I was thinking that I might be reinventing the wheel by designing a
buffer amp. You guys have almost built the entire car! Thanks again
for the ideas. It'll take me a while to get it built and tested.
Ed
Bruce Griffiths wrote:
John Miles wrote:
If it helps I can send you some LTSpice
Hi all,
indeed this is very interesting, can this buffer amplifier be used as
a building block for a distribution amplifier for the 10 MHz signal of
a thunderbolt? I remember having seen on the list a similar version
but with european transistors (like the ubiquitous bc548/bc558?) that
are very
Francesco
Yes, just keep the gain of each stage low and cascade 2 or3 if you need
higher reverse isolation.
Since the input impedance is around 1k (predominantly capacitive) at
10MHz you can drive several in parallel from a 50 ohm source.
If needed you can add a bridged T-coil network at the
Hello Bruce,
On 12/9/09, Bruce Griffiths bruce.griffi...@xtra.co.nz wrote:
Francesco
Yes, just keep the gain of each stage low and cascade 2 or3 if you need
higher reverse isolation.
Since the input impedance is around 1k (predominantly capacitive) at 10MHz
you can drive several in
On Wed, 09 Dec 2009 15:08:15 +1300, you wrote:
Another point is the LTSpice LED model isn't particularly accurate for
simulating the effects of temperature variations.
Does anyone knows of more accurate LTSpice compatible LED models?
The LED model voltage drop increases with temperature even
Francesco
francesco messineo wrote:
Hello Bruce,
On 12/9/09, Bruce Griffithsbruce.griffi...@xtra.co.nz wrote:
Francesco
Yes, just keep the gain of each stage low and cascade 2 or3 if you need
higher reverse isolation.
Since the input impedance is around 1k (predominantly capacitive)
Gerhard Hoffmann wrote:
On Wed, 09 Dec 2009 15:08:15 +1300, you wrote:
Another point is the LTSpice LED model isn't particularly accurate for
simulating the effects of temperature variations.
Does anyone knows of more accurate LTSpice compatible LED models?
The LED model voltage drop
Ed
The attached circuit is for a JFET input transformer feedback amplifier
with a relatively high input impedance at 10MHz along with relatively
low noise and distortion.
A Minicircuits T9-1 should suffice for the transformer.
The major limitation when using these transformeres is that dc
If it helps I can send you some LTSpice schematics so that you can
simulate the circuit for yourself.
The breadboards behave as predicted by the simulations at 10MHz.
John Miles has done some preliminary phase noise measurements on his
version.
The transformers are wound on
John Miles wrote:
If it helps I can send you some LTSpice schematics so that you can
simulate the circuit for yourself.
The breadboards behave as predicted by the simulations at 10MHz.
John Miles has done some preliminary phase noise measurements on his
version.
The transformers are wound
I have a late-model 105B Oscillator that's equipped with a 10811-60109
oscillator. It seems a shame to have that nice 10 MHz source without
having access to it. I was thinking of adding a buffer amp and bringing
out the 10 MHz signal. It shouldn't be too hard, but before I reinvent
the
I have not but agree its not very hard to do. Just depends on the quality of
the buffer amp you want to use and the addition of a connector or two.
On Mon, Dec 7, 2009 at 12:03 PM, Ed Palmer ed_pal...@sasktel.net wrote:
I have a late-model 105B Oscillator that's equipped with a 10811-60109
@febo.com
Subject: [time-nuts] HP 105B Modification
I have a late-model 105B Oscillator that's equipped with a 10811-60109
oscillator. It seems a shame to have that nice 10 MHz source without
having access to it. I was thinking of adding a buffer amp and bringing
out the 10 MHz signal
07, 2009 11:04 AM
To: Time Nuts Mailing List
Subject: [time-nuts] HP 105B Modification
I have a late-model 105B Oscillator that's equipped with a 10811-60109
oscillator. It seems a shame to have that nice 10 MHz source without
having access to it. I was thinking of adding a buffer amp
@febo.com
Subject: [time-nuts] HP 105B Modification
I have a late-model 105B Oscillator that's equipped with a 10811-60109
oscillator. It seems a shame to have that nice 10 MHz source without
having access to it. I was thinking of adding a buffer amp and bringing
out the 10 MHz signal
Ed Palmer wrote:
I have a late-model 105B Oscillator that's equipped with a 10811-60109
oscillator. It seems a shame to have that nice 10 MHz source without
having access to it. I was thinking of adding a buffer amp and
bringing out the 10 MHz signal. It shouldn't be too hard, but before
I
...@sasktel.net
Date: Mon, 07 Dec 2009 11:03:51 To: Time Nuts Mailing
Listtime-nuts@febo.com
Subject: [time-nuts] HP 105B Modification
I have a late-model 105B Oscillator that's equipped with a 10811-60109
oscillator. It seems a shame to have that nice 10 MHz source without
having access to it. I
Ed,
The easiest way is to couple out the 10Mhz from the two pins on the
connector holding the 10811 into a Fet input buffer amplifier that can
drive 50 ohms.
