poobah

I'd imagine all but the cheapest UPS would have some large caps on non-sinusoidal outputs to smooth things out. You cant send out unfiltered PWM power.

list updated

Best Electronics TT Diagnostic Cart v1.5 $25 shipped in the US Thanks!

last week before we move..... all reasonable offers accepted!

list updated

Not to flog a dead horse, but I didn't see anyone fix this... "Back in the day" our 15 kHz display devices expected more or less a 30 Hz interlaced NTSC-like signal. The odd frames would display 262(ish) odd numbered scan lines (1,3,5,...) The even frames would display the even numbered scan lines physically interleaved with the prior odd lines (2,4,6,...), the phosphorous in the display and the persistence of vision in our brains combined the two interlaced frames into a single 525 scan line frame at 30 Hz. However, our 15kHz devices of the day (ST's, A8s, etc) only had 240 (or so) lines of data, so they simply output the same frame twice, and didn't include the burst telling the display to switch between odd and even frames, which caused the display device to paint the the odd and even frames on top of each other, rather than interleaving the scan lines, giving a 60 Hz frame rate with half the vertical resolution. On CRT's you get the 'blank scan line' effect, because the electron gun never physically paints the 'even' parts of the screen! When you move to an LCD, doubler, or upscaler, each scan line gets repeated, 'filling in' the 'blank' even scan lines with a copy of the odd ones, resulting in an image where all the pixels are painted twice as high, with no vertical gaps. Whether this is an improvement is very subjective, however, it is substantially different from "no data".

list updated.

bump. Make offers, still lots left!

And some more good news.... The NEC 1970 NX appears to be the same monitor with an integrated USB hub. Grabbed one for testing, It performs identically to my 1970VX

So I grabbed a 1970VX: The good: Make a cable, plug it in, it works. Displays low & medium, easy to adjust to full screen, 50 and 60 Hz work great. I haven't tried mono yet. The not so good: The scaler is pretty bad. Medium res is a mixed bag, it's difficult/impossible to get the image lined up so all the pixels show correctly (Capital M's are particularly bad). It seems to throw away columns that don't map well, I think it may be worse than the cheap chinese gbs cards on ebay. Bottom line, or $20-30 bucks, it beats lugging around a multisync 2D, but the image quality is so-so Edit: So, an update, hooked it up hi-res, needed to adjust the screen a little, but it looks really good.

I have a BenQ G2420, it doesn't like the ST.

List updated!

I tried several different versions of these, they all suffer from various distortions. If you really want to use one, you need to to fix up the ST hsync and vsync signals before feeding them to the board. I had better results with an AD724 s-video encoder.

bump moving right at Thanksgiving, scope needs a new home!

bumpity-bump.... Moving at thanksgiving, need these to find new homes!

updated list reasonable offers accepted!

Updated List

The box is about 6" x 8", I'd call it the small format box.

bump

bump

bump

pre-ebay bump

pre-ebay bump Thanks!

bump. list updated.