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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 help

Dave mK

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