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Old 13th January 2017, 04:04 AM   #41
kartino is offline kartino  Indonesia
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Actually it is very easy game.
If you want over load protection at the situation, it is very simple, put thermal switch on the heatsink. Finish your problem, not my problem.

I only consider high possibility to happen, not all bad things. I know what you mean. But I don't consider that as that is no way someone to turn on the amp with no signal but have bad luck with output shorted. A double jeopardy.
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Old 13th January 2017, 07:10 AM   #42
stewin is offline stewin  Kenya
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hi pafi will this circut work comfortable with +/- 85vlts with a 2ohms load ?? outputs fets are irfb4227
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Old 13th January 2017, 10:54 AM   #43
Pafi is offline Pafi  Hungary
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Quote:
Originally Posted by stewin View Post
hi pafi will this circut work comfortable with +/- 85vlts with a 2ohms load ?? outputs fets are irfb4227
Hi,

85V and 2 ohms is possible for irfb4227, but no headroom, and there is no protection in this sch, and
- I can't find the gate driver PSU (not on schematic)
- bootstrap voltage is not hold correctly during positive overdrive. 3 ms max, it is dangerous.
- turn on is very slow. Good enough only for bass.
- clipping point is much lower for negative.
- Opto pairing is not indicated. :-(
- offset voltage setting is terrible.

should I continue checking it?
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Old 13th January 2017, 11:07 AM   #44
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The OT posts have been removed, and kartino has been given a 50-point infraction for being disrespectful to the other members.
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Old 13th January 2017, 01:06 PM   #45
kartino is offline kartino  Indonesia
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Quote:
Originally Posted by jazbo8 View Post
The OT posts have been removed, and kartino has been given a 50-point infraction for being disrespectful to the other members.
How about Pafi?
He started right?
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Old 13th January 2017, 01:08 PM   #46
kartino is offline kartino  Indonesia
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I am waiting a fairness
If not.... sorry I am done with this forum
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Old 13th January 2017, 01:15 PM   #47
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Originally Posted by kartino View Post
I am waiting a fairness
If not.... sorry I am done with this forum
nice
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Old 20th January 2017, 02:55 PM   #48
kartino is offline kartino  Indonesia
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Time's up!
Now you see why all the best people has left this class D forum!
Bye!
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Old 20th January 2017, 06:36 PM   #49
stewin is offline stewin  Kenya
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Quote:
Originally Posted by Pafi View Post
Hi,

85V and 2 ohms is possible for irfb4227, but no headroom, and there is no protection in this sch, and
- I can't find the gate driver PSU (not on schematic)
- bootstrap voltage is not hold correctly during positive overdrive. 3 ms max, it is dangerous.
- turn on is very slow. Good enough only for bass.
- clipping point is much lower for negative.
- Opto pairing is not indicated. :-(
- offset voltage setting is terrible.

should I continue checking it?

yes i would really appeciate that , because according to the author this circuit is compatible with many different fets
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Old 20th January 2017, 06:51 PM   #50
Pafi is offline Pafi  Hungary
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Quote:
Originally Posted by stewin View Post
yes i would really appeciate that , because according to the author this circuit is compatible with many different fets
What does it mean? It works the same terrible way with any of them?

Why do you care a dangerous and bad quality design with missing parts? The one in the first post of the topic ucd 25 watts to 1200 watts using 2 mosfets is much better!

Last edited by Pafi; 20th January 2017 at 06:55 PM.
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