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MOSFET Amplifier IRFP240/IRFP9240
MOSFET Amplifier IRFP240/IRFP9240
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Old 17th June 2010, 08:08 PM   #251
Federmann is offline Federmann  Czech Republic
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Quote:
Originally Posted by apexaudio View Post
Simple Full Complementary Simetry +/-80V. Voltage amplifier/driver biased with 30mA. This driver circuit stabilized BIAS in output stage. Exelent stability without oscilation, hum and noise, sound great.
RMS Power: 240W 8ohm, 350W 4ohm

Very low efficiency. My amp can in voltage 80V, output 700W/4Ω
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Old 17th June 2010, 11:11 PM   #252
apexaudio is offline apexaudio  Serbia
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Quote:
Originally Posted by Tube Pro View Post
Hi Mile,

Can I substitute 2SK1058 & 2SJ162 for those outputs?
TIA,
>Joel
Philippines
No this amp is design for IRFPs,
Regards
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Old 18th June 2010, 01:58 PM   #253
apexaudio is offline apexaudio  Serbia
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Default Hv250

I made version of this amplifier with OP amp in front. The MOSFETs used are IRFP9240 (P) and IRFP240 (N). They are assembled in a common source configuration so they can be completely saturated. Good sound, but audiophiles don't like OP amp in front, I can't change what people like or not, no metter what is the best.
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Old 18th June 2010, 02:16 PM   #254
apexaudio is offline apexaudio  Serbia
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This amp on picture work some time with fan cooling
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Old 19th June 2010, 11:07 AM   #255
apexaudio is offline apexaudio  Serbia
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Quote:
Originally Posted by Federmann View Post
Very low efficiency. My amp can in voltage 80V, output 700W/4Ω
HV350 is general purpose amp, efficiency is not important, just sound, but with HV250 you have efficiency (maximum power from rail voltage for class AB amp),
Regards
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Old 19th June 2010, 02:09 PM   #256
dudaindc is offline dudaindc  United States
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Quote:
Originally Posted by apexaudio View Post
I made version of this amplifier with OP amp in front. The MOSFETs used are IRFP9240 (P) and IRFP240 (N). They are assembled in a common source configuration so they can be completely saturated. Good sound, but audiophiles don't like OP amp in front, I can't change what people like or not, no metter what is the best.
Hello Mile
Do you mind posting the schematics for the OP based version?
Thanks!
__________________
"All measurements are wrong! Thus, measurement is the art of handling errors."
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Old 19th June 2010, 08:33 PM   #257
apexaudio is offline apexaudio  Serbia
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Quote:
Originally Posted by dudaindc View Post
Hello Mile
Do you mind posting the schematics for the OP based version?
Thanks!
I have two OP based mosfet amplifier, and I will post both schematics,
Regards
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Old 20th June 2010, 02:19 PM   #258
apexaudio is offline apexaudio  Serbia
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Quote:
Originally Posted by dudaindc View Post
Hello Mile
Do you mind posting the schematics for the OP based version?
Thanks!
OP based amplifier useing OP in input stage, not for DC servo like this
DC Servo MOSFET Amplifier
Regards
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Old 24th June 2010, 07:19 PM   #259
udhay_cit is offline udhay_cit  India
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Hi, Sorry to start from the beginning. I want to try this HV350 amp. Sorry i don't have experience of MOSFET amplifier design. This is my first project. Are you recommend this amp for first project.?.. If you have interest Please help me to complete my first project.

lot of discussion are going behind the design. so please give me the final circuit and component value.

I finished my PCB design for this amp. I want to start this amp with low power first. I have some questions.
1. I have +33v/0/-33v supply. I want to start from this range. (24v/0/24v transformer)
2. What are the settings should i made before start with this supply range.
3. Is it necessary to connect 4+4 MOSFET for this low power setting.
4. I have 150W/8E woofer. Is it enough for testing.
5. what should be the bios value for this supply range and what are the procedure to set the bios. how to set the bios current.
6. May i use this amp for my subwoofer amplifier.
7. How to calculate the output power of an amplifier.

Thank you. I have lot of interest in this amp. I will post my hardware photograph with in two days. sorry for my English.....

Regards
Udhay
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Old 24th June 2010, 08:06 PM   #260
apexaudio is offline apexaudio  Serbia
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Quote:
Originally Posted by udhay_cit View Post
Hi, Sorry to start from the beginning. I want to try this HV350 amp. Sorry i don't have experience of MOSFET amplifier design. This is my first project. Are you recommend this amp for first project.?.. If you have interest Please help me to complete my first project.

lot of discussion are going behind the design. so please give me the final circuit and component value.

I finished my PCB design for this amp. I want to start this amp with low power first. I have some questions.
1. I have +33v/0/-33v supply. I want to start from this range. (24v/0/24v transformer)
2. What are the settings should i made before start with this supply range.
3. Is it necessary to connect 4+4 MOSFET for this low power setting.
4. I have 150W/8E woofer. Is it enough for testing.
5. what should be the bios value for this supply range and what are the procedure to set the bios. how to set the bios current.
6. May i use this amp for my subwoofer amplifier.
7. How to calculate the output power of an amplifier.

Thank you. I have lot of interest in this amp. I will post my hardware photograph with in two days. sorry for my English.....

Regards
Udhay
With +/-33V single pair of output FETs is enough, you can see circuit in post #239, and wireing in post #145. Bias adjust to get about 20mV on 0R47/5W resistor. Power will be about 50W on 8R load with +/-33V DC. You can use this amp for any aplication, and I think beginer can build it with my help.
Regards

Last edited by apexaudio; 24th June 2010 at 08:09 PM.
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