On 09/19/2018 03:30 PM, Bill Dromgoole via vcf-midatlantic wrote:

A step down transformer only changes the voltage. It does not affect the frequency. You are still running at 60 Hz.

To add to this, the computer hardware expects the TV to match the standard it's outputting. PAL - 625 scan lines, 25 Frames/s (50Hz) NTSC - 525 scan lines, 30 Frames/s (60Hz) Many computers send data to the TV while the scan line it written, while it goes to the next line, it's doing something else. The custom video chips are hard coded to these setings. While modern TVs may be able to handle this (some flatscreen TVs can handle PAL or NTSC) as it's just software. Older TVs were tuned for for the spec. If the PAL TV/Monitor were to get 60Hz it's 25 frames would be out of spec with the 60Hz. Grr, I'm afraid my explanation is a bit weak. But the 25 Frames/s and the 30 Frames/s rate would be out of sync with the change in frequency. The complexity of this has to do with the genius of goning from Black and White and handling color, in addition to the 50 and 60 Hz differences. A trip to the Sarnoff museum might be in order. At the moment I can't recall where I learned this but I'm pretty sure was related to my Atari 8 bit and Don Lancaster and his books. -- Linux Home Automation Neil Cherry ncherry@linuxha.com http://www.linuxha.com/ Main site http://linuxha.blogspot.com/ My HA Blog Author of: Linux Smart Homes For Dummies