开云体育

Hello CV,
Original reference uses BFR92 which is plenty good enough for this gadget. Per result of 45 sec search, look in Philips catalogs:



(copy entire line sans line breaks)

Regarding silver: they likely mean silvered copper to reduce skin effect losses (improve conductance of the wire surface layer, a common treatment of high-power transmitter hardware).

Regarding microphone: search for electret microphone. You will see it is a capacitor driving a JFET.

ME

Hello Christian,

When I assume C1=18pF and C30=2pF, a reasonable diode model
could be as shown below.

.model BB105 D(Is=.1p Rs=1 Bv=35 Ibv=10u Cjo=35p Vj=.75 M=.8)

Use Cjo and M to adjust the capacitance.


The ECM is a V-source with 1kOhm or 2kOhm output resistance.

I think using silver wire or copper wire doesn't matter.
You can try to calculate the resistance taking skin effect into
account.

Be aware that all the components have inductance of 0.5nH to 1nH
per mm of wire length.

Best regards,
Helmut

I'm not sure we should help you with an illegal transmitter, especially
as it can be used to invade privacy.

I need this information only in this simulation. I have to simulate it for my bachelor thesis.

I will not use this information in private contexts.

In message <kt5gi5+d3ua@...>, dated Mon, 29 Jul 2013, christianvierck <christianvierck@...> writes:

I need some help to simulate my circuit correctly.

I want to simulate a UHF-transmitter and I have problems with three devices in my curcuit.

I'm not sure we should help you with an illegal transmitter, especially as it can be used to invade privacy.
--
OOO - Own Opinions Only. With best wishes. See www.jmwa.demon.co.uk
Why is the stapler always empty just when you want it?

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

Hey guys,

I need some help to simulate my circuit correctly.

I want to simulate a UHF-transmitter and I have problems with three devices in my curcuit.

Here you can see the circuit diagram:

Now the three devices which exasperate me.

1. BB105: I did not find any model for this device. I'm not sure if it's manufacturing stoped. Can someone help me with this? A alternative model or sth.

2. ECM: Like other microphones I used a voltage source in my simulation. Now I'm not sure how to connect it with my curcuit?

3. Silver wire: Can I leave it for a simulation because of the same conductance as a copper wire?

Have a nice day,
CV

In message <kt59nb+uf0v@...>, dated Mon, 29 Jul 2013, shukichi2079 <shukichi2079@...> writes:

This is Shukichi.
I want to check Starter circuit
that move correctly or not.
Circuit is power supply with
starter.

This is not enough information for us to be able to help you. Please post your schematic AND all model and subcircuit files need to run it to Files => Temp on the list's web site, as a zip archive.
--
OOO - Own Opinions Only. With best wishes. See www.jmwa.demon.co.uk
Why is the stapler always empty just when you want it?

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

Hello.

This is Shukichi.
I want to check Starter circuit
that move correctly or not.
Circuit is power supply with
starter.
I think it is checked by transient
simulation, and tried some conditons.
but it didn't move correctly.
There were no difference between
circuit with starter and without starter.

please teach it.

Regards.
Shukichi

In message <CALBs-Ti+aoOcfQycr1TTkGEM_rctOP6+uArGyOTTS=YT=xJhsA@...>, dated Sun, 28 Jul 2013, Andy <Andrew.Ingraham@...> writes:

If instead all you have is a physical description of the lines and topologies, then SPICE's standard transmission line element might be the best choice.

One significant effect in PLC is mode conversion; the signal is launched differentially but mode conversion to common-mode occurs at discontinuities in the cables, such as Y-junctions, switches etc. The cables have three conductors and should be treated as 3-wire transmission lines (which is written-up in the literature). So a 3-wire 'cell', used with LTspice's 'array' feature is more appropriate than the standard transmission line.
--
OOO - Own Opinions Only. With best wishes. See www.jmwa.demon.co.uk
Why is the stapler always empty just when you want it?

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

I'm connecting diodes to relays and the diode symbol is almost as large as the entire relay symbol. The appearance of the combination and how the connections are made is very awkward looking.

Given a plot of a pink or white noise voltage, and a synchronized plot of the current induced in a partially reactive load -

Will the 'normalized' ratio of the FFT plots be an indication of Z?

I'm looking at the low frequency end of the FFT, to avoid sampling issues. By normalized, I mean that 1 volt would produce 1 amp with both plots resolving to 0dB at the minimum sampled frequency (the load being partially inductive in this example).

It seems much too simple......

RL

I've just begun using LTspice and don't seem to be able to discover how to
resize individual components.

What sort of "resize" are you referring to?

If you want to resize the schematic symbols, the size of each symbol is
fixed. You would have to create new symbols with different sizes. LTspice
includes a symbol editor.

