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Loudspeaker to Line Level Pad
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<blockquote data-quote="Mark DeArman" data-source="post: 39323" data-attributes="member: 950"><p>Re: Loudspeaker to Line Level Pad</p><p></p><p>As a side note on this subject, if anyone was interested in building a properly functioning V-I box for loudspeaker testing, they may have realized there is a high common mode voltage on the current sense resistor. In fact it has always amazed me that the commercial V-I boxes act as if it’s fine to plug in them into a sound card even though the common mode rejection is at best 50V for most differential inputs even on very high end equipment. I found a part from Texas Instruments a while ago that makes this measurement safe as it has a CMR of 200V. And it comes in a DIP package. <a href="http://www.ti.com/product/ina117" target="_blank">http://www.ti.com/product/ina117</a></p></blockquote><p></p>
[QUOTE="Mark DeArman, post: 39323, member: 950"] Re: Loudspeaker to Line Level Pad As a side note on this subject, if anyone was interested in building a properly functioning V-I box for loudspeaker testing, they may have realized there is a high common mode voltage on the current sense resistor. In fact it has always amazed me that the commercial V-I boxes act as if it’s fine to plug in them into a sound card even though the common mode rejection is at best 50V for most differential inputs even on very high end equipment. I found a part from Texas Instruments a while ago that makes this measurement safe as it has a CMR of 200V. And it comes in a DIP package. [URL]http://www.ti.com/product/ina117[/URL] [/QUOTE]
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