Chris wrote:
Just practical question.. How would one measure noise at this
level? If I were evaluate this what would I need?
Generally, one starts with an extremely low noise amplifier. Note
that isolating the very low frequency AC components from the DC
component is a substantial difficul
ftrag von Charles P.
> Steinmetz
> Gesendet: Freitag, 1. Februar 2013 18:35
> An: Discussion of precise time and frequency measurement
> Betreff: Re: [time-nuts] Low noise power supplies?
>
>
> Joe wrote:
>
> >Back when I was in product engineering there was a VCO desi
1 Feb 2013 13:39:14
To: Discussion of precise time and frequency measurement
Reply-To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Low noise power supplies?
Well, I stand corrected. Weren't the TM 500 instruments marketed as low
cost?
Regards.
to the fun with wood group send a blank email to
funwithwood-subscr...@yahoogroups.com
- Original Message -
From: "John Miles"
To: "'Discussion of precise time and frequency measurement'"
Sent: Friday, February 01, 2013 12:03 AM
Subject: Re: [time-
be to the fun with wood group send a blank email to
funwithwood-subscr...@yahoogroups.com
- Original Message -
From: "David"
To: "Discussion of precise time and frequency measurement"
Sent: Thursday, January 31, 2013 11:10 PM
Subject: Re: [time-nuts] Low noise power
Sorry, Poul-Henning Kamp, I answered directly
to your mail address, I repost it here...
Il 2013-02-01 18:09 Poul-Henning Kamp ha scritto:
Content-Type: text/plain; charset=ISO-8859-1
In message <2bf4f4e8c8207ae0f94a7e1a1e63c...@quipo.it>, Fabio Eboli
writes:
Il 2013-01-31 06:42 Mark
Joe wrote:
Back when I was in product engineering there was a VCO design that
used a "superfilter" circuit. It consisted of a pass transistor and
a filter cap from base to ground. The gain of the transistor
multiplied the effective capacitance. I have not seen this configuration since.
They
Content-Type: text/plain; charset=ISO-8859-1
In message <2bf4f4e8c8207ae0f94a7e1a1e63c...@quipo.it>, Fabio Eboli writes:
>Il 2013-01-31 06:42 Mark Sims ha scritto:
>> A123 20Ah LiFePO4 cells have an internal resistance in the milliohm
>> range. [...]
Low internal resistance in batteries
age, it is reasonable stable.
-Original Message-
From: "John Miles"
Sender: time-nuts-boun...@febo.com
Date: Fri, 1 Feb 2013 01:30:24
To: 'Discussion of precise time and frequency measurement'
Reply-To: Discussion of precise time and frequency measurement
Subj
] On
Behalf Of M. Simon
Sent: Friday, February 01, 2013 9:11 AM
To: time-nuts@febo.com; jleik...@leikhim.com
Subject: [time-nuts] Low noise power supplies?
Joe,
I'm using that in my low power (150ma) supplies. I add a zener to the base
(darlington) circuit for pre-regulation. Since I'm do
d to order parts) I will
publish.
Simon
Message: 6
Date: Thu, 31 Jan 2013 15:39:02 -0500
From: Joe Leikhim
To: time-nuts@febo.com
Subject: [time-nuts] Low noise power supplies?
Message-ID: <510ad666.8090...@leikhim.com>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Ba
Hello, interesting discussion about noise.
It's all way over my knowledge, so my contribution
to discussion maybe is only noise :)
Re batteries I agree with Mark, see below:
Il 2013-01-31 06:42 Mark Sims ha scritto:
A123 20Ah LiFePO4 cells have an internal resistance in the milliohm
range. The
ht-
> Von: time-nuts-boun...@febo.com
> [mailto:time-nuts-boun...@febo.com] Im Auftrag von Bob Camp
> Gesendet: Freitag, 1. Februar 2013 13:38
> An: Discussion of precise time and frequency measurement
> Betreff: Re: [time-nuts] Low noise power supplies?
