[sdiy] DC-DC Converters

[Roman]

I gave my dad old military vacum tube radio for last birthday.
It uses 2.4V power (batteries or external), and has DC-DC to
generate all those high voltage stuff vacum tubes need.
It was audible at maybe 10kHz.
And the radio's reception is very good and low noise comparing to
whatever they make today.
Sure, DC/DC can be done right, but the radio weigh about 10kg,
more than half of it probably is shielding.

Roman

----- Original Message -----
From: "Shokwave" <shokwave at nb.aibn.com>
To: <WeAreAs1 at aol.com>; <synth-diy at dropmix.xs4all.nl>
Sent: Wednesday, March 24, 2004 4:00 AM
Subject: Re: [sdiy] DC-DC Converters


>
> ----- Original Message -----
> From: <WeAreAs1 at aol.com>
>
> > Indeed, there is no reason to dismiss them out of hand.  Many of our
> favorite
> > music-making machines have switching power supplies, and you'd be very
> > hard-pressed to ever hear that the power supply is causing audible
> artifacts, or
> > tuning/stability problems with VCO's.
>
> Indeed, I've been wondering about this. As a new ham radio operator, I
> recently purchased an all-band, all-mode rig and needed a PS for it.
Imagine
> my surprise when I noticed that many, many companies sold switching
supplies
> for use with HF/VHF/UHF radios! I was floored; the SDIY motto has always
> been "linear please". Anyway, a couple of local EE/ham types told me to
get
> a linear, as they were quieter, but obviously many people feel that their
> extremely sensitive radio VCO's work great from switching supplies. They
ARE
> more efficient, and tend to be much smaller/lighter.
>
> My SDIY prejudices made me buy a linear PS in the end, of course.
>
> -Darren
>