Guitar phaser effect

Posted on Feb 5, 2014

Each CdS cell acts as a variable resistor in a single variable phase-shift circuit and there are six such individual phase shifters arranged in series, each increasing the overall shift. The LED`s brightness is modulated by an oscillator (bottom section of the circuit) whose frequency can be adjusted by the Speed pot. Max and min illumination are

Guitar phaser effect
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adjustable - the LED should not extinguish. The LDRs control the shift of the six stages of the phase shifter. This phase shifter has overall feedback, varied by the Intensity control, to alter the intensity of the phasing effect by altering the overall phase shift. Apart from that, there is an input buffer (top right) whose output feeds the phase shifter and also feeds through to the mixer stage where it is mixed with the phased signal. I hope there are no errors in the circuit but it is given as is, without any obligation but of course we will answer all reasonable queries. Unfortunately I have been out of audio for some time now so cannot give too much assistance. Modern phasers will use a digital delay line circuit, but this discrete version works and illustrates all the principles involved.

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