HP 103A from a swap meet
https://goo.gl/photos/S5RNSvFigrm8TSeY9
___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
h oooh I want a set. ! any idea how many gauss?
Dave
On 4/8/2017 8:31 PM, cdel...@juno.com wrote:
Here are some magnets from an HP Cesium tube.
It shows one pair of state selection magnets, (there are two pairs in
each tube), and the magnet for the ion pump.
Cheers,
Corby
A friend asked me a while ago why the FTS Cesium tubes were so light.
Since they were designed from the beginning to fit in a 5.25" high
chassis that cut quite a bit of the weight.
However a large amount of weight was saved by using a Ramsey cavity that
was not milled from a massive block of co
David wrote:
I mentioned this in connection with some manufacturers using gold
doping in transistors which would not normally be expected to have
gold doping. So you end up with a bunch of lessor named 2N3904s which
meet the 2N3904 specifications but are useless if you were looking for
low leak
https://www.febo.com/pipermail/time-nuts/2017-April/thread.html
We performed an experiment with our working HP5061B which had been
cold overnight. This was to better determine lock time from cold
ovens. We found that the crystal oscillator oven heats up about twice
as fast as does the cesium ove
David wrote:
So gold doping does work with PNP devices. Previously when I brought
it up, I was told gold doping only applied to NPN devices leading to
my confusion.
Since I posted, I dug through my books and found a few more references
on point:
A couple of textbooks say commercial PNP fas
Am 08.04.2017 um 17:52 schrieb David:
If they are not being tested, then where is the maximum specified
leakage number coming from? For a small signal bipolar transistor it
will typically be 25nA, 50nA, or 100nA, but the InterFET datasheet (1)
shows 10pA maximum and 1pA maximum for the A versio
The Siliconix PAD1 at 1pA and 0.8pF is still available :
http://www.micross.com/pdf/LSM_PAD1_TO-72.pdf
On Sat, Apr 8, 2017 at 4:52 PM, David wrote:
> On Thu, 6 Apr 2017 22:23:43 -0400, you wrote:
>
> >David wrote:
> >
> >> I know one thing to watch out for if you are looking for low
> >> leaka
You need to be careful how you paint the package black. My first electronics
job was in a place that made, among other things, mass spectrometers. We made
very high input impedance electrometers for the mass specs using TO-5 can
mosfet transistors. One batch was found to be very photo sensiti
On Thu, 6 Apr 2017 22:23:43 -0400, you wrote:
>David wrote:
>
>> I know one thing to watch out for if you are looking for low
>> leakage is gold doping
>
>Anything that increases carrier mobility increases leakage current (all
>else equal -- i.e., for each particular device geometry). This acco
On Fri, 7 Apr 2017 01:06:17 -0400, you wrote:
>Another thing to watch out for if you need very low leakage, is if the
>package is transparent. All junctions are photodiodes.
>
>Maybe it's less of a problem now with SMTs, than it was with glass body
>diodes or translucent transistor packages.
>
>A
On Fri, 7 Apr 2017 04:09:38 -0400, you wrote:
>David wrote:
>
>>> what doping is used for PNP RF transistors and saturated switches
>>> if it is not gold? Does it also increase leakage?
>
>I replied:
>
>> Gold doping doesn't affect the speed of BJTs in the active region very
>> much -- its purpos
Mike you may have missed it in the thread. I made a mistake its not the
cme8000 chip.
Thats a classic am decoder. *You want the ES100*. Thats a true wwvb bpsk
decoder. Contact La Crosse and ask if they have a model.
Regards
Paul
WB8TSL
On Fri, Apr 7, 2017 at 1:18 PM, Mike Seguin
wrote:
> Does an
13 matches
Mail list logo