[Amps] Resonant filters + new email

[John Lyles]

I have established a new account here, moved over from my work email. For now on, this is it. 

In response to two questions, the Galaxy 300 values must be wrong. Also, the value of choke in resonance should be the value with little or no DC bias, to make the power supply act like it has critical inductance value when there is little load. There is no telling what the manufacturers specified on the data sheets for these power supplies. 

73
John
K5PRO

> How can the Harris filter (7 H * 0.25 uF = 1.75) and the Galaxy filter ( 
> 4 H * 0.1 uF = 0.4 ) be both resonant at the same frequency, 120 Hz?

> Message: 4
> Date: Tue, 15 May 2007 04:28:16 -0400
> From: "Tom W8JI" <w8ji at w8ji.com>
> Subject: Re: [Amps] resonant filter                       tspa
> To: "Angel Vilaseca" <avilaseca at bluewin.ch>
> Cc: amps at contesting.com
> Message-ID: <012601c796cb$2f651670$640fa8c0 at radioroom>
> Content-Type: text/plain; format=flowed; charset="iso-8859-1";
> 	reply-type=original
> 
> How can the Harris filter (7 H * 0.25 uF = 1.75) >>>
> 
> 120Hz
> 
> and the Galaxy filter (
> 4 H * 0.1 uF = 0.4 ) be both resonant at the same frequency, 
> 120 Hz?>>
> 
> 252Hz
> 
> Really needs a .4uF across that choke.