Greetings. I want to get an Apple RGB color monitor for my IIgs. They are very hard to find in the EU area, with EU 220-240V specs. So I was wondering, is it possible to get one meant for USA market, 110-120V spec, and mod it to 220-240V? What would that entail? I know I can use a step-down transformet but I would like to do a permanent internal mod. Is it possible? Are there any guides etc around? Thanks for your answers.
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It might be easier to get a IIGS to SCART adapter cable, or just build one yoursef. Then you could use any monitor with a SCART connector, or a SCART to HDMI and use it with a flat panel.
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Based on this page from the IIGS monitor operating manual, the IIGS monitor will work at 108-132 VAC with 50 Hz as well as 60 Hz. If you have a US version of the monitor that is designed for 120 VAC, you can probably use a 220 to 120 V transformer to power it as the 50 Hz frequency appears to be ok. It uses 90 W peak and 65 W average according to the manual, so a 100 W converter should be more than enough.
I do not think you will find a simple tap on a transformer you can adjust. Items like the flyback transformer are designed for the particular line voltage and I don't think are adjustable that way.