MOSFET Amplifier IRFP240/IRFP9240 - Page 53

nazirdigi · 20th March 2012, 10:31 AM

OK sir

kimberlator · 24th April 2012, 04:02 AM

Quote:

Originally Posted by apexaudio

Simple Full Complementary Simetry +/-80V. Voltage amplifier/driver biased with 30mA. This driver circuit stabilized BIAS in output stage. Exelent stability without oscilation, hum and noise, sound great.
RMS Power: 240W 8ohm, 350W 4ohm

Hi, do you actually make this pcb's?
And if so, would you sale them?

harizhent · 24th April 2012, 09:58 AM

Hi,
I have few questions about this design:
If I want more or less power i just need to add or remove amplification degree(i'm not sure how it is really named in English.. ) of mosfets?
How can I calculate needed power supply voltage for this amplifier if I remove or add another pair of mosfets?

AndrewT · 24th April 2012, 03:34 PM

Hari,
simply asking the question tells me you are not ready to modify an amplifier design.
Leave it alone until you have learned how to determine what needs modifying.

harizhent · 24th April 2012, 04:34 PM

Mhm, i'm not ready, so that is why i'm asking

I have allways been taking hardest way to learn...

44250 · 24th April 2012, 07:09 PM

This is what i have done up till now...

44250 · 24th April 2012, 07:13 PM

It is going to be something like this:

apexaudio · 24th April 2012, 07:35 PM

Quote:

Originally Posted by 44250

It is going to be something like this:

Nice work, that will be valuable amplifier, thanks for shareing.
Regards

44250 · 24th April 2012, 10:02 PM

Quote:

Originally Posted by apexaudio

Nice work, that will be valuable amplifier, thanks for shareing.
Regards

Heh,THANK YOU for sharing all this with us!

One thing must be considered,and that is if anyone uses *2N5401/5501 MJE340/350* than must be careful with pin-placements because the pcb was made for *2SA-2SC* combination with BC639/640. BC327-337 that replaces BC639-640 also has a different pin-placement,so be aware...

Some pictures from tonight:

kimberlator · 25th April 2012, 03:37 AM

Quote:

Originally Posted by apexaudio

Circuit diagram work good even in PA amplifiers. I made over 120 PCBs in last 5 years. Beginer with basic expirience in DIY can easy made this amp. Usefull not only for hobby.

So, do you have this for sale? fully populated or bare pcb's?

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20th March 2012, 10:31 AM	#521
nazirdigi diyAudio Member Join Date: Oct 2009	OK sir

24th April 2012, 09:58 AM	#523
harizhent diyAudio Member Join Date: Mar 2012	Hi, I have few questions about this design: If I want more or less power i just need to add or remove amplification degree(i'm not sure how it is really named in English.. ) of mosfets? How can I calculate needed power supply voltage for this amplifier if I remove or add another pair of mosfets?

24th April 2012, 03:34 PM	#524
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	Hari, simply asking the question tells me you are not ready to modify an amplifier design. Leave it alone until you have learned how to determine what needs modifying.

24th April 2012, 04:34 PM	#525
harizhent diyAudio Member Join Date: Mar 2012	Mhm, i'm not ready, so that is why i'm asking I have allways been taking hardest way to learn...