Andy

I've just begun using LTspice and don't seem to be able to discover how to resize individual components.

hal8000b wrote:

Let me save you a lot a trouble. The domestic ring main is not a high speed

data circuit. If you take data at 1Mbps then 1 data bit is just 1 micro
second duration.
...

I have mixed feelings about this.

First, it is a homework assignment. She cannot "save herself the trouble"
by telling the teacher that the assignment was wrong because the method is
inferior to running brand new copper or fiber. Sometimes it is impractical
to do that and you need to work with what you have.

Note that the signal range is 90-150 kHz, so it is not very high speed and
the symbol rate can't be anything close to 1Mbps. It also isn't the "BPL"
that floods the power lines with 2-50 MHz, used for Internet access, and a
major source of interference.

Power line communications have been used for close to a century, by the
power utilities themselves to monitor their own circuits without having to
run additional wires. The signaling rate might be as low as 1 to 10bps
(bps, not Mbps). I'm sure the power companies understand the difficulty of
carrying data signals in a noisy environment.

I am puzzled about the choice of a matrix representation for the lines. It
seems to me that gives you two major hurdles: how to generate the matrices
for typical power lines, and how to use it in a simulator. It would be one
thing if you were handed the matrices and instructed to use them. If
instead all you have is a physical description of the lines and topologies,
then SPICE's standard transmission line element might be the best choice.

Be aware that some things in SPICE work nicely in the frequency domain (.ac
analysis) but not the time domain (.tran analysis) or vice-versa.
(Transmission line models work correctly in both.)

Regards,
Andy

I can't tell you how much I love LtSpice, or how much I have LEARNED about electronics in general since using LtSpice. I am shopping for a new laptop running full-blown Windows, not a tablet running Windows-8-RT. Does LtSpice support touch screen gestures such as pinch/expand or finger swipes to move the schematic / plot window around?

Even without touchscreen gesture support, LtSpice has the best user experience of any free Spice-simulator/schematic-capture/data-plotting tool that I have ever used.

Thank you from the bottom of my heart to Mike Englehardt, Helmut, Linear Technologies, the usergroup, and anybody else I forgot for this great FREE product and user experience!

Hutchtronix

--- In LTspice@..., "spencer_pace" <spencer_pace@...> wrote:

New to LTSpice; Trying to do a simple design to learn the program. Is there a way to plot parameters of the FET? Ex., overdrive voltage (need Vth)? How might I print out the gate parasitic capacitance and plot this vs the overdrive voltage?

Even better, does anyone have an example of a design using gm/Id method in LTSpice? I expect this question has been asked many times, but I cannot find an answer from my searches.

Thanks,
Spencer

Hello Spencer,

You should search in the Files-directory for "gm".

Files > Tables of Contents > all_fies.htm


Best regards,
Helmut

New to LTSpice; Trying to do a simple design to learn the program. Is there a way to plot parameters of the FET? Ex., overdrive voltage (need Vth)? How might I print out the gate parasitic capacitance and plot this vs the overdrive voltage?

Even better, does anyone have an example of a design using gm/Id method in LTSpice? I expect this question has been asked many times, but I cannot find an answer from my searches.

Thanks,
Spencer

Many Thanks Helmut !

罢辞耻蹿颈办é


Le 28/07/2013 15:36, Helmut a écrit :

--- In LTspice@... <mailto:LTspice%40yahoogroups.com>,
罢辞耻蹿颈办é HENNI-CHEBRA <henni.chebra@...> wrote:

Hi,

Where can I download the triode 845 model for LTSpice please ?

Best regards


罢辞耻蹿颈办é HENNI-CHEBRA

Hello 罢辞耻蹿颈办é,

Files > Lib > Tubes_Valves > Rydel_tubes.lib


It looks like it's the same model as in this file.

Files > Lib > Tubes_Valves > Excem > lampes_lt.lib


Best regards,
Helmut

[Non-text portions of this message have been removed]

--- In LTspice@..., 罢辞耻蹿颈办é HENNI-CHEBRA <henni.chebra@...> wrote:

Hi,

Where can I download the triode 845 model for LTSpice please ?

Best regards


罢辞耻蹿颈办é HENNI-CHEBRA

Hello 罢辞耻蹿颈办é,

Files > Lib > Tubes_Valves > Rydel_tubes.lib


It looks like it's the same model as in this file.

Files > Lib > Tubes_Valves > Excem > lampes_lt.lib


Best regards,
Helmut

Hi,

Where can I download the triode 845 model for LTSpice please ?

Best regards


Toufik HENNI-CHEBRA

--- In LTspice@..., John Woodgate <jmw@...> wrote:

The mention of POP/PSS analysis calls to mind a tool for detecting
electrolytic capacitors connected the wrong way round.

Hey, watch it - my recent development project has resembled that
remark on one or two occasions. POP! PSS-sssssss..., indeed!