>
>
> Hi
>
Hi
The circuit I described, is (as stated) quiet down to 100 Hz. It's 3 db
bandwidth is well below 10 Hz with the 47 uF cap. If you need it quiet down to
10 Hz or 0.1 Hz, you will need to buy a few more caps. It's still not
rocket science.
For most OCXO or atomic standard testing appli
f the day.
Thanks,
Burt, K6OQK
> Subject: Re: [time-nuts] Low noise power supplies?
>
> A non-standard but repeatable way to measure power supply noise is to use a
> Transmission Impairment Measuring Set (TIMS) such as the HP3945(6)A or 3551
> (2)A. These were intended for use i
Bob Camp, Thursday, January 31 11:36 AM (Local NY time):
((...snip...))
> With a good enough voltmeter you could carry the analogy one step further
> and compute an ADEV like number on the output voltage. I suspect that's
> carrying things a bit far.
No, I disagree. That's not carrying things near
> Are 4 and 5 regulated? Or is the zener picked to compensate for the VBE
> drops?
>
> Any of these circuits where the output transistor is in an emitter
> follower configuration will have its noise effected by the load current,
> since that current directly effects the output transistor
transcond
nuts-
boun...@febo.com] On Behalf Of Richard (Rick) Karlquist
Sent: Wednesday, January 30, 2013 6:17 PM
To: Discussion of precise time and frequency measurement
Subject: [time-nuts] Low noise power supplies?
I know this topic has been discussed in the past on the list, but
a colleague is asking if th
I have seen it used in a couple of Tektronix TM500 instruments but the
purpose may have been to generate a lower voltage power supply rail
instead of noise reduction. Tektronix often added LC sections on
their switching power supply outputs and distributed smaller LC
sections to prevent coupling b
od group send a blank email to
funwithwood-subscr...@yahoogroups.com
- Original Message -
From: "Joe Leikhim"
To:
Sent: Thursday, January 31, 2013 2:39 PM
Subject: [time-nuts] Low noise power supplies?
Back when I was in product engineering there was a VCO design that used a
One more thought: Many oscillators have internal regulators that are not
nearly as good as what you can build. No sense using an external supply
with 5 nV per root Hz noise density if it will be re-regulated inside
the oscillator by a circuit that has a noise density of 250 nV per root Hz.
Bes
Back when I was in product engineering there was a VCO design that used
a "superfilter" circuit. It consisted of a pass transistor and a filter
cap from base to ground. The gain of the transistor multiplied the
effective capacitance. I have not seen this configuration since.
--
Joe Leikhim
L
Bob wrote:
An AD 797, a couple of metal film resistors, and a fairly large (say
47 uf) plastic cap work pretty well.
The band from 10 Hz down to 0.1 or 0.01 Hz is generally important
when testing oscillators. To keep the 797 input noise density below
a few nV per root Hz, the terminations m
Hi
If you are driving a spectrum analyzer, the 10,000X mentioned in the app note
simply is not needed. A gain of 10X or less will get you to below 2 nv /
sqrt(Hz) at 100 Hz and beyond. A 10 Hz blocking cap does not need to be a "24
hours to stabilize" device. An AD 797, a couple of metal film
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of saidj...@aol.com
Sent: Thursday, January 31, 2013 3:58 PM
To: time-nuts@febo.com; les...@veenstras.com
Subject: Re: [time-nuts] Low noise power supplies?
Not sure if anyone posted this here yet, but Abracom h
Charles,
thanks for posting. That is the LTC application note I had in mind.
And here is Bruce's contribution to low noise PS design and measurement:
http://www.ko4bb.com/~bruce/LowNoisePowerSupplies.html
Don't miss to scroll fully down. There is a link to an IEEE paper
discussing chemical ba
tvb wrote:
I'll answer the question with anther question -- how does one
properly measure power supply noise? Does it boil down to a single
number, a couple of key numbers, or is it a plot, or several plots?
There are a number of "standard" ways, some of which have been
mentioned by others,
Content-Type: text/plain; charset=ISO-8859-1
In message , "Tom Van Baak" writes:
>We have rigorous ways to compare and report oscillator performance;
>both as numbers and as plots. Is there something equivalent for
>power supplies?
