mif_tronics
New Member
i m trying to make an AM modulator using 2N3904 (common emitter, A class)but i dont know how to set the operating point in both AC and DC analyze. i need to modulate an small AC signal at about 38-42 KHz (on transistor base) and mid AC signal of 40KHz(on emitter) to get a beat frequency between them. i work on 12V power supply. is there anybody can help me?