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Re: [Xylo-SDR] RFC - Powers
Sorry I didn't address inside/outside for the power source. If the power
requirements are modest, then an internal power supply is desirable from
a wiring point. A small switcher specially when fed by +13.8V, with
plenty of noise reducing techniques could live inside the box without
major problems.
Also if the power requirements are modest then there is a second
alternative, I have several wall warts that put out +5 volts at 5A, +-12
at 1.5A. These came from equipment that was trashed at work, so something
similar should be available. This has the advantage of removing a source
of electrical noise from the box, and a source of heat that can make the
oscillators drift, while keeping it to one power cord into the
box.
If you desire to have a HF amplifier in the box of modest power, there is
little choice but to have an external power supply, the box is too small
to handle a lot of heat.
At 04:03 PM 1/15/2006, you wrote:
Folks
Changed the subject in the header.
I hope folks like Bill ? KD5TFD, Phil ? VK6APH, Phil ? N8VB are designing
their projects based on some of the constants we are defining are NOT
reading all this stuff based on subject. Hopefully they WILL trust that
we are commenting and deciding and are keeping their project in
mind.
What powers do we want coming into the MB?
Do we want to create a power board within the enclosure or have power
source external to the enclosure?
I?ll kick it off.
I would like to see us use the ?rest? of our 100 x 156 (ID) x 113 mm
enclosure for a powers board.
I would like to see a SINGLE 12 volt input to the back of the enclosure
with other voltages derived from that via DC-DC regulators.
On project board regulators should use the power supplied from this slide
in board for component power, from the buss.
Thoughts for the ?rest of the space? is take +12 Volt input from the back
of the enclosure to a DC to DC converter to supply:
+12 V ( passthru from back panel regulated, not highly filtered,
unlimited current)
5 V
+/- 15 V.
Comments?
Eric
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Cecil Bayona
KD5NWA
www.qrpradio.com
"I fail to see why doing the same thing over and over and
getting the same results every time is insanity: I've almost proved it
isn't; only a few more tests now and I'm sure results will differ this
time ... "