Comments on: Input and Output Impedance http://gaussmarkov.net/wordpress/thoughts/input-and-output-impedance/ guitar stompboxes and electronics Sun, 20 May 2012 22:42:43 -0700 hourly 1 http://wordpress.org/?v=3.1 By: John http://gaussmarkov.net/wordpress/thoughts/input-and-output-impedance/comment-page-1/#comment-1480 John Wed, 09 Feb 2011 12:13:26 +0000 http://gaussmarkov.net/wordpress/thoughts/input-and-output-impedance/#comment-1480 You prove again that teaching is an art. Great. Thanks. You prove again that teaching is an art. Great. Thanks.

]]> By: Nguyen Dang Minh http://gaussmarkov.net/wordpress/thoughts/input-and-output-impedance/comment-page-1/#comment-1474 Nguyen Dang Minh Sun, 23 Jan 2011 07:14:12 +0000 http://gaussmarkov.net/wordpress/thoughts/input-and-output-impedance/#comment-1474 This is the lesson of resistance and impedance that having simple explanations. thank very much. This is the lesson of resistance and impedance that having simple explanations. thank very much.

]]> By: Vishy http://gaussmarkov.net/wordpress/thoughts/input-and-output-impedance/comment-page-1/#comment-1439 Vishy Thu, 21 Oct 2010 15:27:32 +0000 http://gaussmarkov.net/wordpress/thoughts/input-and-output-impedance/#comment-1439 Superb compiled - thnx for d info Superb compiled – thnx for d info

]]> By: Ankur http://gaussmarkov.net/wordpress/thoughts/input-and-output-impedance/comment-page-1/#comment-1182 Ankur Thu, 27 Aug 2009 16:25:46 +0000 http://gaussmarkov.net/wordpress/thoughts/input-and-output-impedance/#comment-1182 It is really a awesome method to correlate and learn. I would recommend to read it once and make similar analogies for future reference. Thanks buddy. It is really a awesome method to correlate and learn. I would recommend to read it once and make similar analogies for future reference.

Thanks buddy.

]]> By: Hugo Gutierrez S. http://gaussmarkov.net/wordpress/thoughts/input-and-output-impedance/comment-page-1/#comment-918 Hugo Gutierrez S. Fri, 05 Sep 2008 22:13:24 +0000 http://gaussmarkov.net/wordpress/thoughts/input-and-output-impedance/#comment-918 Thanks for the circuit, I commit a great mistake, I do the circuit using the pattern reversed, this had as consequence to insert the IC in reverse mode. I had to invert the pins ... but it works fine. I used a LM741 insted the LM308 (hard to find in my country) , If anyone wants to know how to change it, go to http:\\hugosworld0.tripod.com, soon I will pubish how to do it. Regards Hugo Thanks for the circuit, I commit a great mistake, I do the circuit using the pattern reversed, this had as consequence to insert the IC in reverse mode. I had to invert the pins … but it works fine. I used a LM741 insted the LM308 (hard to find in my country) , If anyone wants to know how to change it, go to http:\\hugosworld0.tripod.com, soon I will pubish how to do it.

Regards

Hugo

]]> By: jacker http://gaussmarkov.net/wordpress/thoughts/input-and-output-impedance/comment-page-1/#comment-903 jacker Fri, 22 Aug 2008 14:16:27 +0000 http://gaussmarkov.net/wordpress/thoughts/input-and-output-impedance/#comment-903 A little more testing...I find a couple of things. On non-true-bypass pedals, it is interesting to measure input and output impedances both with pedal on and with it off. They change on many pedals. Also, with a 1Mohm pot it is extremely inaccurate or difficult to adjust, it would be smart to use a 100kohm pot for measuring output impedance. Wtih True Bypass, if you try to measure in or output with pedal off though you aren't measuring the pedal but the signal generator source. You generally want A little more testing…I find a couple of things. On non-true-bypass pedals, it is interesting to measure input and output impedances both with pedal on and with it off. They change on many pedals. Also, with a 1Mohm pot it is extremely inaccurate or difficult to adjust, it would be smart to use a 100kohm pot for measuring output impedance.

Wtih True Bypass, if you try to measure in or output with pedal off though you aren’t measuring the pedal but the signal generator source.

You generally want

]]> By: jacker http://gaussmarkov.net/wordpress/thoughts/input-and-output-impedance/comment-page-1/#comment-902 jacker Wed, 20 Aug 2008 18:48:58 +0000 http://gaussmarkov.net/wordpress/thoughts/input-and-output-impedance/#comment-902 Very nice writeup. Couple of small things, no need to measure the frequncy is there? Also, I think the 1M pot needs or ought to be linear. I just "built" this and tested a few pedals which had specs in their user manual (Boss, Ibanez..) and measured an output impedance that is about 100k less tn spec in real life. I tried output impedance measuring but I wonder if 1M is too big? I can't get it down to halfway... I also looked on a scope and the pot really rounds off the input signal (my input is more of a square wave, which may be messing wiith RMS values?) and there seems to be a second AC signal it rides on when it is at lowest, etc. Very nice writeup. Couple of small things, no need to measure the frequncy is there?
Also, I think the 1M pot needs or ought to be linear. I just “built” this and tested a few pedals which had specs in their user manual (Boss, Ibanez..) and measured an output impedance that is about 100k less tn spec in real life. I tried output impedance measuring but I wonder if 1M is too big? I can’t get it down to halfway… I also looked on a scope and the pot really rounds off the input signal (my input is more of a square wave, which may be messing wiith RMS values?) and there seems to be a second AC signal it rides on when it is at lowest, etc.

]]> By: plg http://gaussmarkov.net/wordpress/thoughts/input-and-output-impedance/comment-page-1/#comment-546 plg Tue, 05 Feb 2008 10:00:03 +0000 http://gaussmarkov.net/wordpress/thoughts/input-and-output-impedance/#comment-546 ... much compliments ! great article ;) … much compliments ! great article ;)

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