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Please help me to produce a particular Lissajous pattern in Cathode ray Oscilloscope

I have to implement a particular Lissajous pattern in C.R.O.The lissajous pattern is elliptical in shape (ie pattern due to some phase difference) and it should be moving in a circular path like a coin is tossed.ie the coin should move like a flipping coin(about an axis) in a circular path (that should be repeatable). there are several hint for this:

1) A dual Supply will be provided 2) programmable ICs are not permitted 3) XY mode 4) Only sinusoidals are used

Video and details are given in this link:

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Reply to
Ravi
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Sounds like "ohmwork"

Paul

Reply to
Paul E. Schoen

OK here's another hint, you can just make a circle on the XY scope by feeding a sine to the X axis and the cosine (90 degree phase shift of sine) to Y-axis. Make the ellipse flat or tall by changing amplitudes... make it squish along axis at 45 degrees to X-Y by changing relative phase.

Now it's your turn to add the coin bit.

George H.

Reply to
George Herold

Two oscillators.

Now, go read your textbook and do your own damn homework.

Good Luck! Rich

Reply to
Rich Grise

"Ravi"

** Requires 3 sine wave oscillators - one at a very low frequency like 0.25 Hz, the other two close in frequency at a few hundred Hz and with fine frequency adjustment.

A variable phase shift network for the low oscillator and two summing stages to produce the final X and Y signals.

All the sine waves could be derived by low pass filtering square waves.

Simple really.

..... Phil

Reply to
Phil Allison

Nah, he is posting on other news groups asking the same question. I suggest only supplying him wrong information.

Reply to
David Eather

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