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DC Servo MOSFET Amplifier
DC Servo MOSFET Amplifier
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Old 7th July 2010, 06:36 PM   #71
apexaudio is offline apexaudio  Serbia
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This amp work near the sea, there is much oxidate pins, dust and smoke, becouse of that I don't like trimpots.
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Old 27th July 2010, 02:03 PM   #72
apexaudio is offline apexaudio  Serbia
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2SK1529 and 2SJ200 can be used for this amplifier.
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Old 8th August 2010, 03:07 PM   #73
apexaudio is offline apexaudio  Serbia
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Default H200

This will be best version, cascode input, class H output with BJT drivers. High efficiency and high dinamic range (70v-35v-0-35v-70v) good for active speakers and subwoofers.
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Last edited by apexaudio; 8th August 2010 at 03:27 PM.
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Old 8th August 2010, 04:04 PM   #74
HMKD is offline HMKD  China
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R20 should be connected on the C12 makes sense, in the R19 is a mistake.
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Old 8th August 2010, 04:36 PM   #75
apexaudio is offline apexaudio  Serbia
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Quote:
Originally Posted by HMKD View Post
R20 should be connected on the C12 makes sense, in the R19 is a mistake.
This amp is based on F100 amp, see post #60, and there is no mistake.
Regards

Last edited by apexaudio; 8th August 2010 at 04:38 PM.
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Old 8th August 2010, 04:56 PM   #76
HMKD is offline HMKD  China
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Quote:
Originally Posted by apexaudio View Post
This amp is based on F100 amp, see post #60, and there is no mistake.
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C6, C8, C12 is superfluous and should be removed. If you think there is C8, C12 would be better, it is because of your Q4, Q5 current is too small, the level current to 10mA we go. Although you use for a long time, but this is unreasonable. I will not English, it is the Google translation, hoping to understand some.
Sincerely,
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Old 8th August 2010, 05:57 PM   #77
apexaudio is offline apexaudio  Serbia
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English is also my problem, but I understand you basicly. I use OP amp for auto adjust DC offset, and I keep C6 for safety (amp was use for PA at the first time, before 20years ago). I use 2SK135/2SJ50 in first version, and BF420/BF421 in VAS run with 3mA (0,2W disipation). You are right 10mA will be better, but BF420/BF421 must be replaced, and VAS transistor with 0,7W must have heatsink. I have MOSFET amp use 4xIRFP240/IRFP9240 with CFP VAS run at 30mA (VAS transistor on main heatsink), and run without EF drivers. As I use F100 for long time without problems I want to redesign basic circuit up to Hi-Fi level.
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Last edited by apexaudio; 8th August 2010 at 05:59 PM.
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Old 20th August 2010, 07:50 AM   #78
macd is offline macd  South Africa
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Default Replacements for IRF240/IRF9240

Hi Apex...

Any other replacements for IRFp240/IRF9240 except 2SK1529/2SJ200. My local supplier do not stock this Fets.....

Regards,
Macd
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Old 20th August 2010, 11:12 AM   #79
apexaudio is offline apexaudio  Serbia
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Quote:
Originally Posted by macd View Post
Hi Apex...

Any other replacements for IRFp240/IRF9240 except 2SK1529/2SJ200. My local supplier do not stock this Fets.....

Regards,
Macd
2SK405/2SJ115
Regards
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Old 21st August 2010, 08:20 PM   #80
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IRF640/IRF9640 or IRF540/IRF9540 (with +/-45V DC max rail voltage) can be used.
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