I would recommend dumping that DC-DC converter and going with a simple
3-terminal regulator (or at least adding an option for it). It seems it would
be a lot cheaper and easier for people to source the parts for it.
_
I put my circuit board layout (Eagle .BRD file) for Warren Sarkison's outer
oven controller for the HP-10811 double oven oscillator onto OSHPARK.COM's
shared projects. You can order boards from OSHPARK or download the .BRD file
and send it to your favorite board maker.
https://oshpark.com/sha
Dan,
Nice.
Ideas for the next go around
+ Add a 10 MHz in circuit to replace or override the TCXO. , this is
Time-Nuts you know :-)
+ The SPI could be used as the 2nd I/O port
And if one wants to play more the this part or other pics search on
Google for "Curiosity Board by Microchip"
-pete
Hi all,
A few months ago someone on the list made mention of the PIC 16F1619,
prompting me to order a few to check out. It's an interesting little chip
with some nice peripherals. I decided to do a mains frequency monitor
project using it. The project is not quite complete, but you can read about
National's discrete products databook includes rough descriptions of
the various processes, die shots showing geometry, and lists which
transistors are fabricated on which process.
On Sun, 19 Jun 2016 22:25:28 +, you wrote:
>Once upon a time I came across a document from National Semiconducto
On Sunday, June 19, 2016 07:23:09 PM Attila Kinali wrote:
> Good evening,
>
> I have recently been looking into BJT's and their switching properties.
> Because a time-to-amplitude converter does similar things as I would like
> to, I have been looking in what people do with those. First thing that
>Why do people use general purpose transistors in these places, even
>though RF transistors definitly improve switching behaviour?
Commercial designs do use RF transistors but only old ones are
documented.
The Tektronix 7A11 uses 2 GHz PNPs and 1 GHz NPNs but its design is
unusual since it can in
Once upon a time I came across a document from National Semiconductor that
talked about their transistor product line. At the time they made less than
100 different transistor dies... but sold them under 10,000+ different part
numbers.Some were just packaging variations. Maybe some select
Hi
What you have is an SC cut OCXO that has an incorrectly tuned trap circuit in
it (or
a defective crystal). Of the two I’d bet on the trap. It’s firing up on the
wrong mode and
staying there. It switches back and forth due to interaction between the
limiter stage
and the trap circuit. Ideall
Most probably this OCXO incorporazes an SC-cut crystal.Due to insufficient
design it sometimes starts at the so-called B-mode which typically is some 9%
above the desired C-mode. The motional resistance is abot the same, someimes
even slightly lower than the resistanxe of the C-mode. It needs a
On 6/19/16 10:23 AM, Attila Kinali wrote:
Good evening,
I have recently been looking into BJT's and their switching properties.
Because a time-to-amplitude converter does similar things as I would like to,
I have been looking in what people do with those. First thing that strikes
me as kind of o
Hi
I am also using an E4406A to measure phase noise with john miles program-works
great,but have been thinking if it would make any difference using an ultra low
noise 10Mhz external reference for the E4406A?Have any of you tried this?
There are some interesting information about the E4406A at e
Has anyone come across oscillators outputting the incorrect frequency when
powered up. The frequency that is outputted reads 10.8 Mhz, and falls a few HZ
as the ocxo warms up. The frequency is stable, even when measured over the
course of many hours. It is a repeatable issue, when the ocxo
Hi
Leakage
Bob
> On Jun 19, 2016, at 1:23 PM, Attila Kinali wrote:
>
> Good evening,
>
> I have recently been looking into BJT's and their switching properties.
> Because a time-to-amplitude converter does similar things as I would like to,
> I have been looking in what people do with those.
A while back I posted a request for info on this box. Nothing was
forthcoming,
so I thought I would ask again.
This box has one input (10 MHz) and three outputs (72.5 MHz, 725 MHz and
7.975 GHz).
>From my experimenting with it, it looks like I can lock the three outputs to
a 10 MHz
sig
Good evening,
I have recently been looking into BJT's and their switching properties.
Because a time-to-amplitude converter does similar things as I would like to,
I have been looking in what people do with those. First thing that strikes
me as kind of odd is that almost all designs I have seen us
In message , Tom Knox writes:
>If we do not receive your acknowledgement, Microsemi will keep
>your order in our backlog, and ship when we have implemented a
>solution that allows us to meet the RoHS criteria and apply the CE
>mark and label."
>
>
>Not really any details onnthe issue.
Wh
Hi
The key sentence does appear to be the last one in the email they sent. There
are a lot of ways
to trip over the ROHS stuff. The guessing game contest now does turn into a
“pick a part” exercise.
There are an enormous number of mistakes that somebody / somewhere in the
supply chain could
ha
On 6/18/16 10:41 PM, John Miles wrote:
On 6/18/16 6:17 PM, Tom Knox wrote:
Does anyone have any insight as to why Microsemi has stopped shipping
3120A Phase Noise test sets beside that they are not to spec?
They're shipping them.. I got quoted a 12 week delivery in April, $9k
for the box, a
>From an earlier post:
"E4406A and feeding HF signals directly to the ADC"
Has anyone here done that ?
Thanks
Dave
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and follo
It almost sounds like something has been found not to be ROHS compliant.Could
be as simple as the alodined (conventional process uses hexavalent chromium )
case or perhaps a non ROHS part was used.
Bruce
On Sunday, 19 June 2016 8:02 PM, John Miles wrote:
> On 6/18/16 6:17 PM, Tom Knox
Hi All;
This was the email a friend recently received.
The 3120A product is currently on hold until Microsemi implements a solution.
If you would like for Microsemi to sell this 3120A product to you and process
your purchase order -Sales Order notwithstanding that these products do not
meet p
> On 6/18/16 6:17 PM, Tom Knox wrote:
> > Does anyone have any insight as to why Microsemi has stopped shipping
> 3120A Phase Noise test sets beside that they are not to spec?
> >
> They're shipping them.. I got quoted a 12 week delivery in April, $9k
> for the box, about $12k-15k for the software
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