Phase Noise measured on a 0Hz carrier ?
If you want the
om: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Tom Van Baak
Sent: Thursday, January 31, 2013 9:43 AM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Low noise power supplies?
Hi Rick,
I'll answer the question with anther question --
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of saidj...@aol.com
Sent: Thursday, January 31, 2013 3:58 PM
To: time-nuts@febo.com; les...@veenstras.com
Subject: Re: [time-nuts] Low noise power supplies?
Not sure if anyone posted this here yet, but Abracom has a
-boun...@febo.com] On
> Behalf Of Richard (Rick) Karlquist
> Sent: Wednesday, January 30, 2013 9:17 PM
> To: Discussion of precise time and frequency measurement
> Subject: [time-nuts] Low noise power supplies?
>
>
> I know this topic has been discussed in the past on the list,
s,
Burt, K6OQK
Subject: Re: [time-nuts] Low noise power supplies?
A non-standard but repeatable way to measure power supply noise is
to use a Transmission Impairment Measuring Set (TIMS) such as the
HP3945(6)A or 3551
(2)A. These were intended for use in pairs to assess analog
telephone lines f
Oops,
that should be HP4945(6)A not 3945
Robert.
From: Robert Atkinson
To: Discussion of precise time and frequency measurement
Sent: Thursday, 31 January 2013, 18:46
Subject: Re: [time-nuts] Low noise power supplies?
A non-standard but repeatable way to
: Thursday, 31 January 2013, 18:02
Subject: Re: [time-nuts] Low noise power supplies?
Hi
A very common way to check one is to use the HP 3561 off of the old 3048
phase noise test set. With a simple op amp based preamp you can easily get
down below 3 nv / sqrt(Hz). With more exotic amps you can get
On 31 January 2013 17:11, John Ackermann N8UR wrote:
> And this (very interesting) thread brings up the question of measurement
> methods. Some time ago I searched around and didn't find much on a standard
> way to measure noise on low voltage DC supplies.
>
> John
Did you try the volt-nuts mail
ssage-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Burt I. Weiner
Sent: Thursday, January 31, 2013 12:08 PM
To: time-nuts@febo.com
Subject: [time-nuts] Low noise power supplies?
Gang,
I'm following this thread with great interest, but, just for my own
On 31.01.2013 09:05, Adrian wrote:
Rick,
the E3610A is really clean.
The discussion is interesting, but the original question did ask about
off the shelf so I have been watching for any mention of HP/Agilent
precision power supplies. The E3610A specification says 200 uVrms, 2mv
pp ripple
time-nuts-boun...@febo.com] On
Behalf Of Tom Van Baak
Sent: Thursday, January 31, 2013 9:43 AM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Low noise power supplies?
Hi Rick,
I'll answer the question with anther question -- how does one properly
measure power s
Gang,
I'm following this thread with great interest, but, just for my own
reference, what is considered low power supply noise? Can you give
me some numbers and over what bandwidth?
Thanks,
Burt, K6OQK
Subject: Re: [time-nuts] Low noise power supplies?
Hi
To answe
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Tom Van Baak
Sent: Thursday, January 31, 2013 9:43 AM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Low noise power supplies?
Hi Rick,
I'll answer the question with anther que
On 31 January 2013 04:28, Chris Albertson wrote:
> On Wed, Jan 30, 2013 at 6:16 PM, Richard (Rick) Karlquist
> wrote:
>>
>> I know this topic has been discussed in the past on the list, but
>> a colleague is asking if there are any off the shelf low
>> noise power supplies for testing oscillators
Hi Rick,
I'll answer the question with anther question -- how does one properly measure
power supply noise? Does it boil down to a single number, a couple of key
numbers, or is it a plot, or several plots?
I ask because without some sort of standard test and reporting method it just
becomes a
Rick,
the E3610A is really clean.
If that isn't good enough, there are some audio-related circuits like
the ALWSR.
http://www.andrewweekes.talktalk.net/Manuals/ALWSR_rev2.9_Iss005s.pdf
It's based on a Walt Jung design (Analog Devices).
