Irf540/irf9540 Amplifiers Schematic Collection

[zox2003]

I want to start this tread.It will make easy for everyone to find WORKING amplifier schematic.

SO:

This is a place to post WORKING VERSION of amplifier made with IRF 540 and 9540 FET's.
You will guys help me and another people a lot.
Also you can post your opinions about that amp.
I know that there is probably a lot of schematics all around this forum,but let's put everything in one basket,

THANKS.

 

[Upupa Epops]

Something like this ? 60 W / 8 Ohm, 100 W / 4 Ohm, THD below 0.01 % 20 - 20 kHz, IMD 0.002 %, SNR more than 120 dB, SR 100 V / microsec. , 2 Hz - 300 kHz full output BW . Have you better ?

 

[mastertech]

That is a great idea zox2003

www.passdiy.com
www.audiosector.com
www.diyaudio.com
www.mastertech.com

 

[MikeB]

Solid state only, or also ClassD ? I am just working on one using
these fets...

 

[Upupa Epops]

We take all, Mike . Classical solution isn't still interesting for you ? What a pity, your circuit was good .

 

[MikeB]

We take all, Mike . Classical solution isn't still interesting for you ? What a pity, your circuit was good .

Oh, i am still interested in analog designs, they are much simpler to contruct...
I was curious, and needed to make a trip into switching amps,
now i know how "bad" my circuit was. Except the bass the ClassD fully
outperformed my other amps, with the trebles i am not sure...
Seems that a slewrate of 1400V/uS has some advantage ?

Mike

 

[Upupa Epops]

1400 V ? How is tact frequency ?

 

[MikeB]

Frequency is only 300khz, but all stages need to be able to follow rise/fall-time (~50ns,+/-36volts swing).
But we should move this discussion out of this thread, per mail ?

 

[Upupa Epops]

OK, send me something, thanks .

 

[zox2003]

OK Let's Start

OK guys where schematics are?

Let's do it...

UPOPA- Thanks for support.Have you build this one and how sounds.Any problems with amp.
What is about PART LIST?

 

[Upupa Epops]

I had build app. two hundred and fifty of these amps . Sound is extraordinary, thanks to here used error correction - I mean, that sound will be similar like Halcro amps ( which I don't listen yet ). At attach is parts list.

 

[zox2003]

???

UPUPA,

How much power can you get with pair of 540/9540's?What are rail voltages?

Thanks

 

[Upupa Epops]

I was using + / - 40 VDC and 200 VA transformer for each channel. Output power was 65 / 8 and 100 / 4. Safety value of voltage is 10 % below 50 V, i.e. 45 V ( safety value for mains voltage uprise - in Europe is tolerance of mains voltage - 10 / + 8 % of nominal volage, how is value in USA I don't know ). By + / - 45 V and little bit bigger transformer, you can get probably cca 80 - 85 / 8 and 120 - 130 / 4. This is max. safety output power from one pair of these mosfets.

 

[zox2003]

upupa question?

I have question for you:

In another Thread I asked question about two pairs of mosfet's.
What is better to use:
IRF540/9540 or
IRFP240/9240 ?

I received answer that P-channel (9XXX) is not good as N-ch MOSFET (more distorsion,rail voltage difference...).
What do you know about it?Any problems with this?


Thanks

 

[Upupa Epops]

For lower rail voltage are 540/9540 better, 'cos they have better Rdson and higher Idsmax. Any PCH fet have the same parametres as NCH ( in the same family ). Problem ? Do you mean, that I had build 250 pieces of problematic amps ?

 

[JBnl]

Here is also one

http://users.swing.be/edwinpaij/realisations.htm

 

[zox2003]

Q Current for your amp

UPUPA,

What shoul be quisc. current for pair of IRF540/9540?


Thanks

 

[Upupa Epops]

Quiscent current is set up 200 mA. Leave your thinking about A class - although this amp is AB, have extremly low distortion at low levels, lower than most of class A amps .

 

[zox2003]

WHAUUUU?

200ma-That is really high.
How hot amp gets on 100w/4ohm?
Is this only amp with 540/9540 that you recommend?

 

[Upupa Epops]

With heatsink 250*100*40 mm was any problems with cooling - remember that average music output power is much lower .