I am new to Spice as well as LT Spice. I have input most of my circuit after spending much time looking for components. I have not run the...

I am new to Spice as well as LT Spice. I have input most of my circuit after spending much time looking for components. I have not run the circuit yet since I have a hole where a unijunction goes. The circuit additionally uses a triac, scr and transistor. I found the *Programable Unijunction Transistor pkg: TO-226AA .SUBCKT X2N6027 1 2 3 for a "generic" (to me) unijunction. B...

Is there a mixed-signal model of the CD4093 NAND Schmitt available that can be used in LTSpice? One that includes power supply connections and...

Is there a mixed-signal model of the CD4093 NAND Schmitt available that can be used in LTSpice? One that includes power supply connections and shows realistic supply currents, etc. Or any of that fashion of CMOS family such as hex inverters that can also be used as negative-feedback analog amplifiers

Does the wires assume real life situations to some degree or do we need to add stray inductance, Resistors and caps to act like a board? ...

Does the wires assume real life situations to some degree or do we need to add stray inductance, Resistors and caps to act like a board? I would of thought it would assume an average lay out of one persons worse nightmare and the actual real live circuit would just work better, seeing that this designer would engineer proper protocols on the board. It just seems that I don't se...

I know nothing about it, but there is discussion on this...

I know nothing about it, but there is discussion on this IOgroup, https://groups.io/g/LTspice/topic/new_simulator_written_by_mike/98208355?p=Created%2C%2C%2C20%2C2%2C180%2C0&jump=1 https://p.qorvo.com/qspice Dear Group! The simulator I've been working on for the last three years, mentioned here under its code name of S·P·Q·R, will beta imminently as QSPICE

I'm sitting on a heap of germanium transistors. From the time that computers made of discrete germanium transistors were decommissioned. Also 10...

I'm sitting on a heap of germanium transistors. From the time that computers made of discrete germanium transistors were decommissioned. Also 10 mm and 6 mm ferrite core. Can I make on oscillator, that runs on 1V , preferably using coils ? (Also trying to use LTSpice for the first time.) I can measure inductance of coils thanks to the miracle component testers from China. Groetjes Albert ...

A while ago somebody was inquiring about putting manufacturers' files in dedicated directories. Might have been josephkk, or George Herold, I...

A while ago somebody was inquiring about putting manufacturers' files in dedicated directories. Might have been josephkk, or George Herold, I can't remember. The only way I have found to do it is to put manufacturer directories as subdirectories of /lib/sub. You call them with ".lib " Like ".lib Zetex\ZTX415.sub" -- "For a successful technology, reality mus

I'm honing my Spice modeling skills and need some suggestions of devices whose manufacturer-provided Spice model doesn't match reality very...

I'm honing my Spice modeling skills and need some suggestions of devices whose manufacturer-provided Spice model doesn't match reality very well, or has serious issues. I'll try my hand at modeling the device and post my results on these newsgroups and on the LTspice list. It would be helpful if, when you make a suggestion, you state where and how it fails to match up with claimed data sh...

Gentlemen, Setting up voltage-controlled resistors is easy: R=(V(X)+0.01) or whatever. Works, always did. Doing the same with a capacitor...

Gentlemen, Setting up voltage-controlled resistors is easy: R=(V(X)+0.01) or whatever. Works, always did. Doing the same with a capacitor fails with this error message: Error on line 6 : c1 n002 0 c=(v(x)+0.01) Unable to find definition of model "c" * Unknown parameter "x" WARNING: Less than two connections to node X. This node is used by V4. Fatal Error: Missing capacitance ...

The Spice Model for the ADI 500MHz Four-Quadrant Multiplier has been updated (AD834_SPICE_Model.zip) on the Device Models & Subcircuits Page of...

The Spice Model for the ADI 500MHz Four-Quadrant Multiplier has been updated (AD834_SPICE_Model.zip) on the Device Models & Subcircuits Page of my Website, adding in the Spice model for RNOISELESS, and also an LTspice schematic symbol. Performance has been verified by Helmut Sennewald. ...Jim Thompson -- | James E.Thompson ...

Any TopSpice Users Here? I have an OpAmp model out there that runs fine on PSpice, LTspice, HSpice, etc., but balks on TopSpice. The error...

Any TopSpice Users Here? I have an OpAmp model out there that runs fine on PSpice, LTspice, HSpice, etc., but balks on TopSpice. The error report, from the TopSpice output file is: GSw_Sw3 N_22 -VB VALUE {((TANH(9.485/0.1*(V(SHUTDOWN, + GND)-0.5))+1)/2)*(V(N_22, -VB)/1)} 0*ERROR*: mismatched parentheses in above expression check result= -1 0*ERROR*: loading VALUE be...

Hello all, I am trying to simulate in LTSpice a circuit which contains a Hall effect current sensor (ACS758 for that matter). I don't have...

