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Hi Jerry

That is a myth. Indeed, switching at 0, in a non-intuitive manner, produces a large current because the 1st derivative of voltage is at its peak. Since dI/dt is proportional to voltage, the derivative

Also, if you delay the sine by 90D so that the wave starts at the peak, you wont get that 1st half cycle thump that transformers like to do. Al D.

Got it working. Thanks, Chris KQ6UP

Chris, You can use either a BV source or a modulate component. Both of these are covered in the LTspice help file. Rick

Peter, If you use .trans ts iuc, the initial currents will be 0 and the energy stored will be 0. If you see that, it is correct. There is no lost energy in any real circuit. Rick

There is a built in 'modulate' component. If you search the group files, you will find lots of discussion about DIY modulate. Sent: Wednesday, January 08, 2014 3:29 PM To: LTspice@...

I would like to make a perfect AM signal using two sine voltages. I realize if I was able to multiply the value of the RF signal times the value of a DC offset AF signal, I would have a perfect AM

Hi Guys, It is useful to do a small math analysis on the system of differential equations of the transformer and to compare it with LTspice simulation result. It looks like the right set-up is: .tran

Hello John, I never thought about this before and indeed it's not possible to get the V-probe when moving the cursor over the opamp. You could subtract the noise from all resistors (here R1, R2, R3)

Hello Brian, Please try the following. Delete the diode(s) and add a "fresh" diode(s) in this schematic. Best regards, Helmut

Brian asked about a problem where LTspice tries to access directories on his C: drive: "Fatal Error: Could not open library file "C:\Program

When doing a noise analysis using a macromodel for an opamp is it possible to plot the noise contributions from the subckt? I am able to plot noise from each resistor at the top-level and the total

I'm getting an error message on an old circuit as follows:- Fatal Error: Could not open library file "C:\Program Files\LTC\SwCADIII\lib\cmp\standard.dio" My installation is on

Hi. Here is my upgraded model. Try to use this model: .SUBCKT MCP6291 1 2 3 4 5 ;my * | | | | | * | | | | Output * | | | Negative Supply * | | Positive Supply * | Inverting Input * Non-inverting Input

Andy, You didn't read my response very carefully or completely, but it is exactly correct. Rick wrote: ? ? "If the source voltage is not 0 at time=0, you will have an initial current in the

Nick wrote: "I get this weird thing that happened when I simulated a mains transformer. When I view the current of L1 it does not alternate, meaning change direction. The Raw file shows a sinusoid

Nick, If the source voltage is not 0 at time=0, you will have an initial current in the transformer. This is because for a transient analysis SPICE computes the DC operating point of the circuit at

Did you add an offset voltage of one-half the peak to your voltage source?

I get this weird thing that happened when I simulated a mains transformer. When I view the current of L1 it does not alternate, meaning change direction. The Raw file shows a sinusoid plot, but above