Comments on: Chokes in C Major https://diyparadise.com/w/chokes-in-c-major/ ... where we have more fun! ... Fri, 29 Mar 2013 10:56:56 +0000 hourly 1 https://wordpress.org/?v=6.0.9 By: yeo https://diyparadise.com/w/chokes-in-c-major/#comment-56 Mon, 21 Mar 2011 11:08:36 +0000 http://127.0.0.1/wordpress63/?p=59#comment-56 hi albert

by calculation, it’s ~250nf. however, if the choke has a tolerance of say 10%, i’ll use a few values, but start off with this.

please note that this is to reject power supply ripple of 120hz (i believe canada’s mains frequency is 60hz, hence 2*60). it can’t reject other type of noise, though it may help some what.

yeo

]]> By: Albert Li https://diyparadise.com/w/chokes-in-c-major/#comment-55 Sun, 20 Mar 2011 06:54:47 +0000 http://127.0.0.1/wordpress63/?p=59#comment-55 Hi Yeo,

Here come an old and lazy bugger from Canada. I really would love to try the ‘choke in C minor’ on my new built 6as7 power amp which creates some noise I couldn’t find with many month effort. I’m not good on math and don’t know what sqr/or pi are for. Would you please do the math for me. I have full rectifier with 4x 4007 and my hammond choke is 7H.
Thanks in advance
Albert

]]> By: yeo https://diyparadise.com/w/chokes-in-c-major/#comment-54 Mon, 01 Mar 2010 22:09:34 +0000 http://127.0.0.1/wordpress63/?p=59#comment-54 readers david bliss as well as roy talbert corrected the error in the above equation.

instead of
C = 1/[sqr(2*pi*L)*f]

it should be
C = 1/[sqr(2*pi*f)*L]

thx for spotting the error!

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