ceecrb1 Posted April 11, 2008 Share Posted April 11, 2008 got some amps here with GROUND LINK switches. Do what?¿?¿?¿? Very ashamed being mr noise boy.Guess some things just got skipped in my hands on learning..... :P Link to comment Share on other sites More sharing options...
boatman Posted April 11, 2008 Share Posted April 11, 2008 Telling us the make and model number of the amps might help people to give you the right information. My experience is mostly with video equipment but I would guess at isolation/connection of mains earth and signal ground. However, I could be wrong. Link to comment Share on other sites More sharing options...
Malcolm Gordon Posted April 11, 2008 Share Posted April 11, 2008 Ground Link is the opposite of Ground Lift, the separation of signal earth (ground) from the amplifier protective earth to avoid hum loops through the input cable from the mixer. Removal of the earth wire from the mains plug to achieve the same result should obviously never be done, for safety reasons. Ground Link OFF = Ground (Earth) Lift ON = FLOAT. HTH Reply prepared before the above was noted Link to comment Share on other sites More sharing options...
ceecrb1 Posted April 11, 2008 Author Share Posted April 11, 2008 tecno star audio amp, a small brand from here in valencia,truth is I was thinking ground lift but typo, being "spanish"....not far off... very good. Link to comment Share on other sites More sharing options...
paulears Posted April 11, 2008 Share Posted April 11, 2008 Over on the theatre-sound list - any mention of ground lift/link brings everyone out in a sweat. They have discussed this one for years. Boiling it all down, pretty well all quality product has a totally separate ground for signal purposes to the safety ground for the chassis. Some manufacturers, however, bond the two together causing the common earth loop hum we spend ages disconnecting screens to cure - by providing the multiple paths. The switch simply allows the useful separate purpose grounds to be linked. So we kind of lift grounds to solve noise problems, usually mains induced hum - but on some configurations of kit, nowhere is the audio path grounded at all - which in itself can cause noise problems. The amp switch can be a handy way of introducing the single ground path required to do it. "The pin 1 problem" is a handy thing to bash into Google, and the topic (if you can stand it) is here. Link to comment Share on other sites More sharing options...
p.k.roberts Posted April 11, 2008 Share Posted April 11, 2008 There's also a useful document here; http://campuspa.com/downloads/aes48-2005-f.pdf Link to comment Share on other sites More sharing options...
p.k.roberts Posted April 14, 2008 Share Posted April 14, 2008 There's also a useful document here; http://campuspa.com/downloads/aes48-2005-f.pdf and another one here, but not for the faint hearted ..... http://www.tonywaldron.co.uk/ Link to comment Share on other sites More sharing options...
J Pearce Posted April 14, 2008 Share Posted April 14, 2008 I was also about to recommend Tony Waldron's various articles and papers on audio grounding. Not exactly light reading however. Link to comment Share on other sites More sharing options...
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