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Old 20th August 2010, 05:14 PM   #11
sekhar is offline sekhar  India
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Quote:
Originally Posted by ostripper View Post
Off by 2 .. project 117. Project 117

My point is that
This is a DREAM , give me your 50 pairs and it will not be indestructable. The layout , circuit topology , and device choices are more important than how many parts you throw at it. Then there is safety , I just spent 3 hours making a power supply that will do 100000uF , uses a 50A bridge , and can run at 100V and my greatest problem was not how many parts I could stuff it with .. but the spacing between traces for both the AC and DC to keep my safety margins to spec. Even added red and blue LED's to the rails for alert to VERY DEADLY VOLTAGE !!

My biggest amp(the ones the power supply above will power) are 250w/8r with 400+ watt peaks .... they can nearly throw every and any 15" or 18" woofer cone right out of the basket.(bounces right across the floor) That is why I have not built a 500w unit.

WHAT are you powering , and for what a 1000w analog amp costs, I can buy 5-10 500w class D amps. Another factor with many pairs is sound quality. A 2-4 pair BJT will sound better and be more reliable than a 15 pair monster.
If I had 4 inefficient 15" subwoofers rated at 300w - each , it would be cheaper, safer, and more reliable to build 4 - 250w amps than 1 big 1KW "arc welder" to power those 4 speakers.
OS
why do u say A bjt design is more reliable than mosfets ones I have never heard it . As i know mosfets r supposed to be more robust than BJTS in certain aspects ......


regards
sekhar
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Old 21st August 2010, 01:46 AM   #12
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Quote:
Originally Posted by sekhar View Post
why do u say A bjt design is more reliable than mosfets ones I have never heard it . As i know mosfets r supposed to be more robust than BJTS in certain aspects ......


regards
sekhar
IRFP240/924's are not made for class A/B audio , but will make for good subwoofer amps where quality does not matter. The IRF's are made for industrial switching apps. Lateral FET's , on the other hand , are made for audio and CAN be very musical in 500w+ amps.
Run your subs with IRF's and your better speakers on BJT's or Laterals , it the design that matters, not just the devices.
OS
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Old 21st August 2010, 02:11 AM   #13
sekhar is offline sekhar  India
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i know that irf is meant for switching purpose , but have tried them for hi-fi they r nt that bad . When the amp is supposed 2 pump out 1500w rms in 2e i dont think it has 2 be very high fi . Just a good performer with ultra high reliability is needed . When i say ultra high reliabity i mean virtually idiot proof.

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sekhar
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Old 21st August 2010, 02:26 AM   #14
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Originally Posted by sekhar View Post
i know that irf is meant for switching purpose , but have tried them for hi-fi they r nt that bad . When the amp is supposed 2 pump out 1500w rms in 2e i dont think it has 2 be very high fi . Just a good performer with ultra high reliability is needed . When i say ultra high reliabity i mean virtually idiot proof.

Regards
sekhar
Nothing is truly idiot proof , planet earth pumps out an idiot per second.
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Old 21st August 2010, 02:38 AM   #15
sekhar is offline sekhar  India
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Default true nothing is idiot proof

Quote:
Originally Posted by ostripper View Post
Nothing is truly idiot proof , planet earth pumps out an idiot per second.
just wanna make it the best .............. in wat ever manner possible



regards
sekhar
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Old 21st August 2010, 02:41 AM   #16
sekhar is offline sekhar  India
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come on guys ....... wat do say bout the schematics ?????????????
I see a potential here it can make a very good amp if all of u can contribute a little ....



regards
sekhar
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Old 21st August 2010, 11:25 AM   #17
AndrewT is offline AndrewT  Scotland
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Quote:
Originally Posted by ostripper View Post
Nothing is truly idiot proof , planet earth pumps out an idiot per second.
I think it is 0.286ipus

Sekar.
Get out your mosFET datasheet.
Look at the graph of Id vs Vds. It has Vgs plots on it showing the limiting current for a variety of maximum 20us currents that can pass through the FET at that combination of Vds and Vgs and Id.
Use those Vgs to determine the maximum current limit you want to set for each device and then select a diode + Zener to ensure Vgs never rises above your limiting 20us pulsed current.

Learn to read your datasheets.
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Last edited by AndrewT; 21st August 2010 at 11:29 AM.
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