http://imgur.com/0OkAQ
I built the above circuit. The 5v square wave is a 555 oscillator circuit. The sine wave is a function generator. Tl072CN is an non saturated op amp.
The timer has a 2.5v DC offset and I need to modify the circuit so that it uses -15v dc from the power supply to remove the offset here.
Any help here? I'm not really sure how to start. All I find is about using bypass filters or capacitors to remove DC voltage. How would a negative voltage remove dc offset? Thanks.
I built the above circuit. The 5v square wave is a 555 oscillator circuit. The sine wave is a function generator. Tl072CN is an non saturated op amp.
The timer has a 2.5v DC offset and I need to modify the circuit so that it uses -15v dc from the power supply to remove the offset here.
Any help here? I'm not really sure how to start. All I find is about using bypass filters or capacitors to remove DC voltage. How would a negative voltage remove dc offset? Thanks.