From: matt (galaga_at_slingshot.co.nz)
Date: 2008-05-22 12:52:52
do you have to generate the sandcastle pulse?? _ | | _| | ___| |___ __| |______ ----- Original Message ----- From: "Hársfalvi Levente" <hlpublic@freestart.hu> To: <cbm-hackers@ling.gu.se> Sent: Thursday, May 22, 2008 8:09 AM Subject: Re: Multistandard composite to RGB board > Hi! > > > Well... indeed... > > ...Honestly, this one started off as something "simple" (find plans, > order PCB, buy components, put things together and move on... you get > the idea). But it just didn't work well... it needed fixing, some > enhancement, and at the end it got slightly more complicated than ever > expected, as much as I was just happy that it did work well (after > all)... Then I faced the fact that I didn't have more time and attention > to spend on the thingie, thus the compromise (no more work on the > design, but providing a fairly complete doc... from that on, the > possibility is there). > > For a production model, one would have to do a cleanup (do a less > complicated clock part, reduce the number of switches, invent a new way > of providing proper black level, finally, design a new PCB that fits in > some available housing)... In fact I've been thinking on a possibility > to mis-use an AtTiny25 as a PLL-alike clock synthesizer (I'm still not > sure that it's possible, but my nose tells me that it likely is). > Another small microcontroller could deal with sync and black level (thus > omitting both the LM1881 and the 74ls04)... this would make the design > more complicated, but would also make the final product smaller and > cheaper to manufacture (let alone the fact that it won't depend on the > availability of some esoteric values of crystal frequencies anymore... > :-) ). > > > > > MagerValp írta: >>>>>>> "HL" == Hársfalvi Levente <hlpublic@freestart.hu> writes: >> >> HL> Some months ago, I might have asked here whether someone knew of a >> HL> simple unit decoding more esoteric composite video signals (PAL-N >> HL> in particular) to standard RGB. I couldn't find a suitable design >> HL> back then (I could find things, however, that set me on track), so >> HL> I built one myself. Currently, it decodes PAL, NTSC, PAL-M, PAL-N >> HL> and SECAM from composite and S-Video to analog RGB (suitable for >> HL> displays with SCART socket, for example). >> >> That's a really nice design - I only wish someone would produce and >> sell them at a decent price. >> > > > Message was sent through the cbm-hackers mailing list Message was sent through the cbm-hackers mailing list
Archive generated by hypermail pre-2.1.8.