Hey guys! Just a little backround, I am a student of E.E. working on some projects for my own learning experience. So I am building a circuit called a phasor for a guitarist buddy of mine. The idea is I have a buffer OP Amp(OP07 for low noise) that has its neg. feedback loop connected to 4 Dual OP Amps(8 stages in total). So my question is what kind of timing I should use. I need the signal to be 90 degrees out of phase. With the original signal passing through the buffer, would it be better to use a 555 timer to delay the signal or a 12 bit counter with an alternating reset voltage. Or any other ideas?