I am using the core of a broken flyback that I removed
You have to have enough turns on the primary, but not too many. You need to assess the drive frequency you are using and ideally know the material that the core is made of. Too many turns, the core will saturate and your drive transistors vapourise....
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It is made of ferrite, i will tell you the size later. thank you please answer!
Drive it with a few turns wrapped round it from a variable frequency oscillator, and measure the current in the coil. Get an oscilloscope to watch the voltage and the current.
It all depends on what you are doing with it. So, What are you planning on doing with it?
i am using it to power a voltage mutipiler. The flyback was the type with diode and varaible resistors built in.