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You need 2 transistors to amplify the positive and negative side of the sinus. You just give a little bit information, I dont know what your purpose it. You can"t expect that we can just post the right schematic.
I think I would go to radio shack and buy an lm386. https://www.electro-tech-online.com/custompdfs/2010/07/LM386-1.pdf
Use the diagram for the X20 amplifier and put your coil where the speaker is. You might want to make the 250 Ufd. capacitor larger (500 ufd.).
Maybe something like this?
**broken link removed**
, replace the LS1 with ground. You can set the amplification with the resistors R9 / R10 ( not inverting amp) . You wont have crossover because the polarisation with the diodes. I think you can set your coil in the collector branch with a diode across .
hi kattoju,
If the coil resistance is 400R and it conducts 8.2mA, means the voltage source is normally 3.28V
If you require to drive 30mA thru the 400R this would require a voltage source of only 12V, a 30V source would drive a current a current of 75mA thru the coil.
These figures do not include the coils inductance, which you have not defined.???
Why not use an audio amplifier IC?