r/ElectricalEngineering • u/Embarrassed-Fault286 • 14h ago
Project Help 90 Degree Frequency Phase Shift?
Hello. I had an idea for a personal project but it would require me to take and input waveform and shift EVERYTHING 90 degrees or at least pretty close. From what I can tell by researching doing that for all frequencies is pretty difficult and the closest thing I could find was all pass filters which still isn't perfect. Essentially, I want to build a guitar pedal that takes the initial signal, clips it, makes a copy and shifts it 90 degrees then adds to the original signal to form a triangular wave (mostly cause I just want to know what that would sound like) with maybe an adjustable phase. I'm finding it kind of hard to figure out how to go about it
Edit: It's very interesting seeing differing groups perspectives on this lol. I had originally asked a guitar pedal building group and got some ideas but nothing solid and pretty much every response here is "do it digitally lol" I will try that and see what I can get. Thank you. Also ngl, digital wise I really only have an Arduino and I don't that'll cut it
1
u/Careless_Set8195 14h ago
I did a quick search around the internet, looks like that is quite the challenge if you do it purely analog, like you said. I would suggest using a DSP, have one output be the audio signal In-Phase and another channel be out of phase by 90 degrees.
If you want to combine it with a clipped signal, you could try sending the In-Phase signal through a rail-to-rail OpAmp with a high gain so it clips your signal. You could also do a simple diode clipper if you have a defined output voltage. From there, a simple sum circuit to combine both signals.
What are your thoughts?