how do oscilloscopes magnify frequency images?

Question

i made an oscilloscope out of an old telivision and i am getting some pictures but they are very tiny (the only things that i have plugged it into is the phone line and a mobile music player) how do you make the image big enough to where you can see the frequencies
(is it possiable or impossiable)

and does the frequency picture depend on the voltage and current you put into it

Answer 1

You need to run the signals through instrumentation-quality signal amplifiers to get enough voltage for a large deflection of the beams. That will make a bigger picture on the screen.

Answer 2

To drive the yoke coils on a television to make the image fill the screen you're going to need to employ an amplifier between your source and the coils. A low level drive like a music player doesnt provide enough current to provide full deflection of the beam in a cathode ray tube. An op-amp setup with an adjustable gain and a voltage dividing setup ahead of the amp would make a good setup. As far as the frequency, if you're using the horizontal drive provided by the television, this frequency is at a fixed rate of 24khz generally. If you want a different frequency, you could generate your own refresh and use the horiz yoke for your sweep