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RC-M70C voltage on chassis when plugged in


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#31 dan

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Posted 12 April 2019 - 04:24 PM

got the 12VDC adapter today and would you believe with that hooked up, there's about 50VAC at 70uA from the earth screw on the chassis to earth ground!

 

how this is even possible? i'm assuming there's galvanic isolation between the AC/DC 120VAC to 12VDC transformer so even if the DC12V backfed to the transformer in the M70, current shouldn't be flowing between the m70 and earth ground because of isolation.



#32 Fatdog

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Posted 12 April 2019 - 05:19 PM

12f94c.jpg



#33 Transistorized

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Posted 12 April 2019 - 09:31 PM

So far mine has been behaving...and that's the way I like it.

 

Hopefully you will get it all sorted. 



#34 Superduper

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Posted 12 April 2019 - 10:37 PM

Don’t presume anything, check. Just because it’s a DC adapter doesn’t mean anything, it’s still plugged into AC.

#35 dan

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Posted 13 April 2019 - 02:03 AM

Don’t presume anything, check. Just because it’s a DC adapter doesn’t mean anything, it’s still plugged into AC.

 

 

i checked the specs of the ac/dc adapter and it states it has a 0.250mA max leakage current. so much for that experiment. when i get my belts and open the m70 up again, i'll disconnect that black wire again and see if that 50v disappears.