I recently got this weird thing handed down to me. A ShibaSoku 251P/1 "FM Modulator". Now, FM modulator sounds useful, doesn't it? But it looks like it was specifically designed for use in the mastering process of Laserdiscs. The two audio channel inputs and gain settings suggest this. However, feeding signals into it and looking at its spectrum, there is nothing where the audio channels should be and a peak around 7.65Mhz, which is a bit off from where the video carrier for PAL should be at 7.1Mhz. It also has a "CW" input, which one would assume is to modulate an arbitrary carrier wave. But no dice trying to use that either. Really odd. Maybe it's just broken. Any ideas what to do with it? Any more information on it?
Does anyone want it for its intended purpose? Otherwise it will become a project box.
More on laserdiscs: https://www.domesday86.com/?page_id=1379
Does anyone want it for its intended purpose? Otherwise it will become a project box.
More on laserdiscs: https://www.domesday86.com/?page_id=1379
It left out the magic smoke. The seller said he taped it shut to keep the special aroma in. I guess we all know what happened.
Whatever the engineers that designed this had on their minds, ease of serviceability was not among that. To even open it, to have to pull ten screws out. To take the mainboard out, to first have to remove the left floppy drive. And there are washers between the board and the screw posts, which are of course fiddly to get back in