Ok i applied 12vdc supply with 5v ac (AS AC1)
THEN 100khz-10mhz pulse adding ac2 at base of transistor thru 47k resistor and got the circuit working..now what ?
Hmm, I thought I recognised that circuit! If you want to know the frequency response you had better draw it correctly first. As it is, it doesn't make sense and so probably won't do what you want.
Also, an AC analysis would be used to normally find the frequency response of a circuit but that is a small signal analysis. You are talking about a square wave input so it cannot be done that way. You could step the input frequency in a transient analysis.
Rather than getting someone else to do the simulation it would be better to learn how to learn to use the tools you have. I believe LTspice has a decent help system. Hit F1 or select 'help' from the menu and look up how to do an AC or transient analysis.
One problem (other than what I assume are drawing errors rather than 'design changes') is that you have an AC source for the power supply. That should be a DC source and you need an AC source for the input signal. However, that would not work as the circuit stands answer there is no bias to the input transistor (which I assume would be a phototransistor). It would probably make sense to bypass the first transistor and put an AC source to the collector.
Keith
And other errors that have been previously mentioned.You do need to fix the drawing errors for the simulations to be useful. For example the original circuit had a long tailed pair output stage (i.e. emitters connected) - you haven't.
Ok thanksdselec,
If you look at this post https://www.edaboard.com/threads/20670/#post1032828 my post should make more sense.
Keith
Ok thanks
Now i understand where /what he is doing so since it was your post first u can point out to him his circuit errors
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