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Re: LF: PA problem

To: [email protected]
Subject: Re: LF: PA problem
From: DK7FC <[email protected]>
Date: Wed, 08 Nov 2017 14:52:34 +0100
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Am 08.11.2017 14:37, schrieb DK7FC:
And i would add a 1000 uF electrolytic capacitor with a low internal resistance (the good ones :-) ) near the Drain, in parallel to the 1 uF capacitor.
Sorry that was wrong. Actually there should be a small inductor between that large C and the drain, just a few uH, like others said before. That value is not so critical, it can be 10 uH or so.
73, Stefan

PS: In 2001 i built a 1 kW class E PA for 137 kHz using a single IRFP360 and 80V DC. I also built a 13.8 V version using a IRF540N giving 100 W. But it has always been a high effort to get a good efficiency. Since many years i prefer class D PAs.




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