Message-ID: <50C9763F20ED43FC9C7DF7AB4FB7578C@AGB>
From: "Graham" <g8fzk@g8fzk.fsnet.co.uk>
To: <rsgb_lf_group@blacksheep.org>
References: <CAKvcm2cwyEg8XqiD6S4cd9B1eBVdte4vY7xU2O-i5NFrODmgjg@mail.gmail.com> <CAKvcm2djsOaEvA5=vM7MVr8TVY7RQvTtW2r_U1OpcxHjdLNGCA@mail.gmail.com>
In-Reply-To: <CAKvcm2djsOaEvA5=vM7MVr8TVY7RQvTtW2r_U1OpcxHjdLNGCA@mail.gmail.com>
Date: Wed, 5 Sep 2012 23:07:16 +0100
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Subject: Re: LF: Caps for Class-E amp
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Good  article  

Tnx -G.  

--------------------------------------------------
From: "Dimitrios Tsifakis" <dtsifakis@gmail.com>
Sent: Wednesday, September 05, 2012 10:46 PM
To: <rsgb_lf_group@blacksheep.org>
Subject: Re: LF: Caps for Class-E amp

> I have written up my experience building this Class-E PA for LF here:
> 
> http://people.physics.anu.edu.au/~dxt103/class-e/
> 
> Maybe other beginner LF operators will find this useful.
> 
> 73, Dimtris VK1SV
> 
> 2012/8/9 Dimitrios Tsifakis <dtsifakis@gmail.com>:
>> Hello LF group,
>>
>> I am building a 200 W Class-E transmitter for LF but keep killing the
>> capacitors in the output circuit (both C1 and C2 according to the
>> schematic in  Sokal's QST article). I have used a mixture WIMA
>> polypropylene MKP10, MKP4 and  FKP1 caps and I haven't damaged any FKP
>> ones so far. Should I not bother with MKP and use only FKP caps or is
>> there any other type of capacitor what will do the job? I need a
>> couple of hundred of nanofarads. The voltage rating of the caps I
>> destroyed was 400 VDC or 250 VAC. I can see that these caps have a
>> decreasing AC rating as the frequency goes up, but that's what I had
>> in the junk box at the time...
>>
>> The mode of failure of these MKP10 0.1 400 VDC caps is interesting
>> too, they seem to go down in capacitance as the damage progresses.
>>
>> Any advice is appreciated.
>>
>> 73, Dimitris VK1SV/SV1DET
>>
>