Executive summary: you can power a surplus gold Thunderbolt using a
-5V supply in place of a -12V supply, and it will probably work just
fine.
Details: The manual for Trimble Thunderbolts specifies power supplies
of +5V, +12V, and -12V. It turns out that power supplies that provide
+5V, +12V,
Hi,
Interesting investigation, thanks for sharing. Another option I have used was
+12V +5V with the -12V rail powered by a 9V output isolated DC-DC converter
from an old thin ethernet network card. These come in either 5V or 12V input
and are effecitvely free (you also get 10MHz isolaton
Hi
The control voltage on the 12 V OCXO is likely 0-10V or 0-5V. The tune on the
3.3V part isn’t going to be above 3.3V and it may be 0-2.5V. The 3.3V part is
going to be at least 8X more sensitive to grounding issues.
To put this in perspective, you can see a change on a normal 12V part
On 10/31/13 4:02 AM, Bob Camp wrote:
Hi
The control voltage on the 12 V OCXO is likely 0-10V or 0-5V. The
tune on the 3.3V part isn’t going to be above 3.3V and it may be
0-2.5V. The 3.3V part is going to be at least 8X more sensitive to
grounding issues.
I've got a BUNCH of VCOs that are
A couple tricks I've learned along the way: 1) If using a switching supply is
required to get a higher voltage, follow it with a good LDO to reduce the noise
level. I've done this successfully for powering handheld radio microphones with
built-in amplification, video amplifiers, and for
I am just glad this thread ran. Just downloaded the paper and its one of
those questions I have had for a while but no time to do some digging.
Great!
Regards
Paul
WB8TSL
On Wed, Oct 30, 2013 at 7:33 PM, Magnus Danielson
mag...@rubidium.dyndns.org wrote:
On 10/31/2013 12:14 AM, Jim Lux wrote:
Bob,
These are good suggestions. I will probably end up doing 1) and 2) you
have outlined above.
Thanks!
John W.
On Thu, Oct 31, 2013 at 7:51 AM, Robert LaJeunesse
rlajeune...@sbcglobal.net wrote:
A couple tricks I've learned along the way: 1) If using a switching supply
is required to
A popular solution down under is to use a 555 timer driving a charge pump to
generate negative rails from a single positive supply.
Example here: http://www.vk2hmc.net/blog/?p=970
Hi all - I'm back :)
--marki
-Original Message-
From: time-nuts-boun...@febo.com
Having dismantled a good number of the wireless locator units
that these Trimble Thunderbolts were in I can tell you that the
DC-DC power supply in these units did not have a -12VDC output
but put out -7VDC instead.
If I recall the DAC output voltage of almost all the T-bolts I tested
was
