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23rd November 2005, 11:30 AM
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#1 |
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diyAudio Member
Join Date: Aug 2003
Location: Koper
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FET experts advice needed
Hello !
Could someone give me an advice on this HexFet based power amp Schematic. I'm thinking to build it - but with different output fets IRFP240 and IRFP9240 and with +/- 50V DC on the power supply. I'm not shure if this project is worth to build (I'm not expert in fet based amps) so I ask You experts for an opinion. Thanks for all info
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Some are born with more and some born with less so don't take for granted the life we've been blessed it's hard to understand thet we're only a guest and each one of us shall be put to life's test. |
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23rd November 2005, 12:17 PM
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#2 |
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Did it Himself
diyAudio Member
Join Date: Nov 2003
Location: Gloucestershire, England, UK
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The FETs should swap fine, but 50V might be a bit too high with a 4 ohm load.
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www.readresearch.co.uk my website for UK diy audio people - designs, PCBs, kits and more |
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23rd November 2005, 05:30 PM
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#3 |
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diyAudio Member
Join Date: Aug 2003
Location: Koper
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The load will be 8 ohm. How many watts can I espect on 8 ohm load with +/- 50V DC with this setup ?
Cheers
__________________
Some are born with more and some born with less so don't take for granted the life we've been blessed it's hard to understand thet we're only a guest and each one of us shall be put to life's test. |
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23rd November 2005, 05:39 PM
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#4 |
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diyAudio Member
Join Date: Apr 2002
Location: Prague, Kitakyushu, Fukuoka
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Even for 8 Ohm load you have to take into account impedance dips to some 5 Ohm (I assume you are not going to listen to the sound of pure resistor).
What is worse, the speaker is a reactive load with considerable impedance phase shifts. So peak current and peak power is the issue. +/- 50V is really a lot for just one pair of output devices. |
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24th November 2005, 01:52 AM
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#5 |
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Account Disabled
Join Date: Aug 2004
Location: Earth
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Hi bostjancek,
You should look at the other thread regarding the instability with this Giesbert design - Need help with Giesberts HEXFET AMP Or you could look to my Simple Killer amp - Simple Killer Amp! or check on my website for the simple, elegant GB150D. Mine is stable. http://members.dodo.com.au/~gregball/guru_004.htm Cheers, Greg |
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