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Re: LF: df2py @ 137.4/new match

from [Stefan Schäfer] [Permanent Link][Original]
To: [email protected]
Subject: Re: LF: df2py @ 137.4/new match
From: Stefan Schäfer <[email protected]>
Date: Mon, 12 Jul 2010 01:00:41 +0200
In-reply-to: <640773929BA743ACA9D2703EEAC2058C@df2py>
References: <2E1625BBD491430EBA80E631855F5E23@df2py> <[email protected]> <640773929BA743ACA9D2703EEAC2058C@df2py>
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Hi Wolf,

Some types of audio amps have problems with reactive power. Do you really need a linear PA? Ah i suppose it is a linear PA, but in switch mode anyway? But why do you need much cooling then? A class D PA would be enough and the power dissipation is minimal! IRFP-460 is a good choice.

GL es hpe cu sn!

73 de DK7FC

Am 11.07.2010 22:41, schrieb Wolf Ostwald:

Hi Stefan !

I just build a new amp with IRFP 460, much sturdier MosFet. But I need lots of cooling. That killed a few black ones ( IRFP 350 ).

And I managed to trash my 5kW NF-Amp for 9 kcs, wait for parts now.

Same time work on coil wound on a trash-can J

Things are being pushed here, but family and job are putting a brake on things J, if I don’t obey i`ll find myself between a rock and a hard place J

Keep u posted  de wolf  df2py

 

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