We're hitting the posting limit on this one. Let's wind it down in the next 3-4
posts at most. Then thread closed for now.
Eric
/elecraft.com/
On 10/2/2015 4:32 PM, Joe Subich, W4TV wrote:
Doing so reduces any IR drop on power supply wiring by a factor of 2
or 3.
Higher voltage - 24 or 40 V results in decreasing the voltage drop by a
factor or 4 or 9. The voltage drop is a function of current *squared*.
24 or 48 volt finals certainly produce much cleaner signals as the
active devices are not likely to be driven into current saturation
*or* cutoff in order to reach useful power output where the 12V devices
are pushed to the wall to make 100W output.
73,
... Joe, W4TV
On 10/2/2015 4:12 PM, brian wrote:
Fred,
I'm a fan of higher voltage -- perhaps 24 or 40 volts so that PA
transistors can produce cleaner signals. Doing so reduces any IR drop
on power supply wiring by a factor of 2 or 3. KISS.
IC's are going to lower and lower voltages. Multiple circuits within
boxes require a menagerie of voltages. One is faced with having to
generate more heat in regulators dropping 40 volts to 12, maybe 5, 3.3
and 1.6 V. Perhaps the era of efficient multivoltage power supplies
with multiple wires for multiple voltages will return. (Remember
filament ,plate, screen and grid voltage power supplies in days of
yore? Guys generally didn't mistakenly hook up the 3500 V B+ wire to
the filaments......)
73 de Brian/K3KO
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