There are lots of FET buffer schematics floating around.
Try the radio amateurs handbook or google it.
Good Luck!
Corby Dawson
Corby Dawson wrote:
Ed,
The easiest way is to couple out the 10Mhz from the two pins on the
connector holding the 10811 into a Fet input buffer amplifier that can
drive 50 ohms.
There are lots of FET buffer schematics floating around.
Try the radio amateurs handbook or google it.
Good Luck!
: Montag, 7. Dezember 2009 23:17
An: Discussion of precise time and frequency measurement
Betreff: Re: [time-nuts] HP 105B Modification
Corby Dawson wrote:
Ed,
The easiest way is to couple out the 10Mhz from the two pins on the
connector holding the 10811 into a Fet input buffer amplifier
ohms.
Very simple and might be just the thing you're looking for.
John
KB1FSX Sent via BlackBerry by ATT
-Original Message-
From: Ed Palmer ed_pal...@sasktel.net
Date: Mon, 07 Dec 2009 11:03:51 To: Time Nuts Mailing
Listtime-nuts@febo.com
Subject: [time-nuts] HP 105B Modification
I
Ed Palmer wrote:
Yes, I have the same configuration. The part number for the divider
board is 05061-6165. The 10811 + daughter boards are used in the
105B, 5061B Cesium, and the 5065A Rubidium. The circuit loading
problem is exactly the kind of issue I was expecting. Thanks for the
Thanks Bruce. This is the kind of info I was looking for. I'll have to
study your schematics. The purpose of much of it isn't immediately
obvious. :-)
Ed
Bruce Griffiths wrote:
Ed Palmer wrote:
I have a late-model 105B Oscillator that's equipped with a
10811-60109 oscillator. It seems
Perhaps, but given what it's replacing and what it's driving, is the
difference significant?
Ed
Bruce Griffiths wrote:
Ed Palmer wrote:
Yes, I have the same configuration. The part number for the divider
board is 05061-6165. The 10811 + daughter boards are used in the
105B, 5061B Cesium,
Ed
If it helps I can send you some LTSpice schematics so that you can
simulate the circuit for yourself.
The breadboards behave as predicted by the simulations at 10MHz.
John Miles has done some preliminary phase noise measurements on his
version.
The transformers are wound on binocular
If you send me the schematic for the circuit in which its used I can
answer that question better.
Bruce
Ed Palmer wrote:
Perhaps, but given what it's replacing and what it's driving, is the
difference significant?
Ed
Bruce Griffiths wrote:
Ed Palmer wrote:
Yes, I have the same
Ed
If it helps I can send you some LTSpice schematics so that you can
simulate the circuit for yourself.
The breadboards behave as predicted by the simulations at 10MHz.
John Miles has done some preliminary phase noise measurements on his
version.
The transformers are wound on binocular
That would help. Perhaps they should be added to the web page. I'm
sure that I'm not the only one who would be interested.
Ed
Bruce Griffiths wrote:
Ed
If it helps I can send you some LTSpice schematics so that you can
simulate the circuit for yourself.
The breadboards behave as
The schematic is available here:
http://www.murgatroid.com/t_and_m/hp-00105-6100-figs.pdf . It's also
available with circuit description waveforms here:
http://www.kennethkuhn.com/hpmuseum/scans/hp5065a_part3.pdf on pages
93-101 (pdf pages - not document pages). However, this copy doesn't
I was wondering about that transformer. Thanks for the cross-reference.
Ed
John Miles wrote:
Ed
If it helps I can send you some LTSpice schematics so that you can
simulate the circuit for yourself.
The breadboards behave as predicted by the simulations at 10MHz.
John Miles has done some
I'll extend the webpage (in the next few days) to include more
variations of the circuit as well as the associated LTSpice schematic files.
However at some stage a breadboard is necessary to validate the
simulations, in particular the effect of transformer parasitics.
I have done some
Since the T13-1 has a centre tapped secondary there are 2 useful
amplifier configurations that can be used.
One has a nominal gain of about 5dB whereas the other has a gain of
around -1dB (can still be useful since the amplifier input impedance at
10Mhz is about 1k when the 51 ohm input shunt
Ed
Given that the divider load current, if one substitutes a 5V CMOS
flipflop for the 7474, only increases to about 5mA pp, using a 74HC74 is
probably prudent given the PCB layout used, in that it may avoid EMI
issues that may be a problem with faster logic. However it may then be
prudent to
Bruce Griffiths wrote:
Ed
Given that the divider load current, if one substitutes a 5V CMOS
flipflop for the 7474, only increases to about 5mA pp, using a 74HC74
is probably prudent given the PCB layout used, in that it may avoid
EMI issues that may be a problem with faster logic. However it
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