration transients when deciding on a power supply.

On my first self design MOSFET amp I used +/-40VDC and was surprised how quickly the transients got clipped.
I now never use a supply less than +/-60VDC.
I do play quite loud so perhaps you dont need such a high voltage.

I suggest +/-75V. Amplifier with +/-33V can be realise with LM3886 or TDA7294.
Regards

 

[apexaudio]

Hv350.2

HV350 with cut out protect

 

[apexaudio]

VI limiter, and cut out protect from HV350.2 can be add on all my amps.

 

[mihailo]

Apex, can you look this chematics.
If it is ok, I would draw pcb for this because I have loot of IRFP250N fets.

 

[apexaudio]

Apex, can you look this chematics.
If it is ok, I would draw pcb for this because I have loot of IRFP250N fets.

Better buy same number of IRFP9240 and build HV350,
Regards

 

[najjachi]

Hi apex, do you have PCB of HV350.2 with cut out protection?

 

[apexaudio]

Hi apex, do you have PCB of HV350.2 with cut out protection?

Regards

 

[najjachi]

Thanks, but i was mean the other PCB so how i'll be able to print and build the amplifier

 

[apexaudio]

Hv350.2 pcb

PCB size: 200x50mm

 

[najjachi]

thank you very much

 

[mathez]

hi apex,.,may i use irfp250n for final TR?in this amp

 

[apexaudio]

hi apex,.,may i use irfp250n for final TR?in this amp

This amp use fully complementary output stage with P/N MOSFETs, you can find amp with QUASI NMOS output stage in thread (post #197):
http://www.diyaudio.com/forums/solid-state/164093-100w-ultimate-fidelity-amplifier-20.html
Regards

 

[mathez]

okey thanks

 

[mathez]

do you mean irfp250n can be use for AX14?

 

[apexaudio]

do you mean irfp250n can be use for AX14?

For NX14 not for AX14,
Regards

 

[stcboy]

PSU for DIY with soft-start and DC protect. Transformer 1kVA sec: 2x55V 8A + 24V 1A.
PCB size: 200x75mm

Mr.Mile,
Can you please post the schematic of This psu with soft start /dc protect
as there is a missing label ( presumed capacitor but no specified value)
in the landscape shown at post #122.

Regards,

 

[mihailo]

Apex
Your PSU pcb in post #122 is very interesting.
Can it be used for B500?
Can you post schematics?
Regards

 

[apexaudio]

Apex
Your PSU pcb in post #122 is very interesting.
Can it be used for B500?
Can you post schematics?
Regards

Yes, but PRO signal from B500 will not activate cut out speakers on this protect. Anti-click and DC protection will work. PSU and Soft-Start will work with any amp. I try to find schematics.
Regards

 

[mihailo]

Thanks.
I need schematics because I don't know where to connect output,voltage,...
it's not marked on pcb.
Regards