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I would get mum to go pick it up. Our postman would moan carrying that 1/4 mile up our drivewayI see they quote £500 postage for that Westerly in the link. It'll take a helluva lot of wrapping paper for the parcel though .
Yeah sorry I wondered off on another thought path. Just sticking with it a min....Nope the schem is for a dc clamp meter, there is an offset adjust to zero the reading.
If your installing this permanent I wouldnt make it a clamp, just feed the wire thru, then the zero would be more stable.
ABB make some proper 'dc' current transformers, they work by using an op amp to balance out the magnetic field produced by the conductor, the control voltage being the current to voltage output.
Ah no sorry, this was off on a tangent, I was thinking mains voltage. This isnt boat related (my bad), just something else at the back of my mind thats all. Some stuff is best left there trust meDetecting 12v dc battery power non contact is tricky, there is hardly any electric field and no ac to pick up capacitively, probably the only way to do that is to have a bleed resistor dump some power so you can pick it up with the current meter, that or just bung a resistor divider and a meter or pic/'duino atod input across the power lines.
Silly suggestion:- A 555 could be configured to generate 100 khz rf, this can be injected to the power lines, lead acids tend to be high impedance to rf, then you can detect the rf on any power lines that are switch on, of course the switches would need to have enough isolation when off for the rf not to be coupled.
PLASTIC!!!!Yes you can detect mains voltage, a volt stick type circuit would do that, just a fet and led, plenty examples of those about.
Mains voltage and metal boats dont mix, and I dont mean safety wise, at least a norman is plastic.