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Re: IR Remote Control [message #75183 is a reply to message #75179]

Tue, 08 January 2013 10:40

gofar99
Messages: 1947
Registered: May 2010
Location: Southern Arizona

Illuminati (5th Degree)

Hi Yes indeed just like the rabbit in Alice in Wonderland. Rolling Eyes

Anyhow, yes grounding is not nearly as simple as it would seem. In a typical audio project I use the metal chassis (if there is one) as a shield directly connected to the earth side of the AC mains at the input power jack. I use only IEC three wire connections and always a line filter there. I isolate the power supply and signal portions of the circuitry and at a single point of each connect them together. Often at the input as mentioned before. Then from there connect the chassis to the circuitry ground through a 0.1 to 0.22 uf type X2 capacitor with a parallel resistor in the range of 120-150 ohms. This arrangement does two thing, first lets the chassis act as a shield for the stuff inside, and second as a protective barrier if there is an internal fault that would possibly energize the chassis. I use the buss arrangement on occasion as well. This can be the case when there are numerous physically isolated ground connections. I still keep the power and signal grounds separated though. It may then require two busses that eventually connect. I like to use silver wire for the signal buss and large diameter copper wire (12g or larger) for the power buss. The choice of wire largely depends on the the magnitude of the current flow and how low the impedance must be for good S/N.

As Wayne noted when it all connects to the AC power source things can get a bit funky. You can get external ground loops through the AC ground just as easily as internal ones. The bit about CATV systems is right on. I had that problem in one set up. The CATV and AC mains grounds were not the same and a huge amount of noise was introduced into the audio. The fix for that was a ground isolator in the CATV line. My present stereo is not connected to the CATV or any other external source (like Ethernet) thus no contamination.

I guess I went down the same rabbit hole. Smile

Good Listening
Bruce

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[Message index]

		IR Remote Control By: skywave-rider on Fri, 25 May 2012 15:46
		Re: IR Remote Control By: Wayne Parham on Fri, 25 May 2012 18:49
		Re: IR Remote Control By: skywave-rider on Sun, 27 May 2012 15:39
		Re: IR Remote Control By: Wayne Parham on Sun, 27 May 2012 19:50
		Re: IR Remote Control By: skywave-rider on Thu, 31 May 2012 13:52
		Re: IR Remote Control By: Wayne Parham on Thu, 31 May 2012 17:47
		Re: IR Remote Control By: Bill Epstein on Tue, 05 June 2012 13:16
		Re: IR Remote Control By: Wayne Parham on Tue, 05 June 2012 15:19
		Re: IR Remote Control By: Bill Epstein on Sun, 10 June 2012 06:36
		Re: IR Remote Control By: skywave-rider on Sun, 10 June 2012 09:26
		Re: IR Remote Control By: Wayne Parham on Sun, 10 June 2012 09:53
		Re: IR Remote Control By: Bill Epstein on Sun, 10 June 2012 11:08
		Re: IR Remote Control By: skywave-rider on Sun, 10 June 2012 12:22
		Re: IR Remote Control By: Bill Epstein on Sun, 10 June 2012 13:58
		Re: IR Remote Control By: skywave-rider on Sun, 10 June 2012 19:30
		Re: IR Remote Control By: Wayne Parham on Sun, 10 June 2012 21:15
		Re: IR Remote Control By: skywave-rider on Thu, 14 June 2012 18:02
		Re: IR Remote Control By: skywave-rider on Sat, 16 June 2012 18:52
		Re: IR Remote Control By: Wayne Parham on Sat, 16 June 2012 21:26
		Re: IR Remote Control By: Bill Epstein on Sun, 17 June 2012 09:20
		Re: IR Remote Control By: skywave-rider on Sun, 17 June 2012 11:11
		Re: IR Remote Control By: skywave-rider on Wed, 20 June 2012 16:49
		Re: IR Remote Control By: Wayne Parham on Wed, 20 June 2012 19:12
		Re: IR Remote Control By: skywave-rider on Wed, 20 June 2012 22:36
		Re: IR Remote Control By: gofar99 on Thu, 21 June 2012 13:31
		Re: IR Remote Control By: Bill Epstein on Thu, 28 June 2012 05:53
		Re: IR Remote Control By: Wayne Parham on Thu, 30 August 2012 23:47
		Re: IR Remote Control By: gofar99 on Fri, 31 August 2012 15:33
		Re: IR Remote Control By: Wayne Parham on Fri, 31 August 2012 16:19
		Re: IR Remote Control By: gofar99 on Fri, 31 August 2012 21:25
		Re: IR Remote Control By: Wayne Parham on Mon, 24 September 2012 01:06
		Re: IR Remote Control By: Wayne Parham on Sun, 30 September 2012 11:46
		Re: IR Remote Control By: Shane on Tue, 16 October 2012 10:58
		Re: IR Remote Control By: Wayne Parham on Tue, 16 October 2012 11:22
		Re: IR Remote Control By: Shane on Tue, 16 October 2012 13:49
		Re: IR Remote Control By: Wayne Parham on Tue, 16 October 2012 15:23
		Re: IR Remote Control By: Shane on Fri, 19 October 2012 22:19
		Re: IR Remote Control By: Wayne Parham on Sat, 20 October 2012 10:14
		Re: IR Remote Control By: Shane on Tue, 30 October 2012 22:00
		Re: IR Remote Control By: Wayne Parham on Wed, 31 October 2012 20:50
		Re: IR Remote Control By: Wayne Parham on Tue, 20 November 2012 00:34
		Re: IR Remote Control By: gofar99 on Tue, 20 November 2012 19:41
		Re: IR Remote Control By: Shane on Tue, 20 November 2012 20:42
		Re: IR Remote Control By: gofar99 on Tue, 20 November 2012 21:06
		Re: IR Remote Control By: Shane on Tue, 20 November 2012 22:26
		Re: IR Remote Control By: Wayne Parham on Tue, 20 November 2012 23:27
		Re: IR Remote Control By: Wayne Parham on Sun, 30 December 2012 19:50
		Re: IR Remote Control By: Wayne Parham on Sun, 06 January 2013 20:58
		Re: IR Remote Control By: Shane on Sun, 06 January 2013 21:48
		Re: IR Remote Control By: Wayne Parham on Mon, 07 January 2013 11:04
		Re: IR Remote Control By: gofar99 on Mon, 07 January 2013 21:51
		Re: IR Remote Control By: Shane on Mon, 07 January 2013 22:23
		Re: IR Remote Control By: Wayne Parham on Tue, 08 January 2013 10:11
		Re: IR Remote Control By: gofar99 on Tue, 08 January 2013 10:40
		Re: IR Remote Control By: Wayne Parham on Tue, 08 January 2013 11:31
		Re: IR Remote Control By: Wayne Parham on Thu, 10 January 2013 23:06
		Re: IR Remote Control By: Wayne Parham on Mon, 14 January 2013 01:45

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