History of the Shin Ei Uni-vibe The Uni-vibe was developed by the company Shin Ei in 1968 by engineer Fumio Mieda. It was meant to be a Lesley simulator but sounds more like a phase shifter device as it is based on phase shifting technology. The Uni-vibe was one of the first phasers available in the market. The major difference with a standard phaser (e.g. MXR Phase 90) is that the four phase shifting stages have a different setting making the “wobble” sound more musical. Notable users of the Uni-vibe are Jimi Hendrix, Robin Trower and David Gilmour of Pink Floyd. The real Uni-vibe sound can be heard on Robin Trower’s “Bridge of Sighs”, Jimi Hendrix’s “Machine Gun” and Pink Floyd’s “Breathe”
Technology concept The Uni-vibe is a 4 stage phase shifter device implemented with discrete transistors and 4 phase shifting stages based on variable RC filters build up of a capacitor and a Light Dependent Resistor (LDR). The value of the resistance (LDR) is varied by means of a light bulb with varying sinusoidal intensity and thereby creating the phasing effect.