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DC Servo MOSFET Amplifier
DC Servo MOSFET Amplifier
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Old 24th August 2010, 06:23 AM   #81
macd is offline macd  South Africa
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Default RE Replacements for IRF240/IRF9240

Quote:
Originally Posted by apexaudio View Post
IRF640/IRF9640 or IRF540/IRF9540 (with +/-45V DC max rail voltage) can be used.
Hi Apex,

I found IRF540/IRF9540 fets. I have a +/-49V DC transformer with me. Can I use this transformer or is +/-45V the absolute max voltage for this amp with this fets. If so I will then continue my search for the proper fets. Any mods I can do to use this fets with my voltage?

Regards,
Macd
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Old 24th August 2010, 07:39 AM   #82
apexaudio is offline apexaudio  Serbia
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Quote:
Originally Posted by macd View Post
Hi Apex,

I found IRF540/IRF9540 fets. I have a +/-49V DC transformer with me. Can I use this transformer or is +/-45V the absolute max voltage for this amp with this fets. If so I will then continue my search for the proper fets. Any mods I can do to use this fets with my voltage?

Regards,
Macd
What is AC voltage on transformer? You can use IRF540/IRF9540 with +/-49V DC rail voltage for usual home listening.
Regards
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Old 24th August 2010, 09:28 AM   #83
macd is offline macd  South Africa
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Default Replacements for IRF240/IRF9240

Quote:
Originally Posted by apexaudio View Post
What is AC voltage on transformer? You can use IRF540/IRF9540 with +/-49V DC rail voltage for usual home listening.
Regards
The AC voltage of my transformer is 35-0-35 Volts. After rectifier I get +/-49V. Is this okey? If I use force cooling like a fan, Is it okey......

Regards,
Macd
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Old 24th August 2010, 09:41 AM   #84
AndrewT is offline AndrewT  Scotland
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+-49Vdc from a 35+35Vac transformer seems a bit low.

Is the transformer 230:35+35Vac?
Is your supply 220Vac when you measure the rectified DC voltage?
Are you using a single bridge rectifier with a CT transformer, or are you using dual bridge rectifiers with dual secondaries?
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regards Andrew T.
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Old 24th August 2010, 09:55 AM   #85
macd is offline macd  South Africa
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Default RE Replacements for IRF240/IRF9240

Quote:
Originally Posted by AndrewT View Post
+-49Vdc from a 35+35Vac transformer seems a bit low.

Is the transformer 230:35+35Vac?
Is your supply 220Vac when you measure the rectified DC voltage?
Are you using a single bridge rectifier with a CT transformer, or are you using dual bridge rectifiers with dual secondaries?
Yes, the transformer is rated at 220:35+35Vac. I am using a single bridge rectifier with my transformer. Only one secondary. I have measured my DC volts on output of transformer. +/-49V DC.

Macd
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Old 24th August 2010, 10:15 AM   #86
apexaudio is offline apexaudio  Serbia
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Quote:
Originally Posted by macd View Post
The AC voltage of my transformer is 35-0-35 Volts. After rectifier I get +/-49V. Is this okey? If I use force cooling like a fan, Is it okey......

Regards,
Macd
Cooling is not problem, 100V drain to source voltage of IRF540/IRF9540 can be.
Regards
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Old 3rd September 2010, 09:15 PM   #87
apexaudio is offline apexaudio  Serbia
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Stcboy's F100
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Old 3rd September 2010, 10:18 PM   #88
apexaudio is offline apexaudio  Serbia
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Default Class H

Step driver from H200 can be add to any amp for work in class H.
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Old 4th September 2010, 10:25 PM   #89
apexaudio is offline apexaudio  Serbia
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Step driver from H200 can be add to any amp for work in class H.
IRF3205/IRF4905 in TO220 case are the best choice for this class H step driver.
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Old 14th September 2010, 07:19 PM   #90
apexaudio is offline apexaudio  Serbia
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Forum member do simulation of new DC Servo Mosfet Amp, after correct some mistakes on schematic. I must design PCB for this Amp or someone else do that
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