Here's the man himself with tons of valuable information
If the main concern is about low-frequency noise the LT1763 might be worth
considering for a simple solution, as it is capable of lower noise than the
data sheet shows. With a bypass capacitor (Cbyp) fitted, the noise floor is
~30nV/rtHz. Although the data sheet only recommends up to 10nF for Cb
-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Charles P. Steinmetz
Sent: Thursday, January 31, 2013 5:33 AM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Low noise power supplies?
Lester wrote:
>For a regulated power sup
Am 31.01.2013 05:28, schrieb Chris Albertson:
For once the "best" is also cheap: Batteries.
But not all batteries are the same. You want one with low internal
resistance, so a lead acid flooded battery will be the best.
Fred Walls & Co have done tests on batteries. The article is
somewhere o
Am 31.01.2013 03:16, schrieb Richard (Rick) Karlquist:
I know this topic has been discussed in the past on the list, but
a colleague is asking if there are any off the shelf low
noise power supplies for testing oscillators. Something
The E5052B signal source analyzer has low noise power
and c
Lester wrote:
For a regulated power supply, make one using a 723. The 723 has
far lower noise out than the monolithic regulators.
If you are willing to design your own regulator using a 723, you may
as well use a few more parts to get a much better result. Neither
the internal reference nor
PTAT == Proportional To Absolute Temperature
Dave
___
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.
On 1/31/2013 12:20 AM, Bruce Griffiths wrote:
With some care its possible to make the emitter current of the shunt
transistor approximately PTAT so that, at least for small signals the
temperature dependence of the rejection is reduced significantly.
Sorry, what does PTAT mean? I'm not familia
Poul-Henning Kamp wrote:
Content-Type: text/plain; charset=ISO-8859-1
In message, Tom Knox writes:
Starting with a hp supply this finesse regulator will really clean
up the output. http://www.wenzel.com/documents/finesse.html
I've played with that, and it can do impressive th
I've measured AA nicad impedance at a few kHz, but it was years ago. My
recollection is it was in tens of milliohms.
ESR does have a frequency dependency. In the same time frame, I was
trying to find a simple non-instrusive way to detect alkaline cells
versus nicads. The key was in impedance v
Content-Type: text/plain; charset=ISO-8859-1
In message , Tom Knox writes:
>
>Starting with a hp supply this finesse regulator will really clean
>up the output. http://www.wenzel.com/documents/finesse.html
I've played with that, and it can do impressive things.
However, to big caveats:
Content-Type: text/plain; charset=ISO-8859-1
In message , Mark Sims writes:
>
>A123 20Ah LiFePO4 cells have an internal resistance in the milliohm
>range. Their M1 26650 format cells are around 8 milliohms. Most
>high capacity (>3000 mAh) 18650 style lithium cells are around 10-15
>milli
Rick,
I'm just finishing up some low noise supplies that use the TPSA49xx regulator.
The AC input is a 12 AC wall wart and it uses zener/darlington pre-regulators.
+5 and +3.3 V @ 150 ma each. I have the boards in hand and am ordering parts.
The voltages are tweakable. i.e. 5.1V and 3.4V for in
Hi Rick;
Starting with a hp supply this finesse regulator will really clean up the
output. http://www.wenzel.com/documents/finesse.html
Best Wishes;
Thomas Knox
> Date: Wed, 30 Jan 2013 18:16:46 -0800
> From: rich...@karlquist.com
> To: time-nuts@febo.com
> Subject: [time-nuts] Low
YUP,
The C-130 aircraft uses larger than car battery size wet NiCd to fire up the
Genset that is used to start the Tubo-prop jet engines. Definitely has lower
resistance then the Lead-Acid wet cell.
BillWB6BNQ
Arthur Dent wrote:
> >But the only NiCd I know about are the AA sized ones.
>
>
>But the only NiCd I know about are the AA sized ones.
I have some of the wet NiCd batteries that are capable of
putting out 200A continuously. I'm assuming the internal
resistance is pretty low. ;-)
Arthur
___
time-nuts mailing list -- time-nuts@febo
A123 20Ah LiFePO4 cells have an internal resistance in the milliohm range.
