# how can i produce a fliping coin like movemnet to a lissajous pattern ( a circle) in oscilloscope?

Is it possible to make a circle like lissajous pattern to move in the oscilloscope screen in a circular fashion along with it, that circle like lissajous pattern should rotates in its own axis like a fliping coin.. how it is possible.. can i do this as a hobby project. Give sugeestions and help me make its circuit... please!!!!!!!!

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orksecurity8 years ago
You get a circle by feeding a wave to both horizontal and vertical deflection, suitably out of phase with each other. Right? Now if you vary the amplitude of one of those, you'll make the circle grow and shrink along just one axis, Do this regularly, varying between 0 amplitude and that which produced the circle, and you'll get the appearance of a flip or spin. Or, you could vary the phase of the two signals, which would cause the image to shrink and grow along one of the diagonals. So the simplest thing to do is to have two oscillators which are almost-but-not-quite tuned to the same frequency. They will thus drift into and out of alignment, producing the latter kind of tumble. Rate of flip should be the beat frequency between the two sources. Obviously, other frequency relationships between the two osc's will produce other lissajous figures, with similar kinds of motion unless the two are locked to each other. Hook it up, grab a few knobs, and have fun playing... Now make it "wink" by putting one of those signals through an amplifier stage whose gain varies from 0 to unity, under control of
8 years ago
Sorry, a few typos in that... Meant to remove the last sentence, and the first should have said "sine wave" rather than just "wave". That's what I get for typing when half-asleep.
steveastrouk8 years ago
No, Its 1:1 for the effect they want I think, with phase shift, and probably about A/2 on the B axis
8 years ago
doh...my bad...yes, phase shift, not freq...
steveastrouk8 years ago
Yes, its very easy, you need two sine wave generators, one with a fixed frequency (50 Hz will be fine) the other variable from 50 to 200 Hz. You need to be able to alter the phase slightly too. Stev