LTspice problem

[confounded]

Thank you for replying Torben.

Bingo!

It now runs

I would like to go looking on the web and get a load of models that i dont have right now, must i always have an include line for these downloaded models everytime i want to use one? Or is there some way to make them like the models that come with LTspice and you just go component and select the one you want?

 

[ericgibbs]

Morning Torben,
Used your description, now have the original model file working.

For some reason yesterday it would not work as its set out today.

I must have been making a typo somewhere.

Thanks for the input, be good.

Regards

 

[Torben]

Morning Torben,
Used your description, now have the original model file working.

For some reason yesterday it would not work as its set out today.

I must have been making a typo somewhere.

Thanks for the input, be good.

Regards

Hi Eric!

Getting typos is easier for me than being good. But I will try anyway.


Hope you are well,

Torben

 

[ericgibbs]

hi Torben,

This site has just under 8000 Spice models.

Its a site deisgned for 'younger' engineers.

**broken link removed**

 

[confounded]

Only around 8000, well i guess thats a start. Thank you for the link.

But is there a way to save those models without having to add an include line on my schematic everytime i use one?

I would like to just be able to press 'component' and select a downloaded model and then place it in my schematic and do no more

 

[unclejed613]

you can take everything from .model to the end of the file, and copy/paste it into the standard.bjt file. then you don't even need any spice directive to use it. it will come up in the list when you open a "change transistor type" window.

 

[confounded]

Thank you for replying unclejed

Can i confirm a few things because i tried to do what you said and it didnt work.

Is the standard.bjt file found in LTspiceIV\lib\cmp ?
When i pasted into this file i go to save and i get the error message:

Access to C:\program Files\LTC\LTspiceIV\lib\cmp\standard.bjt was denied

As shown in my attachment

 

[ericgibbs]

Thank you for replying unclejed

Can i confirm a few things because i tried to do what you said and it didnt work.

Is the standard.bjt file found in LTspiceIV\lib\cmp ?
When i pasted into this file i go to save and i get the error message:

Access to C:\program Files\LTC\LTspiceIV\lib\cmp\standard.bjt was denied

As shown in my attachment

hi,
Ive tried this method, it works OK.

It sounds as though the *.bjt maybe 'read' only or you dont have the full Admin rights to change the file. Thats a function of Windows.

Looking at the image, I would say you need to check 'adminstrators rights' in Vista

 

[confounded]

How do i solve my problem then?
I'm the only user on my comp i authorize myself

 

[ericgibbs]

How do i solve my problem then?
I'm the only user on my comp i authorize myself

It looks like Vista,?
I use XP Pro, it may not be the same.?

 

[confounded]

Any ideas how i can fix it are welcome

 

[ericgibbs]

Any ideas how i can fix it are welcome

Use the Windows Help.

Look at these images for XP, they may help you find the problem.

 

[ericgibbs]

hi,
I would recommend that you make a backup copy of any of the 'cmp' files, before you change them.

Use the edited version for testing.

 

[confounded]

It does not give me the option of clicking 'details' under the general heading (as shown in 1st screen shot)

But under security heading i can see permission status which i am assuming is what it wanted me to do? and i see that i have full permission at the moment anyway (screen shot 8)

 

[ericgibbs]

I have posted my settings.
As I dont use Vista, I have to give XP examples.

Access the Control Panel window.

 

[confounded]

I set my settings to exactly how you have in your screen capture and it still doesn't work

 

[Roff]

I haven't read the entire thread, but here is how I add transistor models to LTspice:
1. Make sure LTspice is not open.
2. Copy this portion of the model file:

.MODEL Qbc847bpdw1t1-npn npn
+IS=1.02883e-10 BF=3441.88 NF=1.5 VAF=50.4069
+IKF=0.0513316 ISE=6.57032e-12 NE=1.90684 BR=11.3392
+NR=1.5 VAR=2.18491 IKR=0.513316 ISC=1e-16
+NC=4 RB=0.117532 IRB=0.100021 RBM=0.100913
+RE=0.376664 RC=1.88332 XTB=50 XTI=4
+EG=1.05 CJE=9.22073e-12 VJE=0.680201 MJE=0.85
+TF=5.8626e-10 XTF=3.3324 VTF=7.33802 ITF=0.210664
+CJC=4.07024e-12 VJC=0.95 MJC=0.347426 XCJC=0.800007
+FC=0.114115 CJS=0 VJS=0.75 MJS=0.5
+TR=1e-07 PTF=0 KF=0 AF=1

3. With Notepad, open the file C:\Program Files\LTC\LTspiceIV\lib\cmp\standard.bjt, move the cursor to the bottom of the file, and paste the model that you just copied.
4. Save the file.

Start LTspice and open a new or existing schematic window.
Place an NPN symbol on the schematic.
Right-click on the NPN symbol and select Pick New Transistor.
A window will open with all available NPN models.
The new model name should be at the bottom of the list.
Highlight it and click OK.

 

[confounded]

Thank you for replying Roff

I did as you say but when i go to save i get the error message shown in screen print 9

Then when i press ok on that error message i get the 'save as' box as shown in scrren print 10

then when i try to save it anyway i get another error message shown on screen print 12

 

[Torben]

Hey confounded,

What are the permissions on the cmp/ directory? That could also be your problem.


Regards,

Torben

 

[confounded]

Thank you for replying Torben

The cmp directory was on read only so i unchecked that but it still didnt work.
Then i thought why not make sure the entire LTspice folder is not on read only so i did and unchecked that too. Hope thats ok?

Well anyway I managed to save the cmp file in notepad

However when i open LTspice and right click on new transistor i do see the new transistor but its values of vceo and ic are zero

whats gone wrong ths time?