I had intended to post this thread under my CD4-10s project, but I figured that since it could apply to anyone who buys Japanese gear that runs on 100Vac and does not have a voltage select option. This mod allows me not to have to use an external voltage converter. All you need do is select a 120V to 20V transformer of the correct VA. The transformer can be placed inside, like the CD4-10 that has room, placed on outside the back of the case or put in a separate box. The PDF file shows the schematic and a brief description on how it works.
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Before Top.jpg61.2 KB · Views: 146
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Before Side.jpg72.4 KB · Views: 155
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120Vac In, 100Vac Out.jpg102.6 KB · Views: 163
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CD4-10S, Schematic, 120Vac to 100Vac Bucking Transformer.pdf227.3 KB · Views: 122