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Old 26th April 2012, 08:33 PM   #311
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Originally Posted by Idefixes View Post
As you are talking from Class D i just in soldering a IRS2092 Kit from LJM...No doubt that it will be compared to TSSA BIGBT HP.

Marc
If this one will sound better than TSSA BIGBT HP, I'll immediately stop any of mine DIY activities forever.
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Old 26th April 2012, 08:38 PM   #312
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ARFFF....then if it the case i have to shut up......I have honestly no doubt about that TSSA is high grade...IRS2092 is i not bad things that is fast done for a plce where there's no place....

Marc
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Old 26th April 2012, 09:05 PM   #313
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Originally Posted by Joachim Gerhard View Post
I build the circuit from post 1 and also added constant current sources, but floating depletion mosfets. The sound got much better. Less distortion and bigger soundstage.
In that case you probably omitted 1N4148 diodes.

Is it listenable now, can you actually enjoy in music presentation or is it just one of "can be done" projects?
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Old 26th April 2012, 09:16 PM   #314
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I kept the diodes and will try transdiodes.
I listen to it all the time. It already sounds much less grainy then many amps i tried.
It is sweet but has resolution and dynamics. I do not challenge it much anyway because i use it only over 80Hz on 95dB sensitive speakers i put in the nearfield. I have an active bass system.
4V peak at the speakers make my left ear distort.
Under this conditions it has tremedoes potential. I personally like to drive the speakers from the drains and not the sources. That makes the amp short circuit prove and i think to drive an ELS without zobel should work too. It has no on or off plopp. I like the simplicity. You are really onto something here LC. Well thought out.
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Old 27th April 2012, 12:44 AM   #315
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Quote:
Originally Posted by Joachim Gerhard View Post
I kept the diodes and will try transdiodes.
Very well, it should be even better without them, just be careful to start with minimum bias setting after removing diodes.

Quote:
Originally Posted by Joachim Gerhard View Post
It is sweet but has resolution and dynamics. I do not challenge it much anyway because i use it only over 80Hz on 95dB sensitive speakers i put in the nearfield. I have an active bass system.
4V peak at the speakers make my left ear distort.
Under this conditions it has tremedoes potential. I personally like to drive the speakers from the drains and not the sources. That makes the amp short circuit prove and i think to drive an ELS without zobel should work too. It has no on or off plopp. I like the simplicity. You are really onto something here LC. Well thought out.
Yes, being so simple it is quite surprising to give that much. Good and reliable topology with just the right spices, synergy between BJT and MOSFET, best of each, together as a couple.
I am so pleased you shared the experiences and joy with us, also as you can see latest course of events, guys will try to squeeze even more out of TSSA.

All the best to you Gerhard
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Old 27th April 2012, 12:54 AM   #316
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The input stage can be improved much, i do not think that it is just the synergy...
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Old 27th April 2012, 06:58 AM   #317
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Yesterday evening i made a comparison of mosfet versus NJW1302G/3281G with MJF15030/15031 in darlington configuration with an emitter resistor of 0.22R

idle current is 1.8Amp.

In the simulation the THD for the exicons is 0.014% at 2.8Vp into 8R
for the darlington it is 0.004% at 2.8Vp into 8R

The thing is, they are easier to get, and cost 2/3 of the exicons.

At 1.8A and +/-32VDC we will dissipate 57Watt in each output device.

In comparison the exicons can handle 125Watt and the NJW's 200Watt.

With and heatsink of 0.4W/K the heatsink temperature will rise with 45.6K.

With 57Watt in the exicons it will rise to 102.6K leaving only 47Kelvin to the roomtemperature.

With the NJW you will have 35.625K leaving 68Kelvin to the room temperature.

I do not think it is safe to use the exicons or other devices rated lower than 200W for +/-32VDC supply voltage.

There is a lot talking against mosfets here.

Let me know what you think.

- Sonny
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Old 27th April 2012, 07:07 AM   #318
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Nothing wrong with mosfets as long as you allow for much lower loop gain. And gates should be shaken, not stirred......

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Old 27th April 2012, 07:10 AM   #319
sonnya is offline sonnya  Denmark
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ha ha ha ha
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Old 27th April 2012, 07:13 AM   #320
sonnya is offline sonnya  Denmark
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Not that they don't work for me.

I am just a bit concerned if we go for +/-32VDC ... +/-24VDC would be a lot safer.
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