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Guest cygnet

Regulated 12v

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Guest cygnet   
Guest cygnet

I am trying to find a way of powering my Ipod docking station which requires a regulated 12v. Although there are 1 or 2 cheapish options, which I have tried but due to a failure I think I may have damaged my equipment, I cannot find a good option. All I am looking to do is stop the spiking when the engine is on and charging. All I want to do is have a 12v regulated supply for some of my equipment. I have been trying everywhere to find a decent 12dc/12dc regulator.

CAN ANYBODY PLEASE HELP

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Cygnet,

I have not heard of this issue before, a 12 volt lead acid battery eg car or boat battery is usually a very good regulator (13.8 volt) and smoother (getting rid of noise etc due to low internal resistance), however you may need to take the supply from a point near the battery. How good is your battery? a poorly cell can destroy these qualitys

The other thing that goes through my mind is to have a word with one or two amateur radio suppliers, I can give you some details if you wish. It is possible they have adapters for hand held radio equipmemt which is more than just a cigar lighter plug. Ought to be at some of the prices.

Another thought that goes through my mind, belt and braces and a little bit clumsy is to use a small inverter and a good quality regulated mains unit

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Guest

If you either build a coil and capacitor that will act as a filter or an easy way is to wrap a few turns of the power lead around a ferrite ring.

That should do the same job.

The amount of spikes may be too great for the above and without an oscilloscope it will be a hard job to say if it has worked.

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You should be able to get hold of voltage regulator chips at Maplin - These will keep the voltage nice and clean, although often the actual reg will need a decent heatsink to keep it running happily.

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Paul

easy way is to wrap a few turns of the power lead around a ferrite ring.

I would have thought that if the spikes are big enough to do damage that a ferrite ring would present not nearly enough inductance to have any effect. A ferrite ring is normally only effective at RF frequencies and the result of the turns creates a low pass filter by introducing both capacitance and inductance

The big inductor and capacitor however might. I am still concerned however that this should even have happened, certainly an alternator can bang out quite a high voltage but I would expect the battery to keep this down to 14 volts

Jonzo's idea of an ic regulator sounds good, I would include a 100nF capacitor to prevent it oscillating and probably a hunking great electrolytic as well for good measure, although that may be ott.

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Guest cygnet   
Guest cygnet

Thank you all for your ideas which I will have a look at. However it seems that the best way is to get an invertor, thus changing 12v into 240v and using the supplied transformer to change it back to 12v. (Simple really!!!!!!!)

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Maplin sell the laptop dc-dc regulated adapters for about £20. Saves all that ugly messing about with inverters.

Sadly though, inverters have other uses and (inefficiencies aside) if you did buy one it would probably be more useful in terms of charging other items such as phones too. We tend to use our cheapy inverter for charging phones on hireboats.

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