11
votes
I'm trying to simulate an audio amplifier circuit but I couldn't find how to add LM386 to LTSpice like image. Is there any suggestions?
What I will do here
It isn't even clear to me what you actually want. One one hand, I think you may want a symbol. On the other hand, I think you may want a model. Or maybe both. I really cannot tell.
...
- 68.9k
8
votes
Accepted
Why is capacitor discharge time higher when an LED is included?
The short answer is the "voltage drop" of the diode, but the longer answer is the non-linear I-V characteristic of the diode. In hand-wavy engineering we resort to a simplified piecewise-...
- 2,039
8
votes
How can I model this power inductor more accurately?
Do you know that you need to model the nonlinearity?
Usual progression of model capabilities is something like: inductor (gets the basic dynamics right); inductor with resistance (modeling loss over a ...
- 836
6
votes
How can I model this power inductor more accurately?
You can build a simple saturable core model using an op-amp and a 1-F capacitor as shown by Larry Meares in a paper he published in 1986. The basic circuitry is shown below and mimics saturation ...
- 14k
6
votes
I'm trying to simulate an audio amplifier circuit but I couldn't find how to add LM386 to LTSpice like image. Is there any suggestions?
Generic adding components to LTSpice https://softsolder.com/2009/09/29/adding-a-device-to-ltspiceiv/
I found and saved the model from here. https://forum.allaboutcircuits.com/attachments/lm386-asy....
- 134k
6
votes
Accepted
If function error in LTSpice
The error is about exactly what it says: the conditional is defiend as if(a,b,c), and if you check the expression for BH with a ...
- 17.2k
5
votes
Why is capacitor discharge time higher when an LED is included?
If you’re putting the LED in series with the resistor then the discharge current will be significantly lower, and will drop almost to zero when the capacitors discharge to the forward drop of the LED.
- 5,350
5
votes
LTspice and op-amp strange behavior
V1 should be "+15V" in order to have -15V as a negative supply rail. Or you can have V1 at "-15V" and turn the voltage generator 180°. Post your graph when done
- 144
4
votes
Failed to find DC operating point for AC analysis LTspice
May I direct your attention to the second graph (updated version, simulation with positive feedback).
I don`t know if you are surprised about the results - because in reality such a circuit cannot and ...
- 22.5k
4
votes
Accepted
In LTspice, why does having these two transformer models create an error?
Don't put commas in your subcircuit names. Commas are special characters and count the same as a blank space in SPICE syntax, i.e. they both are used to separate out data fields. See Appendix 3 (...
- 2,039
4
votes
LTSpice RL circuit simulation with ideal inductor and inductor from database
My big suspicion is that your sine wave voltage excitation is initially applied when the sine wave voltage is passing through 0 volts. So, assuming that you are, the inductors in both scenarios will &...
- 378k
4
votes
Inconsistent behavior of MOSFET gate driver
Your inverter schematic is unusual at best. It looks incorrect (or making assumptions that aren't apparent to me) at first glance, but I'm going to ignore it for now.
The gate driver you have chosen ...
- 17.6k
4
votes
Model positive exponential current curve on LTSPICE
I thought I've give my own suggestion a shot since I never personally tried it, and also give an alternate take on "quick'n'dirty" approaches.
I used WebPlotDigitizer on your extremely low ...
- 2,039
3
votes
Model positive exponential current curve on LTSPICE
Before I say anything, I am trying to model this based on your first picture, annotated like this:
You say nothing about the first dip (at the first dotted red line), time or value. You also say ...
- 17.2k
3
votes
Accepted
LTspice-RIAA-simulation not working out
Your output "vinyl" mimics the gain plot of the preamplifier. You need to flip things around so "vinyl" has a lower output at low frequencies and a higher output at high ...
- 3,770
3
votes
LTSpice: Stochastic Input Parameter in Subcircuit
I see now. The problem is that the gauss() function cannot be called inside a .func, only in a ...
- 17.2k
3
votes
LTspice and op-amp strange behavior
You have added wire labels (F4) and, in the process, more than one net share the same label. The effect is you are shorting out those nets. Either delete the labels, or use unique names for each net. ...
- 17.2k
3
votes
Accepted
How to control/remove "quiescent current" of UniversalOpamp2
[Opamps]/UniversalOpamp[2,3a,3b] use VCSW as the output stage, and the quiescent current is directly related to the values of ...
- 17.2k
3
votes
Accepted
Failed to find DC operating point for AC analysis LTspice
Judging from the apparent topology of the circuit drawn around the opamp, I guess you are trying to make an inverting amplifier. If so, it looks like you simply connected wires wrong. The input ...
- 10.2k
2
votes
Accepted
LTspice AC Analysis extracting only the phase shift value at a certain frequency
The results of .meas scripts come out as a compact notation, so you can't separate them, at least not within LTspice. You can use the error log with external ...
- 17.2k
2
votes
How to input range of current values in LT Spice
I want my waveform to oscillate from 10uA to 10mA
That's a peak-to-peak value of 9.99 mA or, a peak value of 4.995 mA.
So, use two current sources in parallel; one set to produce a peak current of 4....
- 378k
2
votes
How to input range of current values in LT Spice
I would use a behavioral current source (bi in the components library)
The amplitude could be driven by a voltage source in PWL mode :
and then, the arbitrary current source (or here voltage source) ...
- 21
2
votes
Accepted
LTspice and op-amp strange behavior
You're powering the op-amp from 0V. Run a DC analysis and check the voltages on the power pins :)
2
votes
Same variables and different values on instances
These are the contents of the opamp.sub (installed by the LTSpice) file for an almost ideal opamp with two parameters:
...
- 6,093
1
vote
LTSPICE Dynamic Power / Voltage Slew Rate Controlled Source
As mentioned in the question's comments, you can leverage the UniversalOpamp2 component (found in the component library under ...
- 2,039
1
vote
Help with voltage doubler in a WPT application
The coupling between the two coils is very small. 0.089939 means about only ~9% of the flux from the primary coil is making it to the secondary. Try starting with a K = 1 for an ideal transformer to ...
- 11
1
vote
LTspice-RIAA-simulation not working out
I remember old vinyl pop-click, pop-click records.
The same curve appears at
https://sound-au.com/project06.htm .
- 2,179
1
vote
How to input range of current values in LT Spice
If you're referring only to your current source then what you ened is a sine with offset. So calculate it based on your maximum and minimum values, ...
- 17.2k
1
vote
LTspice and op-amp strange behavior
After many and many models tested, I finally found UniversalOpAmp3 that works exactly as I see with the real TL074 on a breadboard and, as far as I understood, an OP amp should work. At this point I ...
- 83
1
vote
LTspice and op-amp strange behavior
I noticed that your pin numbers are wrong and your sim program might not have a model of a TL074.
- 2,179
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