[Elecraft] Off-topic... electronics ?

[John J. McDonough]

----- Original Message -----
From: "Tom Hammond N�SS" <n0ss@earthlink.net>
Subject: Re: [Elecraft] Off-topic... electronics ?


> You can build a small DC-to-DC invertor, using an
> NE555 (timer IC).

You can make a 555 work, but since you really don't need elaborate timing,
all you need is an oscillator that's "fast enough" to be easy to filter,
building a simple oscillator from CMOS gates works a lot better.  With CMOS
you can get a lot more efficiency from your charge pump.

> As I recall from a QST article of several years ago, there's
> also an IC  which does this all in one step.

There's a bunch of them.  Go loking for "Charge Pump" or "DC/DC converter".

> How much voltage AND currect do you need?

This is generally only a useful approach for low currents.

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