I bought a module off ebay for a project recently. It has a LM317/LM337
pair, small heat sinks, regulator, bypass caps, rectifiers and filtering
caps all on one board for about $10 delivered. To this you add a small
transformer and piggy-back a 7805T/heat sink and that would give the 3
voltages required by this unit.
Of course it's linear so it's got the linear heat dissipation issue but by
the right pick of transformer that could be as low as about 3W (around 2KWH
per month). Then again, it's also got the linear noise "problems" which are
pretty much zero.
73/jeff/ac0c
www.ac0c.com
alpha-charlie-zero-charlie
-----Original Message-----
From: Bob kb8tq
Sent: Wednesday, August 31, 2016 7:49 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Anybody want a Thunderbolt power supply?
Hi
It is not that hard to do. Use a linear rather than a switching approach.
Run the +12 and +5 supplies off of LT1764 regulators. The -12 is very low
current, run it off of a low noise op amp. There are lots of toroidal line
transformers that will drive something like this.
Bob
On Aug 31, 2016, at 6:20 PM, Cube Central <cubecent...@gmail.com> wrote:
Wow, given all the responses about the cleanliness of the power into a
Thunderbolt, I would be even more interested in a power supply that did
*not* leave the "last mile" up to me. I would be more interested in a
"pretty clean" power supply that I could just plug in and go. Any
thoughts of me actually wiring the last bit of it make me break out in a
cold sweat and come face to face with my (established, and sadly
slow-to-expand) limitations.
Maybe I'm the only one that would be interested in such a solution? I
hope not, but I can see that there is a lot to consider about such a
thing.
Cheers!
-Randal
(at CubeCentral)
-----Original Message-----
From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of Bob
Stewart
Sent: Wednesday, 31 August, 2016 15:29
To: Discussion of precise time and frequency measurement
<time-nuts@febo.com>
Subject: Re: [time-nuts] Anybody want a Thunderbolt power supply?
OTOH, how many time-nuts have any interest in paying for a power supply
that's up to time-nuts standards? It's really not easy to bring a small
product to market at a small price. Even if you completely discount the
personal effort of design, construction, and marketing, there's the issue
of packaging. Without a package, it's just an amateur effort not worth
considering. With a package, such as a Hammond box, the price moves into
new territory and nobody's interested.
Bob
From: Charles Steinmetz <csteinm...@yandex.com>
To: time-nuts@febo.com
Sent: Wednesday, August 31, 2016 4:24 PM
Subject: Re: [time-nuts] Anybody want a Thunderbolt power supply?
Mark wrote:
Some times a full linear supply is not a viable option due to power
dissipation/size issues or the utter convenience of using a switching
wall wart.
In the context of the present discussion -- powering a Tbolt for time-nuts
use -- the first consideration would just be laughable and the second
would be nothing but terminal laziness.
Best regards,
Charles
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