Coil Driving Circuit

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hello,
i need design ac driving circuit coil, in order generate small magnetic field. circuit should allow user change amplitude , frequency of alternating current, flows coil. i'm beginner electronics, can show me simple circuit so?
thank you.

marc

you should post required range of amplitude, frequency , current.  details important.

what trying do?  there may better/easier way pulsing dc (pwm).


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