Installing and using LTspice IV (now including LTXVII), From beginner to advanced

[jan.didden]

Hi Ian, yes I did something similar, but don't know how to get 'kHz' on the X-axis instead of 'kV'. Not critical, but would be nice ;-)
I also changed the FM input source to a PWL wave; using a Pulse here feels a bit awkward.

I'm setting the X-axis to V(swpend)*1kHz/1000V and it will show the frequency correctly.

Jan

 

[jan.didden]

Ran out of edit time:

Jan

 

[Mark Johnson]

I'm setting the X-axis to V(swpend)*1kHz/1000V and it will show the frequency correctly.

What a clever way to convince LTSPICE's axis labeling "automatic detection of units" code, that your axis is hertz instead of volts. Congratulations!!

 

[jan.didden]

Actually, I got idea after reading Ian's post above. But yes, it's nice to see it all come together!

Jan

 

[FdW]

As time can be used as part of your formula's (creating voltage sources) you can use something like this here (or any other non linear formula you prefer)

 

[jan.didden]

Frans, you are in a class all by yourself!

Jan

 

[FdW]

Makes you wonder, what may that class be
Thanks Jan

 

[RCruz]

A really special high class it is.

 

[FdW]

This is a bit to 'open ended' for me, so here is a workable solution

View attachment Ramp.zip

 

[RCruz]

One more for my FdW sim collection.

Thank you so much Frans

 

[Osvaldo de Banfield]

Hello all guys.
Is there a way to simulate a potentiometer (not rheostat)?
How do I simulate a log pot?
Many thanks in advance.

 

[Mark Johnson]

Could you use a parameter? R1's resistance is {10K*ppp} and R2's resistance is {10K*(1-ppp)}

 

[dotneck335]

You could try this for a 100K log pot (see attached .asc file)

 

[FdW]

Here is a potentiometer, can be used with constants, or stepped, or voltage controlled as here.

v10 = psu
rr = potentiometer percentage as a voltage 0...100%
rt() formula for resistor at top
rb() formula for resistor at bottom
the formula input parameters are r=resistance, p=percentage
bt = resistor at top
bb = resistor at bottom
the resistors are created by using a current source, where i=v/r
tt, tc and tb are trimmer top, center and bottom

Have fun,
Just remember, Ohm's law solves most of your problems

p.s. the if(...) statement in .func rt(r,p) {(r/100)*if(p==0,1u,p)}
and .func rb(r,p) {(r/100)*if(p==100,1u,100-p)}
prevents zero Ohm as a value by substituting it (zero) with 1u

 

[kees52]

Hi All


Why I get no output from the flipflops?.

It has 4 Mhz in from cristal 5 volts peak.

Using .inc 74hc.lib.

regards

 

[djoffe]

try setting pre and clr high.

 

[dotneck335]

Here is a potentiometer, can be used with constants, or stepped, or voltage controlled as here

Your graph clearly shows a LINEAR transition, not a LOG one.

 

[dotneck335]

Here's a better transition.
But I cannot get LTspice to plot R (rotation %) versus voltage out. ????? Suggestions?

 

[Osvaldo de Banfield]

What if none of the extremes of the resistance nor the wiper is grounded? What I want to simulte is a Baxandall active tone stack. In these cases no grounded pin is available.

 

[dotneck335]

Here's a Baxandall tone circuit. Works fine with linear pots, but log pots screw everything up.