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Old 19 November 2003, 16:00   #21
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Techi
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Old 19 November 2003, 16:05   #22
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oh what a surprise! good on you I expect you get some good results
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Old 19 November 2003, 17:20   #23
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Cheers. Nice of you to say.
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Old 19 November 2003, 17:27   #24
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cheers again guys, i will keep you posted on how i get on.


regards
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Old 20 November 2003, 03:44   #25
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IF you can't / don't want to buy a bridge recifier, have a scavange on old tele's and other electrical kit. I think we robbed one out of a tele to fix the generator out in the bush in Zim.
Good luck, it will save you having to keep moving the battery and I've seen people cause dammage to the boat when moving them about.
Jelly
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Old 20 November 2003, 04:15   #26
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Its a long time since I did this, so don't shoot me if I'm wrong Jwaker, but don't you also require a "smoothing Electrolytic capacitor" to change it from its full wave rectifier sign to a more smooth DC.

Electronic equipment used to have a problem with unsmoothed rectified DC but this may not be still the case .

All IMHO


Paul
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Old 20 November 2003, 07:19   #27
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if you have a battery in parallel that will do the smoothing, but do not! connect electronic equipment without the battery.
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Old 20 November 2003, 18:58   #28
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There is a hand held thingy on e-bay to-day:

http://cgi.ebay.co.uk/ws/eBayISAPI.d...category=15263
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Old 23 November 2003, 15:26   #29
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Quote:
Originally posted by jackeen
Its a long time since I did this, so don't shoot me if I'm wrong Jwaker, but don't you also require a "smoothing Electrolytic capacitor" to change it from its full wave rectifier sign to a more smooth DC.

Electronic equipment used to have a problem with unsmoothed rectified DC but this may not be still the case .

All IMHO


Paul
Jackeen, as Nik says.

There will still be a bit of ripple but it'll be ok. Modern electronics will contain their own voltage regulator/smoothing.

If very unlucky, it could transmit a bit and buzz the radio.
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Old 24 November 2003, 09:32   #30
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rectifiers

I guess I should have made the point that with full wave rectification (a bridge rectifier) you are pretty safe. BUT, battery chargers often only use half wave rectification (cos its cheap) and it doesnt matter because the battery absorbs the peaks and smooths out the waveform.
I comprehensively blew an item up once by testing it on a battery charger, the peak voltage was much higher than the rms voltage.
This may be a different situation to what you find on an engines charger, but I hope its a useful warning anyway.
Nick.
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