This is the circuit that many old guitar phase padals were based on. Ian Ken Smith <kensmith@rahul.net> wrote in article <72arkj$8ma$1@samba.rahul.net>... > In article <7272ee$k47$1@news1-alterdial.uu.net>, > Geo <Gmarutz@teleweb.net> wrote: > >Is it possible to design a phase delay circuit for audio that would allow me > >to vary the phase of a 4Vp-p signal 0-180deg without affecting the signals > >amplitude? Possibly user input through a multi-turn potentiometer? > > > >If you have some ideas please share them. > > > ASCII ART: > > R1 R2 > --------/\/\/\/--------------\/\/\/\---------- > ! ! ! > ! ! ! > ! !---!- \ ! > ! ! \ ! > ! ! ---------- > ! R3 ! / > !-----/\/\/\-----------!+ / > ! > ----- > ----- C1 > ! > GND > > If R1=R2 this circuit has equal gain at all frequencies. At the frequency > given by 1/ (2 * PI * R3 * C1) the phase shift is 90 degrees lagging. > > -- > -- > kensmith@rahul.net forging knowledge > >
Date: 14 Nov 1998 19:18:46 GMT
Original Subject: Re: Help - constructing an audio signal phase delay.`