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[TCML] Re: Terry/lowpass filter design, OBIT



Hi Joshua,

"On Wed, Nov 24, 2021, 7:58 PM Joshua Thomas <joshuafthomas@xxxxxxxxx>
wrote:

Gary, I had been reading your notes on filtering and resistor inductance
here: http://www.laushaus.com/rcl_filter_simulation.htm

I had to check with the manufacturer, but the self-inductance of my 500 ohm
wire-wound capacitors is 220 uH. My resistor's actual measurement is 470
ohm. An RCL simulator with 470 ohm, 220 uH and 1 nF (the setup I was using)
shows a small signal gain in the frequency range my coil resonates. It's
not much - less than 2 dB - but it's enough to make me wonder if this
contributed to the damage to my capacitors.

I will be choosing a capacitance value for the rebuild of the filter which
doesn't have any gain in my coil resonant range. As well as significantly
more capacitors to limit the stress per capacitor.

-Joshua Thomas"



I want to say to not forget at the time of burning them up you were
accidentally floating your center tap NST. Could very well be a factor
also...

Chris Reeland
Ladd Illinois USA

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