Hi Declan, > Recently, Somebody Somewhere wrote these words >> Hi Declan, >> >> if you graphics card can support the slightly different timing of the >> Mac, you might be lucky. My first color monitor was a NEC 3D (which >> after 15 years is still around - after 4 years the fly-back >> transformer exploded, but who cares, monitors were still expensive in >> 1994...).
> Timings different? My video card was always held on a tight rein to > support the monitor :-/. I can look the specs for my old NEC up (still have the manual) up. Otherwise someone else might know the frequencies. I guess it's easier to connect a modern multi-frequency monitor to a Mac than a Mac monitor to a PC graphics card - but as you already heard, a more modern, second-source Mac monitor might be able to do more than it was originally supposed to do. >> Now I have to build an 300V + 6.3V supply to get it working again - a >> nice challenge would be: a switch-mode power supply to drive a tube >> oscillator ;-} > I have got depressed looking into Japanese Forklift boards. I no longer > count a smpsu as a challenge, because they throw on a chip (uPC494 or > MC33068), transistor, diode, inductor, and the odd electrolytic and they > just work - they _hardly_ever_ blow. Some boards have 5 and I have to > point them out to people, they are so small. The board with the sits > (remember those?) has + and - 7.5V from 48V or 80V with up to 400V load > dumps. > Use the uPC494 (or TL494), a fet (e.g. IRFP450), a diode (schottky if > you're brave), 150 - 330uH, and a capacitor. That's their recipe - all > voltages, all currents. Or you could just buy a heater transformer - > there must be 220V around somewhere. I have plenty of those controllers in a couple of salvaged PC power supplies. But I also found that our major electronics distributor here in Sweden still has new "anode" transformers with the correct windings - this will leave me with the design of a linear 300V regulator from the rectified transormer output. Shouldn't be too complicated. Uwe. -- Author: Uwe Zimmermann INET: [EMAIL PROTECTED] Fat City Hosting, San Diego, California -- http://www.fatcity.com --------------------------------------------------------------------- To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB CHIPDIR-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing).
