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Junior Varsity
Complete the DC circuit?
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<blockquote data-quote="Mike Sokol" data-source="post: 64608" data-attributes="member: 1989"><p>Re: Complete the DC circuit?</p><p></p><p>While pin-1 on the XLR inputs of a console are bonded to the board ground, it's possible it create a phantom voltage on the body of a condenser mic if you accidentally use a pin-1 lifted XLR cable. However the mic won't work. The 48 volts DC on phantom power is current limited, so not really dangerous. But it is really scary to a guitar player putting his lips up to it. I've also seen a bunch of import XLR cables that were simply wired wrong, so I could see how a miswired XLR could place the 48 volt DC on the body of a dynamic mic and it would still operate. </p><p></p><p>A really cheap gadget to keep in your pocket for gigs is a Fluke VoltAlert or Amprobe NCVT (Non Contact Voltage Tester) like this: <a href="http://www.amprobe.com/amprobe/usen/electrical-testers/non-contact-voltage-detection/vp-600sb.htm?PID=73444" target="_blank">VP-600SB</a> </p><p>Even though these are rated for 90 to 1,000 volts, it will beep like crazy with as little as 40 volts if you hold it anywhere near a mixing board that's been energized by an ungrounded extension cord or even a RPBG (Reverse Polarity Bootleg Ground) outlet. See <a href="http://www.noshockzone.org" target="_blank">No Shock Zone</a> or <a href="http://www.youtube.com/watch?v=Y8h64X33aKg&feature=plcp" target="_blank">Hot Skin RV proximity test full scale - YouTube</a> for a video of me testing an electrified RV with a NCVT. </p><p></p><p>Email me directly if you have any questions at <a href="mailto:mike@noshockzone.org">mike@noshockzone.org</a></p></blockquote><p></p>
[QUOTE="Mike Sokol, post: 64608, member: 1989"] Re: Complete the DC circuit? While pin-1 on the XLR inputs of a console are bonded to the board ground, it's possible it create a phantom voltage on the body of a condenser mic if you accidentally use a pin-1 lifted XLR cable. However the mic won't work. The 48 volts DC on phantom power is current limited, so not really dangerous. But it is really scary to a guitar player putting his lips up to it. I've also seen a bunch of import XLR cables that were simply wired wrong, so I could see how a miswired XLR could place the 48 volt DC on the body of a dynamic mic and it would still operate. A really cheap gadget to keep in your pocket for gigs is a Fluke VoltAlert or Amprobe NCVT (Non Contact Voltage Tester) like this: [URL="http://www.amprobe.com/amprobe/usen/electrical-testers/non-contact-voltage-detection/vp-600sb.htm?PID=73444"]VP-600SB[/URL] Even though these are rated for 90 to 1,000 volts, it will beep like crazy with as little as 40 volts if you hold it anywhere near a mixing board that's been energized by an ungrounded extension cord or even a RPBG (Reverse Polarity Bootleg Ground) outlet. See [URL="http://www.noshockzone.org"]No Shock Zone[/URL] or [URL="http://www.youtube.com/watch?v=Y8h64X33aKg&feature=plcp"]Hot Skin RV proximity test full scale - YouTube[/URL] for a video of me testing an electrified RV with a NCVT. Email me directly if you have any questions at [EMAIL="mike@noshockzone.org"]mike@noshockzone.org[/EMAIL] [/QUOTE]
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