Ian Bonighton, Ring modulator diagram, 1969 <a href="/grainger/items/browse?advanced%5B0%5D%5Belement_id%5D=49&advanced%5B0%5D%5Btype%5D=is+exactly&advanced%5B0%5D%5Bterms%5D=Electronic+music">Electronic music</a> This is a diagram drawn by composer Ian Bonighton of a ring modulator, used in electronic music. Bonighton's 1969 Master of Music included a section on Electronic Equipment used in composition, and he included circuit diagrams of the ring modulator and theramin in the thesis. <a href="/grainger/items/browse?advanced%5B0%5D%5Belement_id%5D=39&advanced%5B0%5D%5Btype%5D=is+exactly&advanced%5B0%5D%5Bterms%5D=Ian+Bonighton">Ian Bonighton</a> Grainger Museum Archive, 2017/23 Ian Bonighton 1969