Colpitts crystal oscillator in LTSPICE

Started by bitrex in sci.electronics.design6 years ago 59 replies

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...


A current mirror variation on the Baxandall Class-D oscillator for producing a reasonable clean sine wave.

Started by Bill Sloman in sci.electronics.design1 year ago 8 replies

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...


"Mike Engelhardt has parted ways with Analog Devices"

Started by Simon S Aysdie in sci.electronics.design2 years ago 119 replies

"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


erreur: Time step too small sur LTspice

Started by Fivota in sci.electronics.design6 years ago 3 replies

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


Arbitrary delay in LTspice

Started by Phil Hobbs in sci.electronics.design7 years ago 7 replies

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 ...


TUTORIAL - Example 1, Using Femm to Calculate Component Values of Simple Microstrip to use in LTspice/PSpice

Started by RobertMacy in sci.electronics.design7 years ago 31 replies

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...


Antenna Simulation in LTspice

Started by rickman in sci.electronics.design9 years ago 41 replies

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...


AN: New Spice Model Posted to my Website

Started by Jim Thompson in sci.electronics.design6 years ago 1 reply

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...


Why is there no dual gate fets in LTspice?

Started by LM in sci.electronics.design9 years ago 30 replies

There are many kinds of them for instance from NXP.

There are many kinds of them for instance from NXP.


Newest LTspice update has lots of AD op amps.

Started by Gerhard Hoffmann in sci.electronics.design4 years ago 10 replies

just saw it while updating. cheers, Gerhard

just saw it while updating. cheers, Gerhard


LTspice tutorial

Started by Charles in sci.electronics.design9 years ago 2 replies

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


LTspice, tools used for its creation?

Started by M Philbrook in sci.electronics.design6 years ago 19 replies

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


LTSPICE model for Ge transistors

Started by petrus bitbyter in sci.electronics.design2 years ago 7 replies

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


LT spice _ LM7812

Started by nescafe in sci.electronics.design8 years ago 12 replies

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

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


TI's Web Bench question

Started by John S in sci.electronics.design1 year ago 9 replies

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 Use Qucs ?

Started by Anonymous in sci.electronics.design4 years ago 1 reply

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...


Helmut Sennewald RIP

Started by Joerg in sci.electronics.design1 year ago 5 replies

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/


Why Not ?

Started by Anonymous in sci.electronics.design8 years ago 20 replies

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...


LM386 & Spice

Started by Anonymous in sci.electronics.design5 years ago 38 replies

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....

Started by Jim Thompson in sci.electronics.design10 years ago 2 replies

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 | |...