I'm trying to simulate a low frequency Colpitts oscillator in LTSpice using an NPN darlington and a crystal, and I'm having a lot of trouble...

I'm trying to simulate a low frequency Colpitts oscillator in LTSpice using an NPN darlington and a crystal, and I'm having a lot of trouble getting it to start up. Does anyone have a working one of these? I'm just using a capacitor to simulate the crystal, the parameters I am working with are something like: motional capacitance: 5.3ff ESR = 11k ESI ~ 4500 henries EPR = 100 meg E...

I've up-dated my website to add a circuit diagram, some comment on it, and the text from the corresponding LTSpice .asc...

I've up-dated my website to add a circuit diagram, some comment on it, and the text from the corresponding LTSpice .asc file. http://sophia-electronica.com/BillsBaxandall.html The circuit produces a balanced pair of 1V rms 17kHz sine waves. The LTSpice simulation suggests the third harmonic content is about 60db below the fundamental, and the fifth harmonic is even smaller. It's not a par...

"This does not bode well for the future of LTspice now that Mike Engelhardt has parted ways with Analog Devices."---analog spiceman...

"This does not bode well for the future of LTspice now that Mike Engelhardt has parted ways with Analog Devices."---analog spiceman https://groups.io/g/LTspice/topic/cloud_over_ltspice/71467233

Bonjour, Je simule mon circuit sur le logiciel "LTspice" et il m'affiche cet erreur là "Time step too small; time=153.341,...

Bonjour, Je simule mon circuit sur le logiciel "LTspice" et il m'affiche cet erreur là "Time step too small; time=153.341, timestep=1.43134e-013: trouble with u16:np-instance q:u16:3" s'il vous plait est ce que quelqu'un peut m'aider à résoudre ce problème ? Merci Fivota

Awhile back we were trying to figure out how to make a voltage-variable delay line in LTspice. Turns out there is a way to use one signal to...

Awhile back we were trying to figure out how to make a voltage-variable delay line in LTspice. Turns out there is a way to use one signal to delay another: there's an undocumented function delay(x,y). Unlike the documented one, delay y can be a simulation variable, like so: Version 4 SHEET 1 880 680 WIRE -96 112 -112 112 WIRE 96 112 80 112 WIRE 112 112 96 112 WIRE 304 112 288 112 ...

I offer to share with you a TUTORIAL but don't know how to get it into your hands. The TUTORIAL is about 15kB, zipped, and describes the...

I offer to share with you a TUTORIAL but don't know how to get it into your hands. The TUTORIAL is about 15kB, zipped, and describes the step-by-step process of using FREE femm 4.2 to analyze a simple PCB structure to calculate values to then use in circuit simulation, LTspice/PSpice. The sequence can be modified for use in analyzing really complex structures, structures where th...

I am working on a simulation for a loop antenna in LTspice and I can't figure out why the signal strength features are what they are. The...

I am working on a simulation for a loop antenna in LTspice and I can't figure out why the signal strength features are what they are. The model uses a pair of loosely coupled inductors to model the transmitter and antenna loop with a separate pair of tightly coupled inductors to model the coupling transformer. A cap on the primary circuit is the tuning cap and a cap on the secondary is...

New Spice Model Posted to my Website: Every Spice Simulator has their own proprietary way of implementing digital functions... LTspice Digital...

New Spice Model Posted to my Website: Every Spice Simulator has their own proprietary way of implementing digital functions... LTspice Digital Primitives don't play on PSpice, PSpice Digital Primitives don't play on LTspice... neither play anywhere else. Thus I have rolled my own Spice Model for the venerable HC4538 one-shot that uses universal behavioral modeling for the digital elemen...

There are many kinds of them for instance from NXP.

There are many kinds of them for instance from NXP.

just saw it while updating. cheers, Gerhard

just saw it while updating. cheers, Gerhard

http://highered.mcgraw-hill.com/sites/0073373796/student_view0/lt_spice_instructions_and_support _files.html

http://highered.mcgraw-hill.com/sites/0073373796/student_view0/lt_spice_instructions_and_support _files.html

Does any one know what Mike used for software tools to generate the engine and UI ? Jamie

Does any one know what Mike used for software tools to generate the engine and UI ? Jamie

Looking for models of Ge transistors I only found some that behaved like Si ones having a Vbe of 0.7V. Anyone can tell to find good...

Looking for models of Ge transistors I only found some that behaved like Si ones having a Vbe of 0.7V. Anyone can tell to find good ones? petrus bitbyter

What is the substitute for LM7812 in LTspice ? I can find any...

What is the substitute for LM7812 in LTspice ? I can find any...

I can't find a way to get TI's model into LTspice. So, I tried TI's online simulator. It does not give a reasonable output even using their...

I can't find a way to get TI's model into LTspice. So, I tried TI's online simulator. It does not give a reasonable output even using their default schematic. And, it is glacially slow -- they say it might take up to 15 minutes to complete an analysis. Has anyone else had this problem?

Anyone have experience with it ? I got it on a sayso from someone and it is= not bothering anything but, is it anything like Spice or LTSpice ?...

Anyone have experience with it ? I got it on a sayso from someone and it is= not bothering anything but, is it anything like Spice or LTSpice ? I see i= t uses the file extension SCH instead of ASC, both of which were used by W= indows. The SCH is for some kind of scheduler which I never use and never w= ould anyway. If I don't know where I am I certainly not telling anyone else= . :-) A...

Sebastian Wolf informed us in the German NG that Helmut passed away: https://groups.io/g/LTspice/topic/74768321#121677 I still cannot...

Sebastian Wolf informed us in the German NG that Helmut passed away: https://groups.io/g/LTspice/topic/74768321#121677 I still cannot believe it :-( -- Regards, Joerg http://www.analogconsultants.com/

At=20 https://dl.dropboxusercontent.com/u/29948706/tripl.jpg there is a screenshot of a circuit that is a bit screwed up because I don't= ...

At=20 https://dl.dropboxusercontent.com/u/29948706/tripl.jpg there is a screenshot of a circuit that is a bit screwed up because I don't= know how to quite use LTSpice yet. The letters are in the way, but really = it is still readable.=20 It is a basic voltage tripler I designed years ago to feed an audio power a= mp.=20 I get this everybody uses transformers everybody uses transfo...

I need to sim an LM386 amp to see what decoupling caps are neded for stability on end of life batteries. Is there a Spice model for this anywhere?...

I need to sim an LM386 amp to see what decoupling caps are neded for stability on end of life batteries. Is there a Spice model for this anywhere? My LTSpice seems to lack any of the IC models I'm likely to use. NT

Anyone Know who this is.... gazeee20@hotmail.com A definite POS, flooding my LTspice E-mail Inbox. Now filtered out. But I'll pay $10...

Anyone Know who this is.... gazeee20@hotmail.com A definite POS, flooding my LTspice E-mail Inbox. Now filtered out. But I'll pay $10 to anyone who takes a dump on his front porch ;-) ...Jim Thompson -- | James E.Thompson, CTO | mens | | Analog Innovations, Inc. | et | |...