Their M1 26650 format cells are around 8 milliohms. Most high capacity (>3000
mAh) 18650 style lithium cells are around 10-15 milliohms.
-nuts] Low noise power supplies?
I know this topic has been discussed in the past on the list, but a
colleague is asking if there are any off the shelf low noise power supplies
for testing oscillators. Something a cut above an HP "brick" lab power
supply etc. They are hoping to avoid
On Wed, Jan 30, 2013 at 9:05 PM, Jim Lux wrote:
> On 1/30/13 8:28 PM, Chris Albertson wrote:
>
>> For once the "best" is also cheap: Batteries.
>>
>> But not all batteries are the same. You want one with low internal
>> resistance, so a lead acid flooded battery will be the best.
>
>
> Most NiCd
On 1/30/13 8:28 PM, Chris Albertson wrote:
For once the "best" is also cheap: Batteries.
But not all batteries are the same. You want one with low internal
resistance, so a lead acid flooded battery will be the best.
Most NiCd have very low internal resistance.. much lower than lead acid.
On Wed, Jan 30, 2013 at 6:16 PM, Richard (Rick) Karlquist
wrote:
>
> I know this topic has been discussed in the past on the list, but
> a colleague is asking if there are any off the shelf low
> noise power supplies for testing oscillators. Something
> a cut above an HP "brick" lab power supply
: Wednesday, January 30, 2013 9:17 PM
To: Discussion of precise time and frequency measurement
Subject: [time-nuts] Low noise power supplies?
I know this topic has been discussed in the past on the list, but a
colleague is asking if there are any off the shelf low noise power supplies
for testing
I know this topic has been discussed in the past on the list, but
a colleague is asking if there are any off the shelf low
noise power supplies for testing oscillators. Something
a cut above an HP "brick" lab power supply etc. They are hoping
to avoid having to homebrew a power conditioning cir
Were getting of off the original thread about Electrolytics versus other
caps a bit..
>A switcher at 2.2MHz does not have single frequency spikes in its power
>spectrum, but a rather wideband distribution.
Yes, that's Fourier 101 basics.
But what matters to Time nuts is if the switcher is
To: time-nuts@febo.com
Subject: Re: [time-nuts] Low noise power supplies - dont' use Electrolytics
Hi Attila,
I like >2MHz switchers because they use small components (inductors and
capacitors) and are easier to filter out at our usual frequencies of
interest.
The LT3502A for examp
Hi Attila,
I like >2MHz switchers because they use small components (inductors and
capacitors) and are easier to filter out at our usual frequencies of interest.
The LT3502A for example works at 2.2MHz, which gives harmonics at 8.8MHz
and 11MHz, far enough away from 10.0MHz to avoid beatin
On Mon, 28 Nov 2011 16:16:58 -0500 (EST)
saidj...@aol.com wrote:
> Use foil caps to avoid vibration-microphonics. Very expensive, but hey you
> get what you pay for. Use Tantalum caps if bulk bypassing is needed, using
> multiple 100uF units if necessary. The design is not right if you need mo
Hi guys,
yes, Electrolytics, the OS-CON are specified at an internal +20C
temperature rise when running at rated AC current, and that's probably when
they are
brand-new and have all of their initial capacitance. Temperature rise in
high current apps will probably increase as the part ages
On Mon, 28 Nov 2011 01:05:22 -0800
gary wrote:
> Ceramic caps can be microphonic. Just something to be on the look out.
> Not so much with leaded ceramics, but more of a problem with surface mounts.
Ceramic caps have a lot of other problems too, like capacitance
derating on increasing voltage.
Ceramic caps can be microphonic. Just something to be on the look out.
Not so much with leaded ceramics, but more of a problem with surface mounts.
Tantalums are prone to overvoltage failure. Best to really overspec them
regarding voltage.
Note that some LDOs are not stable with really low ES
On Fri, 25 Nov 2011 22:25:37 -0800
Chris Albertson wrote:
> One question: How does one avoid using electrolytic caps if you need
> (say) 1,000uF or even 100uF. Those would be some mighty big film
> caps.
