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MOSFET Amplifier IRFP240/IRFP9240
MOSFET Amplifier IRFP240/IRFP9240
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Old 21st April 2018, 01:27 PM   #1061
apexaudio is offline apexaudio  Serbia
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Quote:
Originally Posted by makus ele View Post
i need a powerful +-113 v Amplifier pcb i will use 11 pairs of 2sc5200
1000W Simple PA Amplifier
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Old 21st April 2018, 07:48 PM   #1062
makus ele is offline makus ele
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Originally Posted by apexaudio View Post
This PSU was used in time when I building this mosfet amplifier. There is PSU, DC and overload cut-out protect for each channel and soft-start for toroidal transformer. This circuit can be used with any amplifier.


how does overload cut-out protect works
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Old 22nd April 2018, 07:05 AM   #1063
makus ele is offline makus ele
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thanks for your help apexaudio
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Old 24th April 2018, 06:11 PM   #1064
makus ele is offline makus ele
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i need a speaker short-circuit protection
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Old 23rd July 2018, 01:33 AM   #1065
silvestre101 is offline silvestre101
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where does the protect go and what diode goes in the clip ciruit
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Old 25th July 2018, 08:43 AM   #1066
apexaudio is offline apexaudio  Serbia
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HV12
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Old 25th July 2018, 08:55 AM   #1067
apexaudio is offline apexaudio  Serbia
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HV12 schematic is in post #1023
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Old 11th October 2018, 10:05 AM   #1068
mprivitera1 is offline mprivitera1  Italy
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Hello guys,remember me the post where I explain BIAS regulation?Thank you
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Old 11th October 2018, 07:02 PM   #1069
steveu is offline steveu  United States
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Smile thermal compensation

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Originally Posted by event horizon View Post
Ok, im not doubting you Q9 & 10 are effectively emitter followers though, if you mount them on the same heatsink as the output transistors surely they can't compensate for quiescent on the output stage?

Perhaps i'm having a stupid attack due to a few beers My apologies if this is so...
Actually , the thermal ~stability comes from D1,2,3,4, because the cross-over bias is dependent on VAS current which is a function of the diff-amp current, and one diode drop is across the current source(s) emitter resistor.

I'm not fond of completely symmetric front ends because there is so much bias dependency from one stage to the next and requires VAS emitter resistors. And according to some simulations I've done, there is no huge advantage in distortion that you would expect. And we know that symmetry cancels even order harmonics, which are "pleasant sounding", vs odd harmonics which are not. Harley Davidson sell a lot of motorbikes because the engine "defect" is very musical.

Years ago, Sinclair modules used a single resistor for cross-over bias and depended on the thermal compensation from the VAS current source, and that was a BJT circuit. Now, they blew up a lot because the output transistors were tiny and the system grounding critical, prone to oscillations. But they sounded great when they worked. That was my "previous life".
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