On Wed, 19 Nov 2003 13:09:00 -0000 "A.J Moss"
<linear.amplifier@ntlworld.com> writes:
<snip>
>
> If I were to make a floating adjustable regulated DC supply, I
> could use an ordinary pot to control the heater volts, meter it, and
> have a fine adjustment to within ca. 1V either way to set optimum
> heater volts. I could also then add a current limiting option on the
> regulator to limit inrush at switch-on
>
> Are there benefits, advantages, or just risks of using such a
> scheme? Constant unvarying power at the heaters seems good, but is
> 'less' 'more' to use the cliche.
>
> 73 and thanks for any input
>
> Adam
>
Hi Adam,
I wouldn't build the supply from scratch but... there are lots of
inexpensive surplus regulated switching supplies available that do a fine
job in that application. The better units come with inrush limiting,
plus crowbar circuits in case the supply goes crazy.
I've used both AC (tapped from before the rectifiers) & DC on the
heater with excellent results.
73 & Good afternoon,
Marv WC6W
*
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