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Old 15th March 2012, 07:57 AM   #1991
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mj777, can i replace IRF2807 with IRF540 in transistor type step driver of H900?
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Old 15th March 2012, 08:05 AM   #1992
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iiee...
IRF2807 used for max voltage 75vdc
IRF540 max voltage 100v
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Old 15th March 2012, 08:33 AM   #1993
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Default Transistor stepdiver

So there is no question to replace IRF2807? In our place, hard to find this trans.
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Old 15th March 2012, 12:05 PM   #1994
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Quote:
Originally Posted by iiee3602 View Post
So there is no question to replace IRF2807? In our place, hard to find this trans.
You can use 2pcs. IRF540 per rail instead IRF2807
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Old 16th March 2012, 12:19 AM   #1995
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Smile Transistor stepdiver

Thanks for that sir.
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Old 16th March 2012, 01:07 AM   #1996
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This 2 module of H900 with discrete step driver use 2 IRF540 per rail without any problem encountered
power supply used is +/- 110-55-0-55-110 volt


Click the image to open in full size.

Last edited by remle114; 16th March 2012 at 01:15 AM.
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Old 16th March 2012, 09:21 AM   #1997
AndrewT is online now AndrewT  Scotland
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irf540 are 100Vds devices.
How do you make them reliable with a +-110Vdc supply?
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Old 17th March 2012, 07:36 AM   #1998
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Quote:
Originally Posted by AndrewT View Post
irf540 are 100Vds devices.
How do you make them reliable with a +-110Vdc supply?
Hey AndrewT look at this original schematic of H900 and ask apex and others who build this amp why they use IRF540 at +/- 120-60-0-60-120 volt rail
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Old 17th March 2012, 07:43 AM   #1999
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irf540 while supplied from 120volt supply sits atop 60volts.....if Apex is confident with them, you can use them...
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Old 17th March 2012, 08:16 AM   #2000
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Quote:
Originally Posted by AndrewT View Post
irf540 are 100Vds devices.
How do you make them reliable with a +-110Vdc supply?
On IRF540 is only 55Vdc.
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