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John Fields
Guest
Sun Oct 30, 2011 1:03 pm
On Sun, 30 Oct 2011 00:29:18 -0700 (PDT), fred ander
<fredander503_at_gmail.com> wrote:
Quote:
On Oct 29, 9:09 pm, John G <greent...@ozemail.com.au> wrote:
Phil Allison presented the following explanation :> "John G"
LEARN TO TRIM
Yes you are correct I should have deleted the rubbish that was of no
use to the OP.
He did not recognise it, much less be able to make any use of it.
--
John G.
***************************************************************************
I'm sorry! I did not mean to cause any problems.
I apologize! ! !
I will try not to ask any more questions of this forum.
fredander
---
You've done nothing wrong, so please don't be put off by the bad
behavior of some here.
As Ian pointed out, the "mystery text" is an LTspice circuit list
which can be turned into a schematic and simulated using the procedure
he outlined.
If you have any questions about the circuit, please post back and I'll
be happy to clear up what I can. :-)
--
JF
Fred Abse
Guest
Sun Oct 30, 2011 2:32 pm
On Sat, 29 Oct 2011 17:27:08 -0700, fred ander wrote:
Quote:
I'm sorry ! I have absolutely no clue what this list
of #s means and/or what it is used for
It's an LTSpice listing.
LTSpice is available, free, from the Linear Technology website. Download
and install it, copy the lines of the newsgroup article (from "Version 4"
thru the last "TEXT" line) into any old text editor, and save it as, say,
"jfields_mixer.asc", then start LTSpice, and open your saved .asc file
there.
John's schematic should appear before your eyes, and you can run
analyses on it, plot waveforms, and edit the schematic.
LTSpice is becoming the de facto standard for exchanging, comparing, and
discussing circuit suggestions on sci.electronics newsgroups, principally
because its source files are pure ASCII text.
--
"For a successful technology, reality must take precedence
over public relations, for nature cannot be fooled."
(Richard Feynman)
amdx
Guest
Sun Oct 30, 2011 2:59 pm
Quote:
He is believed to have severe mental health issues.
** Is that not the grossest abuse and utterly without justification ?
Listen the one here with OBVIOUS metal health issues is YOU.
..... Phil
We could vote!
Ian Healthy (#) Severe Mental Issues ( )
Phil Healthy ( ) Severe Mental Issues (#)
Sorry Phil the vote doesn't look good so far, the poles aren't
closed in Australia yet, maybe that will turn things in your favor.
Or not.
Mikek
patricia herold
Guest
Sun Oct 30, 2011 5:57 pm
On Oct 28, 6:24 pm, Tim Wescott <t...@seemywebsite.com> wrote:
Quote:
On Fri, 28 Oct 2011 01:15:09 -0700, fred ander wrote:
Greetings to All: There are RF mixers such as the SBL-1 which works
well in the MHz range.
I am interested in mixing 25KHz with 20KHz to get 5KHz and 45KHz such
that I can hear the
difference thru an amp & spkr. Does anyone have any ideas as to what to
use for an ultrasonic
mixer? Thank you 4 your time & attention.
Anything that multiplies.
* An analog multiplier.
* A handful of 4052 analog multipliers, some op-amps,
and some logic (http://www.wescottdesign.com/articles/MSK/page_76.html)
* A handful of better quality analog switches and some logic.
* An NE612.
* A diode-ring mixer, either fed with some Great Big Transformers,
or fed with balanced signals that are generated using op-amps.
* Two ADC channels (if the signals are already in the analog world)
and a DSP chip.
etc.
--www.wescottdesign.com
Dang, I forgot all about the diode ring.... And we sell a product
that uses one!
(Are diode rings in the mini-circuits RF mixers?)
Thanks Tim
George H.
patricia herold
Guest
Sun Oct 30, 2011 6:00 pm
On Oct 30, 3:29 am, fred ander <fredander...@gmail.com> wrote:
Quote:
On Oct 29, 9:09 pm, John G <greent...@ozemail.com.au> wrote:
Phil Allison presented the following explanation :> "John G"
LEARN TO TRIM
Yes you are correct I should have deleted the rubbish that was of no
use to the OP.
He did not recognise it, much less be able to make any use of it.
--
John G.
***************************************************************************
I'm sorry! I did not mean to cause any problems.
I apologize! ! !
Quote:
I will try not to ask any more questions of this forum.
fredander
Nah, ask more question! That's fine. You do need to have some thick
skin at times.
George H.
whit3rd
Guest
Sun Oct 30, 2011 10:50 pm
On Friday, October 28, 2011 1:15:09 AM UTC-7, fred ander wrote:
Quote:
Greetings to All: There are RF mixers such as the SBL-1 which works
well in the MHz range.
I am interested in mixing 25KHz with 20KHz to get 5KHz and 45KHz such
that I can hear the
difference thru an amp & spkr.
If your signals are pure sinewaves, a good mixer is a multiplier
circuit (F1 and F2 inputs give an output that has (F1+F2) and |F1-F2|
frequencies). If, on the other hand, your signals are squarewaves,
like from a simple NE555 type oscillator, all it takes is an
XOR gate, like (in CMOS through-hole package) CD4030 or CD4077.
A dollar will buy you two, each has four XOR gates.
The range of analog mixers is large, and includes almost all
nonlinear electronic parts: diodes, transistors, FETs. With
some care in design, any of these can mix down ultrasound.
The MiniCircuits mixers are based on matched diodes,
Gilbert cells use matched transistors (usually in integrated
circuit form). These cover more RF range than you need.
One can wire the LM13700 into two multiplier circuits,
and that's about a dollar.
See figure 6 in the datasheet...
<http://www.national.com/mpf/LM/LM13700.html#Overview>
Ron M.
Guest
Wed Nov 02, 2011 3:31 am
On Oct 30, 3:29 am, fred ander <fredander...@gmail.com> wrote:
Quote:
On Oct 29, 9:09 pm, John G <greent...@ozemail.com.au> wrote:
Phil Allison presented the following explanation :> "John G"
LEARN TO TRIM
Yes you are correct I should have deleted the rubbish that was of no
use to the OP.
He did not recognise it, much less be able to make any use of it.
--
John G.
***************************************************************************
I'm sorry! I did not mean to cause any problems.
I apologize! ! !
I will try not to ask any more questions of this forum.
fredander
Fred. Just ignore the abusive posters. They are numerous and some are
rather arrogant. However even some of them are correct occasionally.
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