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Don Collie wrote:
> Can`t it be done with just 3 resistors?
> Cheers,.Don C.
>
>
No, you still need a stable negative voltage source.
In any case the collective decision appears to
;Discussion of precise time and frequency
measurement"
Sent: Saturday, November 03, 2007 10:19 PM
Subject: Re: [time-nuts] Fury Interface Board: How about TI OPA277?
> [EMAIL PROTECTED] wrote:
>>
>> In a message dated 11/2/2007 17:51:33 Pacific Daylight Time,
>> [E
Hi Bruce:
The SC 10 can be configured with it's EFC voltage range the same as about any
possible oscillator. The PCB just has optional parts to allow that.
http://www.thinksrs.com/products/SC10.htm
--- from the above web page
Tuning
Mech. tuning range >±3 Hz
EFC range and slope
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Bruce Griffiths wrote:
> I have datasheets (or equivalent thereof) for
> HP 10543
> HP10544A
> HP10544B/C
> HP10811A/B
> HP E1938A
> OSA 8600
> OSA 8607
> SRS SC 10
> FTS1200
> Symmetricom 1000B
>
> I will setup a spreadsheet fo
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[EMAIL PROTECTED] wrote:
> (Using an input voltage lower than your own supply rail seems odd.)
>
Not really, for example dc grounding the varicap cathode means that one
doesn't need to include a low noise, low drift referen
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[EMAIL PROTECTED] wrote:
> Yeah, it gets a bit heated. Since you have the data sheets and all,
> could you spare us a bit of work and summarize, for each OCXO:
> - What EFC and power voltages it needs.
> (Using an input volta
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xaos wrote:
> Hello everyone,
>
> Needless to say, but I have also been following this discussion closely.
>
> First, I must confess, I started this project without making clear
> what my requirements were.
>
> Personally, I kne
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In the US, I'm not sure it's always legal for you to void the overall
warranty on an item due to unrelated changes made by the customer. Could be
a good idea to check with an attorney before enforcing those terms.
-- john, KE5
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In a message dated 11/3/2007 12:07:18 Pacific Daylight Time,
[EMAIL PROTECTED] writes:
>Maybe you should consider "fair reconfigurations" in a defined list as
>tolerated without voiding the warranty.
>I.e. you define a l
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From: [EMAIL PROTECTED]
Subject: Re: [time-nuts] Fury Interface Board: How about TI OPA277?
Date: Sat, 3 Nov 2007 14:47:38 EDT
Message-ID: <[EMAIL PROTECTED]>
Said,
> that's a good point. The Fury can be turn
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In a message dated 11/3/2007 06:16:00 Pacific Daylight Time,
[EMAIL PROTECTED] writes:
>3. Said said, that a thermistor should be placed between the Fury OCXO
>VCC and ground. Since I will be
> breaking out these sign
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In a message dated 11/3/2007 02:19:49 Pacific Daylight Time,
[EMAIL PROTECTED] writes:
>Said
>Another consideration is that for 10544A's and similar oscillators which
>are only intended to drive high impedance loads( >=
Yeah, it gets a bit heated. Since you have the data sheets and all,
could you spare us a bit of work and summarize, for each OCXO:
- What EFC and power voltages it needs.
(Using an input voltage lower than your own supply rail seems odd.)
- What EFC voltage stability (uV per day or whatever) is
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Hello everyone,
Needless to say, but I have also been following this discussion closely.
First, I must confess, I started this project without making clear
what my requirements were.
Personally, I knew what I wanted. However,
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[EMAIL PROTECTED] wrote:
>
> In a message dated 11/2/2007 17:51:33 Pacific Daylight Time,
> [EMAIL PROTECTED] writes:
>
>
>>> H'm... and if you really want the full +/-10V range, fitting a regulator
>>> and op-amp into
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Bruce Griffiths wrote:
> [EMAIL PROTECTED] wrote:
>
>>
>> In a message dated 11/2/2007 17:51:33 Pacific Daylight Time,
>> [EMAIL PROTECTED] writes:
>>
>>
>>
H'm... and if you really want the full +/-10V rang
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In a message dated 11/2/2007 17:51:33 Pacific Daylight Time,
[EMAIL PROTECTED] writes:
>> H'm... and if you really want the full +/-10V range, fitting a regulator
>> and op-amp into the 2V of available headroom requires a
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> Even better use a device with built in trimmed resistors.
But they usually only come in decade gains. 1:2 and 1:4 limit
you to only a few devices which may not be suitable on other
specs.
> Try actually reading the OCXO dat
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John Miles wrote:
>>> The Achilles' heel of this technique is the statistical temperature
>>> fluctuations experienced by individual resistors.
>>> ...
>>>
>
> Seems debatable whether it's worth worrying about details lik
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> > The Achilles' heel of this technique is the statistical temperature
> > fluctuations experienced by individual resistors.
> > ...
Seems debatable whether it's worth worrying about details like this when the
EFC signal is ju
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Bruce Griffiths wrote:
> [EMAIL PROTECTED] wrote:
>
One trick I use to get better tracking is to build ratios out of multiples
of a single resistor value.
>>
>>
>>
>>> Can you gu
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Bruce Griffiths wrote:
> [EMAIL PROTECTED] wrote:
>
One trick I use to get better tracking is to build ratios out of multiples
of a single resistor value.
>>
>>
>>
>>> Can you gu
>> One trick I use to get better tracking is to build ratios out of multiples
>> of a single resistor value.
> Can you guarantee this works every time?
Define "guarantee". For a reasonable risk ratio, yes. Resistor
manufacturers don't go out of their way to package resistors from
different ba
A schematic illustrating how one can translate a 0-5v EFC signal to a
-5V to +5V swing for an HP10811A is attached.
For clarity the supply bypass caps have been omitted as have the EFC low
pass filter components.
No precision resistors are required they are all provided on chip.
The AD586 is dep
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David Forbes wrote:
> At 9:09 PM -0600 11/1/07, [EMAIL PROTECTED] wrote:
>
>> It is funny how things you forgot a long time ago have a way of coming back.
>>
>> Case in point. I was just running some simulations on the EFC
>>
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David Forbes wrote:
> At 9:09 PM -0600 11/1/07, [EMAIL PROTECTED] wrote:
>
>> It is funny how things you forgot a long time ago have a way of coming back.
>>
>> Case in point. I was just running some simulations on the EFC
>>
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At 9:09 PM -0600 11/1/07, [EMAIL PROTECTED] wrote:
>It is funny how things you forgot a long time ago have a way of coming back.
>
>Case in point. I was just running some simulations on the EFC
>interface and then I had this ide
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It is funny how things you forgot a long time ago have a way of coming back.
Case in point. I was just running some simulations on the EFC
interface and then I had this idea.
Wouldn't an instrumentation amplifier be the righ
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[EMAIL PROTECTED] wrote:
> Vos is 1 uV/C guaranteed, 0.15 V/C typical. (And you can get a
> high-spec part with the latter guaranteed.) Can take 24 V supply,
> and pull to within 1.5V of the rails over the full temperature ran
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Vos is 1 uV/C guaranteed, 0.15 V/C typical. (And you can get a
high-spec part with the latter guaranteed.) Can take 24 V supply,
and pull to within 1.5V of the rails over the full temperature range,
so can produce +/-10V.
Als
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