Re: mains inverters, I have found that although my Nikkai puts out some
noise, it beats the more expensive model from "maplins" hands down
getting a mains inverter was probably the best thing i've ever done for
all the best
Tim Bucknall, N.W England
----- Original Message -----
From: "pseudospark" <shansen@...>
Sent: Monday, April 01, 2002 1:26 AM
Subject: [VLF_Group] Re: Recording
> --- In VLF_Group@y..., Eric Vogel <evogel@f...> wrote:
> > I have used a small inverter to run my laptop from the cigarette
> > lighter socket....the inverter may well make so much noise that it
> > is a waste of time.
> Eric, 12 to 120 volt DC-AC inverters may have a high frequency step
> up stage (several tens of kHz) followed by rectification and then an
> AC bridge to get the 60 Hz or they may step up at 60 Hz. The former
> scheme keeps the weight of the magnetics low. Either way the output
> is 60 Hz and may well cause havoc with VLF reception.
> However, there are DC-DC converters that take the car battery voltage
> to the 16 volts required by the laptop. My guess is that the step up
> is at a high frequency, again to lessen the amount of iron. I've
> never used one of these but it'd be interesting to know how they work
> in terms of VLF interference.
> As for my project, I loaded Gram 6 onto one of my IBM 380s and it
> looks like a great solution for field recording. I guess the ultimate
> add ons for this old laptop would be a VXpocket PCMCIA sound card (a
> few hundred dollars) and an Electrovaya external 11 A-H battery
> (another few hundred dollars).
> Steve Hansen
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