I think, aluminium electrolytics are meant, as these have a lot of
"wear" and can die.
I molt them in a high-power charge-pump. The same with WIMA MKS.
At normal usage they will last forever and work even at low temperature
whereas normal Al caps won't.
- Henry
gary schrieb:
At sane temperatures, OSCONs are very good. Who runs their gear hot
enough to boil water?
http://edc.
On 11/26/11 11:13 AM, Chris Albertson wrote:
On Fri, Nov 25, 2011 at 10:36 PM, Raj wrote:
How about this way: Amplifying capacitance.. (Base/Ground cap * Beta)
http://sound.westhost.com/project15.htm
The above actually uses several quite large electrolytic. It is a
good example of why you
On Fri, Nov 25, 2011 at 10:36 PM, Raj wrote:
> How about this way: Amplifying capacitance.. (Base/Ground cap * Beta)
>
> http://sound.westhost.com/project15.htm
>
The above actually uses several quite large electrolytic. It is a
good example of why you NEED to use them.
Maybe someone can post
Off topic: Actually, you can make almost anything withstand almost
any conditions TEMPORARILY - it depends on the packaging too. If you
wrap a circuit that can work at 100 deg C in a water jacket wrapped
in high temperature insulation, you can keep it going until most of
the water has boiled aw
On Sat, Nov 26, 2011 at 2:13 AM, gary wrote:
> At sane temperatures, OSCONs are very good. Who runs their gear hot enough
> to boil water?
National Fire Protection Agency (NFPA) 2007 edition of their design
regulations state the electronics worn by Fire Fighters must work at
500'F for five minute
In message
, Chris Albertson writes:
>One question: How does one avoid using electrolytic caps if you need
>(say) 1,000uF or even 100uF. Those would be some mighty big film caps.
One detail, often overlooked, is that electrolytics seldom are
dimensioned very precisely, mostly because they do
At sane temperatures, OSCONs are very good. Who runs their gear hot
enough to boil water?
http://edc.sanyo.com/pdf/e_oscon.pdf
___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-
To second the older electronics:
I maintain nearly 100 analytical instruments. The old designs(1970-late
80's) are almost all electrolytic caps and none of the caps have ever
failed. When I do find a bad cap it's always in a modern design. A high
frequency switcher with under rated caps. When i sa
How about this way: Amplifying capacitance.. (Base/Ground cap * Beta)
http://sound.westhost.com/project15.htm
>One question: How does one avoid using electrolytic caps if you need
>(say) 1,000uF or even 100uF. Those would be some mighty big film
>caps.
__
Many of us have seen electronic equipment last longer then one year.
Some of use even have still working antiques with old eletro caps.
Those short lifetimes assume a worse case, usually with a very high
ripple current. IOf you can reduce the ripple the MTBF goes up.
One question: How does one
Electrolytic caps have an extremely poor lifetime (MTBF). Sanyo on their
website state "50K Hrs at 50C".
This means only 6250 MTBF hours at 80C for one single cap. MTBF gets worse
the more caps are being used of course. I have seen some Panasonic
electrolytics state only 2000 hours MTBF at
On Thu, 24 Nov 2011 11:45:05 -0700
Kevin Rosenberg wrote:
> > 78xx Regulators are quite noisy. You can use them to filter the
> > noise of a cheap DC/DC converter, but i wouldnt use them feed
> > high precision electronics. There are a lot better designs these days.
>
> Would you mind recommendi
On Nov 24, 2011, at 4:46 PM, Bob Camp wrote:
> The Linear LT1764 is reasonably quiet / high current / low dropout. Don't
> count on getting all three at once.
Thanks, Bob!
Kevin
___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to h
The LTC datasheet "crows" about low current in dropout. Yeah, it's worth
crowing about since not all chip use what is called a "sat catcher"
circuit. High current in dropout with PNP pass devices can be a problem.
I've seen Micrel regulators that are horrible in dropout. The sat
catcher is yet
Hi
The Linear LT1764 is reasonably quiet / high current / low dropout. Don't count
on getting all three at once.