Hello all, I am trying to simulate in LTSpice a circuit which contains a Hall effect current sensor (ACS758 for that matter). I don't have its model, but the simulation doesn't need to cover all the corner cases, even a simplified model would be enough: There is a 100uOhm resistor R. The voltage drop across it should produce isolated voltage 2.5V+40[mV/A]*I(R). I can handicraft an op...

From the LTspice List... "analogspiceman" analogspiceman !!PING!! to Jim Thompson, Mike Engelhardt and anyone else who might posses...

From the LTspice List... "analogspiceman" analogspiceman !!PING!! to Jim Thompson, Mike Engelhardt and anyone else who might posses historical insider knowledge regarding PSpice... I am in the process of updating the depth and accuracy of the historical SPICE page over at the LTwiki: http://ltwiki.org/?title=LTspice_Genealogy_-_The_Heritage_of_Simulation_Ubiquity A while ago I ...

I downloaded and installed the Qspice beta. Despite many claims that it needs Win11 or a 64-bit Win10, it installed under Wine with no issues...

I downloaded and installed the Qspice beta. Despite many claims that it needs Win11 or a 64-bit Win10, it installed under Wine with no issues (Fedora 37). You do have to set it to mimic Win11 and not tell the app about the wine version. Its UI isn't a lot like LTspice, so I'll spend an hour or two with it over the weekend. Cheers Phil Hobbs -- Dr Philip C D Hobbs Principal...

Greetings people ! So lately, I have been working on my Sigma Delta ADC and before going advance, I wanted to have a base model WORKING (1ST...

Greetings people ! So lately, I have been working on my Sigma Delta ADC and before going advance, I wanted to have a base model WORKING (1ST ORDER, 3 bit digital output) . The circuit is quite simple. Input (x) -> Difference Amplifier -> Integrator (op-amp) -> Quantizer-> Encoder -> 3-bit Output (Y) -> Feedback DAC to the non-inverting pin of Difference Amplifier (I am using I

I'm simulating a rather simple circuit, but am not getting the appropriate results on AC analysis. I must be forgetting something about how to do...

I'm simulating a rather simple circuit, but am not getting the appropriate results on AC analysis. I must be forgetting something about how to do an AC analysis. I run a transient simulation and get what I expect. When the switch is open (5V on the control pin), the signal is attenuated four fold. When the switch is closed (0V on the control pin), the signal is attenuated 16 fold. But ...

Following the exchanges on SEB, about autotransformers, and turns ratio, I wrote these models. The subckts should run on any SPICE which...

Following the exchanges on SEB, about autotransformers, and turns ratio, I wrote these models. The subckts should run on any SPICE which supports .param and rser/rpar. The .asy files are for LTspice. The symbols should pick up the subckts without any need for a .lib directive. The first is simpler, requiring primary inductance, turns ratio, and primary resistance. The second examp...

I go to http://www.linear.com/designtools/software/ ans download LTspiceIV.exe, then install it. Impossible to update; get error message...

I go to http://www.linear.com/designtools/software/ ans download LTspiceIV.exe, then install it. Impossible to update; get error message that 'Could not read web file: "http://LTspice.linear-tech.com/fieldsync/release.log.gz". That file, if downloaded and applied, crashes with the error "Fatal Error: Trouble converting to curly brace notation: Mismatched single quotes in" [[bin...

The Baxandall parallel class-D oscillator "squegs" in real life if you build it with a high value inductance in the current feed and...

The Baxandall parallel class-D oscillator "squegs" in real life if you build it with a high value inductance in the current feed and bipolar switches. An LTSpice circuit using the Gummel-Poon model for the bipolar transistors doesn't show this - it settles down to a stable sinusoidal oscillation within less than a hundred cycles. The obvious effect of using a high value inductor is that the...

I tried to create an LTspice simulation of Jim Thompson's headphone amp (5/21/14 5:16 PM post). I got the supertex models from supertex.com and...

I tried to create an LTspice simulation of Jim Thompson's headphone amp (5/21/14 5:16 PM post). I got the supertex models from supertex.com and the TL082 model from TI. When run it produces the error message: Fatal Error: Port(pin) count mismatch between the definition of subcircuit "tl082" and instance: "xu2" The instance has more connection terminals than the definition. What have I g...

Hello, I am trying to simulate a buck and a boost converter using Christophe Basso's generic PWM models (in LTSpice) for voltage mode...

Hello, I am trying to simulate a buck and a boost converter using Christophe Basso's generic PWM models (in LTSpice) for voltage mode controlled and current mode controlled switched mode power supplies. These models have an integrated PWM generator and power switch. These models can be found here: http://cbasso.pagesperso-orange.fr/Downloads/IsSpice/Final%20models.zip (alternati...