I want to change a constant-amplitude sine wave(or any periodic wave) to variable-amplitude sine wave. For example a 1 Khz sine wave must have 4 V amplitude for 10ms duration and 8 V amplitude for other 10 ms duration like in the attached figure. I think this is called signal modulation. But I dont know how to setup a circuit that enables me to do it. I am not allowed to use IC's except 555 and 741.
Thank you for your answers..
Thank you for your answers..