monokinetic Posted October 14, 2007 Report Share Posted October 14, 2007 Hi all,I am following Duggle's power supply, as seen here, using a 12 V AC powerpack / wallwart. The problem is that the wallwart was supplied with bare cables and no markings what could be ground, so I can't work out what to connect to the ground of my breadboard of Duggle's circuit! I haven't done any AC stuff before so bear with me here: with a DC PSU I would measure across + and - and look at the polarity shown on my multimeter. I have an AC setting on the multimeter and I have used this to measure across both outputs on the wallwart, but connected either way the multimeter shows no polarity. Any suggestions?I presume it does matter which is negative and positive with such a wallwart?Thanks in advance for any helpDave mK Quote Link to comment Share on other sites More sharing options...
nILS Posted October 14, 2007 Report Share Posted October 14, 2007 AC = ALTERNATING current, that means that it switches polarity at 50 (or 60)Hz (50 (or 60) times a second). So, there IS NO polarity, hence the cable isn't marked ;)See: http://en.wikipedia.org/wiki/Alternating_current Quote Link to comment Share on other sites More sharing options...
monokinetic Posted October 15, 2007 Author Report Share Posted October 15, 2007 I had a feeling that would be the case, just wanted to be sure before frying anything :)so I will connect up the cables this evening with a bit more confidence, thanks.D Quote Link to comment Share on other sites More sharing options...
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