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PWM, PAM, PPM using IC 555

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sir! i need help. the output i'm getting is a PAM wave but the negative half cycle is clipped. :( i hope you reply asap. i'm kinda noob in electronics. thanks.

add some amount of dc offset in audio signal

 

how can i feed the digital pam output into a wire for transmission?

 

sir,

     how can i find 1N4009 diode?

Could this be inpletmented to control certain angles in a actuator through a relay?