MOSFET Amplifier IRFP240/IRFP9240

[Valenca]

Apex, very good circuit, but has many difficult parts to find, such as precision resistors ...

 

[apexaudio]

Apex, very good circuit, but has many difficult parts to find, such as precision resistors ...

No need to be that precision, 'crest' use smd resistors, but useing first close value MF resistors will be OK.
Regards

 

[apexaudio]

150W simple mosfet amp with IRFP240/9240

 

[jash2008]

150W simple mosfet amp with IRFP240/9240

Hello mile,
In respect of audio quality, how much difference is there between N10 and this amp.

Thanks

 

[apexaudio]

Hello mile,
In respect of audio quality, how much difference is there between N10 and this amp.

Thanks

This is 'Vintage' topology without CCS and with bootstrap in VAS. I share schematic only for example how simple mosfet amp circuit can be.
Regards

 

[f-recovery]

hi! apex can you pls.send me a copy of your vertex amplifier.thanks

 

[apexaudio]

hi! apex can you pls.send me a copy of your vertex amplifier.thanks

What is your expirience in DIY?
Regards

 

[h_a]

Hi apexaudio,

thanks for posting the link to the Crest schematics - great! Wasn't aware these are pubicly available.

Hannes

 

[daveinsingapore]

HV25 mosfet amp

MOSFET Amplifier 5XIRFP240/IRFP9240

Hey Miles what is the performance for the HV25 you show here...what power, what load, what power supply..?

 

[apexaudio]

Hey Miles what is the performance for the HV25 you show here...what power, what load, what power supply..?

Same performanse as HV23 just add one pair of outputs, with higher rail voltage power will increase up to 400W on 4R load, but I not suggest rail voltage higer than +/-80V.

 

[daveinsingapore]

HV24 specs

Same performanse as HV23 just add one pair of outputs, with higher rail voltage power will increase up to 400W on 4R load, but I not suggest rail voltage higer than +/-80V.

Thanks Miles...just interested to see how well this mosfet based amp performed...will stick with the B500 for now.

 

[daveinsingapore]

PSU-7

You can draw schematic from pcb layout, it's simple circuit.
Regards

Hey Miles, what is pc board size as drawn for the PSU-7?

 

[apexaudio]

Hey Miles, what is pc board size as drawn for the PSU-7?

PSU7 pcb size: 200X75mm

 

[apexaudio]

SF1

FET Buffer Preamp

 

[AndrewT]

Hi A,
why have you selected a high transconductance, low pinch off voltage jFET as the cascode device?

 

[apexaudio]

Hi A,
why have you selected a high transconductance, low pinch off voltage jFET as the cascode device?

Can you suggest me FETs?
Regards

 

[AndrewT]

2n5459/5462, or 2sk246/j103

 

[apexaudio]

2n5459/5462, or 2sk246/j103

Thanks

 

[engel dela pena]

sir apex,
what is the detail of this choke coil?
wire size,
core dia.
no.of turn.

 

[daveinsingapore]

PSU7 pcb size: 200X75mm

thank you miles...