10-10-2012, 09:01 AM
Regarding switching, some sets don't have polarised mains connectors, thus chassis can be live or neutral.
If you are using a DPST mains switch and are worried about live but not neutral switching, then connect a neon (e.g. NE2 + dropper) between the chassis and a known neutral (unswitched side of mains). If, as in the case of the DAC90A, you don't necessarily know which side is neutral, use two NE2s from chassis, one to each side of the incoming mains. If either is glowing, the chassis is still connected to one side of the mains (you can determine which one by labelling the neons)
If a neon glows at any time, the chassis is potentially (!) live! If the chassis is really isolated, then neither neon should strike...
If you are using a DPST mains switch and are worried about live but not neutral switching, then connect a neon (e.g. NE2 + dropper) between the chassis and a known neutral (unswitched side of mains). If, as in the case of the DAC90A, you don't necessarily know which side is neutral, use two NE2s from chassis, one to each side of the incoming mains. If either is glowing, the chassis is still connected to one side of the mains (you can determine which one by labelling the neons)
If a neon glows at any time, the chassis is potentially (!) live! If the chassis is really isolated, then neither neon should strike...
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