开云体育

Ok. So if I unzip this and put it in the cmp path, does it get overwritten when I do sync_release?

Thanks,
Jim

In message <kkhgj0+b6hu@...>, dated Mon, 15 Apr 2013,
"theac1@..." <theac1@...> writes:

I am trying to post a question here but for some reason LTC won't allow
me to copy the error log and post it here for my actual question. Is
there a way?

Assuming you are using a PC, select all the text (CTRL-A), copy (CTRL-C)
and paste (CTRL-V) into Notepad or Word or something like that, or
directly into your message.

You can also set up LTspice using 'Control panel' (the hammer icon) so
as not to delete the .log file when you close the .asc file. It is just
a text file and will appear in the same folder as your .asc file.
--
OOO - Own Opinions Only. See www.jmwa.demon.co.uk
They took me to a specialist burns unit - and made me learn 'To a haggis'.

John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK

On Sat, 13 Apr 2013 15:47:49 -0000, Tim wrote:

I just uploaded a another copy of the JT, because I wnat to
use it as a techng aid to introduce a family member to some
EE concepts and LTspice. He just graduated high school and
has no exposure but a lot of interest in electronics.

So having read the recent thread on the JT, I though it
might be an excellent resource for him as it exposes
transistor and switching theory and a lot of concepts in an
easy to understand project that he can build and use my lab
tools to verify the expected behavior.

In my posted version, derived from
, I tried to added a second
circuit to compare the effects of using a different
transistor than the B549 in the reference article and I
attempted to estimate the Joules being consumed (atfter all
it is a Joule Thief.

If anyone cares to comment on how I might do this better
(for the intended purpose), please do so.

I just posted up an example I wrote some time back. I added a
comment or two to it before posting, though. It's in the Temp
directory and called Joule_Thief_jk1.asc.

It uses the basic energy equation to develop the expected
peak current required. It's ability to calculate the exact
frequency and the exact peak current given a specific
transistor is only approximate, though. The base resistance
calculation is only very approximate. Some tweaks are
included to allow closer approximations.

Note, the inductor coupling constant is given as 1 -- in
reality it never will be. Feel free to adjust the equations
to take a more realistic value into account.

Also, I have an additional paper I wrote on the Joule Thief
that includes details the above considerations plus others,
such as Bmax, in those cases where an air core isn't used.
The Bmax value places additional constraints on the choice of
inductance value vs frequency, to avoid saturation effects
due to volt-seconds (which the Joule thief doesn't not
require and works perfectly well avoiding.) If interested in
the paper, feel free to write and I will send it along in an
email (PDF form.)

Jon

In message <kkbun5+ctqn@...>, dated Sat, 13 Apr 2013, Tim
<thutches@...> writes:

I just uploaded a another copy of the JT, because I wnat to use it as a
techng aid to introduce a family member to some EE concepts and
LTspice. He just graduated high school and has no exposure but a lot
of interest in electronics.

Too late! You need to start at Grade 2 or earlier. (;-)

So having read the recent thread on the JT, I though it might be an
excellent resource for him as it exposes transistor and switching
theory and a lot of concepts in an easy to understand project that he
can build and use my lab tools to verify the expected behavior.

It may be me, but I don't find non-linear oscillators at all simple.

In my posted version, derived from , I
tried to added a second circuit to compare the effects of using a
different transistor than the B549 in the reference article and I
attempted to estimate the Joules being consumed (atfter all it is a
Joule Thief.

If anyone cares to comment on how I might do this better (for the
intended purpose), please do so.

I favour sine-waves and audio frequencies, but we are all different.
--
OOO - Own Opinions Only. See www.jmwa.demon.co.uk
They took me to a specialist burns unit - and made me learn 'To a haggis'.

John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK

Hi Jim.
Thanks for your comment on the type of material the transistor. I removed a tag MFG=Germanium-type.
Use the my Standard.zip file.
Bordodynov.

12.04.2013, 20:10, "gr8wi9" <boothjg@...>:

--- In LTspice@..., ?????…???"???????' ?????'?????????????— <BordodunovAlex@> wrote:

Hi John Woodgate.
Thanks for the info. In my Standard.zip file is 2N242 and germanium transistors 2N2955. Using these models and your information I will make models of transistors AC128 AC127 more believable.
Bordodynov.

I don't see either of these in the standard library. I placed a pnp in a new schematic then right-click Pick New Transistor. I just did a sync release too. Decades ago 2N2955 was a silicon part (complementary to 2N3055).

Jim