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Old 22nd August 2005, 01:57 PM   #1
m0nty is offline m0nty  Italy
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Default szekeres amp - irf510 equivalent

i'm building the headphone amp at this link:
http://headwize.com/projects/showfil...szeke1_prj.htm
i tried to get the irf510 or 513, but the seller has none.
he gave me irf540 instead, will they work?
i'm lookink at the datasheets, but i'm quite a newbie so I'm not sure

another question:
there's also a version with a lm317 regulator instead of the source resistance.
what sounds better?

thanks
Nicola
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Old 22nd August 2005, 10:15 PM   #2
Nisbeth is offline Nisbeth  Denmark
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The irf540 should work, but it has much higher gate capacitance, so yuou could get some treble roll-off. See if you can find the IRF610 instead.

IMO, the Szekeres-version with the LM317 current source is better than the "old" resistor loaded version.


/U.
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Old 22nd August 2005, 10:45 PM   #3
vit is offline vit  Sweden
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IRF610 would probably work
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Old 23rd August 2005, 11:51 AM   #4
m0nty is offline m0nty  Italy
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thanks for the replies

I posted the question also because I was looking at the datasheet:
let's say I want Id = 250 mA (as suggested...)
the output charateristics graphic (at 25) starts from 1A, and, with Vgs = 4.5, for Vds > 1, Id is about 10A !!!
Am I reading the graphics wrong??

the datasheet is here:
http://www.irf.com/product-info/data...ta/irf540n.pdf

thanks
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Old 23rd August 2005, 12:03 PM   #5
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No you are reading it right. The gate voltage will just be maybe 2-3 volts for the current you need.
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Old 23rd August 2005, 12:25 PM   #6
m0nty is offline m0nty  Italy
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thank you
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Old 23rd August 2005, 07:08 PM   #7
Bricolo is offline Bricolo  France
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I used a Toshiba 2SK216, and it worked good
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Old 24th August 2005, 07:31 AM   #8
m0nty is offline m0nty  Italy
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looking at the datasheet, the 2SK216 should be perfect, but I can't find it in the catalog
what about the irf 710? it has lower power than 510, max current is 2A
I think it could be a good substitute to the irf510:
irf510 has 135pf capacitance, and at 300mA vgs is between 4V and 5V (but you can't really tell from the graph)
irf710 has 135pf capacitance, at 300mA is around 4.2V

however rds(on) for 710 is about 6 times higher than 510, does that make diference?
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