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Old 17th June 2010, 05:03 PM   #11
HighTec is offline HighTec  Croatia
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Quote:
Originally Posted by sakis View Post
the heatsink has to be made of zorex, kryptonex, starson or any other material from the moon or jupiter to be able to absorve this type of heat ...
What about liquid nitrogen !?
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Old 17th June 2010, 05:15 PM   #12
Xoc1 is offline Xoc1  United Kingdom
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I see now that the FETs are angled outwards 'in the real world'!
The new layout shows the temperature compensation transistor for the bias, not central to the heatsink, is this not an issue?
Also I would like to add my vote to the addition of a proper driver stage after the VAS. With FET amps I have modified to include a driver stage, I have noted better stability when driving real loads.
Why is the capacitor C15, that is connected across the Feedback Resistor R17 trimmable?
Apart from that I like the distributed resevior capacitance on the output stage, & the separate PSU for the Driver Stage.
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Old 17th June 2010, 06:14 PM   #13
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Yes C15 is the capacitance trimmer. Only the total feedback, no local feedback. Bandwidth to 500kHz, up to 2MHz.
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Old 17th June 2010, 06:20 PM   #14
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Quote:
Originally Posted by Xoc1 View Post
I see now that the FETs are angled outwards 'in the real world'!
Second possibility FEFs may be Al prism 30x20mm, then the cooler.
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Old 18th June 2010, 05:13 PM   #15
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Federmann,

The symbols you used in the schematic of your amplifier for P-channel Fets is Wrong.....
Correct it.


I like the simplicity of your amplifier, at what current your VAS is running, since your driving a bunch of 10 Fet pairs directly.



Kanwar

Last edited by Workhorse; 18th June 2010 at 05:16 PM.
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Old 18th June 2010, 07:13 PM   #16
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Quote:
Originally Posted by Workhorse View Post
Federmann,

The symbols you used in the schematic of your amplifier for P-channel Fets is Wrong.....
Correct it.


I like the simplicity of your amplifier, at what current your VAS is running, since your driving a bunch of 10 Fet pairs directly.

Kanwar
I do not have the EAGLE TO247AC for P.

Current T6-T7 = 10 15 mA/pair, 10 pairs of 100-150 mA.
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Old 19th June 2010, 04:46 AM   #17
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Originally Posted by Federmann View Post
I do not have the EAGLE TO247AC for P.

Current T6-T7 = 10 15 mA/pair, 10 pairs of 100-150 mA.
Strange to know that you dont have symbol for P-channel in eagle for schematics.

Running VAS at 100-150mA means differential pair transistors must be running at around 10-15mA
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Old 19th June 2010, 07:50 AM   #18
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Corrected. I created a custom library IRFP9240.
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Old 19th June 2010, 08:28 AM   #19
wahab is offline wahab  Algeria
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Quote:
Originally Posted by Aldotin View Post
10 pair of IRFP mosfets driven by the VAS directly?!

well, it s doable if one is satisfied with a THD ratio that
is ten fold higher than when adding an EF buffer stage....
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Old 19th June 2010, 08:39 AM   #20
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Quote:
Originally Posted by wahab View Post
well, it s doable if one is satisfied with a THD ratio that
is ten fold higher than when adding an EF buffer stage....

Please do not measure THD at 1kHz, measure, please THD at 100kHz. Many transistors does a very slow amplifier.
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