Bob
On Nov 24, 2011, at 12:45 PM, Kevin Rosenberg wrote:
>> 78xx Regulators are quite noisy. You can use them to filter the
>> noise of a cheap DC/DC converter, but i wouldnt use
Hi All
,
I find it interesting that this subject came up just as I was looking
into cleaning up some of my supplies that power my RB's.
Anyway
I just bought two of these to play with
http://cgi.ebay.com.au/ws/eBayISAPI.dll?ViewItem&item=130605436528
and they're based on this device...
h
se high accuracy
> regulators can't handle low ESR caps on the output.
> -Original Message-
> From: Joe Gwinn
> Sender: time-nuts-boun...@febo.com
> Date: Thu, 24 Nov 2011 10:14:35
> To:
> Reply-To: Discussion of precise time and frequency measurement
>
ecise time and frequency measurement
Subject: Re: [time-nuts] Low noise power supplies for time nuts circuitry
At 2:28 PM + 11/24/11, time-nuts-requ...@febo.com wrote:
>Message: 3
>Date: Thu, 24 Nov 2011 13:22:38 +0100
>From: Attila Kinali
>To: Discussion of precise time and
On Nov 23, 2011, at 5:50 AM, Chuck Forsberg WA7KGX N2469R wrote:
> How sensitive are each of a Thunderbolt's 3 supplies to noise?
This doesn't break down the sensitivities to noise, but Tom shows
a range of TBolt output noise for different 3 voltage power supplies:
http://www.leapsecond.com/pages/
> 78xx Regulators are quite noisy. You can use them to filter the
> noise of a cheap DC/DC converter, but i wouldnt use them feed
> high precision electronics. There are a lot better designs these days.
Hi Attila,
Would you mind recommending some low-noise regulators? Perhaps for
both low and hig
At 2:28 PM + 11/24/11, time-nuts-requ...@febo.com wrote:
Message: 3
Date: Thu, 24 Nov 2011 13:22:38 +0100
From: Attila Kinali
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Low noise power supplies for time nuts
circuitry
Message-ID
measurement
Subject: Re: [time-nuts] Low noise power supplies for time nuts circuitry
How well would a pair of cascaded 3 terminal regulators do - say a 7815
feeding a 7812.
How sensitive are each of a Thunderbolt's 3 supplies to noise?
On 11/23/2011 04:13 AM, Attila Kinali wrote:
>
On Wed, 23 Nov 2011 04:50:49 -0800
Chuck Forsberg WA7KGX N2469R wrote:
> How well would a pair of cascaded 3 terminal regulators do - say a 7815
> feeding a 7812.
78xx Regulators are quite noisy. You can use them to filter the
noise of a cheap DC/DC converter, but i wouldnt use them feed
high p
How well would a pair of cascaded 3 terminal regulators do - say a 7815
feeding a 7812.
How sensitive are each of a Thunderbolt's 3 supplies to noise?
On 11/23/2011 04:13 AM, Attila Kinali wrote:
On Tue, 22 Nov 2011 12:38:43 -0500
Bob Camp wrote:
There are a couple of circuits (low noise op-
On Tue, 22 Nov 2011 12:38:43 -0500
Bob Camp wrote:
>
> There are a couple of circuits (low noise op-amp based)
> that can generate lower noise than what he's shown.
What circuits would that be?
Attila Kinali
--
The trouble with you, Shev, is you don't say anything unt
li...@lazygranch.com schrieb:
The bozos at Broadcom have actually patented using shunt regulation in their chips. Good luck enforcing that patent.
Must be a joke or misunderstanding.
Look for example in the datasheet of TCA440. A really old IC. In the
internal circuit displayed is a diode shu
Subject: [time-nuts] Low noise power supplies for time nuts circuitry
Sent: Nov 22, 2011 2:17 PM
The shunt regulator also serves to isolate load current fluctuations
from the main supply, since it makes it appear as a constant
resistance, current, or power load, depending on the design. This can
1 - 100 of 113 matches
Mail list logo