kevman3d wrote:That's really cool and thanks for posting it up! Its the one part of the 3000H here that is actually missing (apparently it was faulty, so father-in-law threw it in the bin rather than leaving it in the machine )
How hard is this to construct? The only reason I'm asking is that while I can work out what's going on with your diagram using my very primitive knowledge of electronics, I'm not sure if I could build something without seeing a physical unit in detail.
Which make/model TVs have you tried that it does work on?honestbob wrote:One thing to note is that it won't work on all TVs. Some newer TVs can't handle a 288p signal over component
kevman3d wrote:Quicky Q... Has there been any update on your PCB Daughterboard project? Thought I'd just pipe in and bump the thread.
I'm actually going to have one last go at a couple of alternative designs on the breadboard first to see if I can do anything with the faint jailbars on my LCD TV and I'm waiting on some parts from eBay. Going back to a sample-hold circuit, and putting the signal scaling prior to the amps. Then going to try pure op-amp design vs THS7314 (with 5th order butterworth filter) and THS7374 (with optional 6th order butterworth filter) again to see if there is any difference. The THSxxxx design requires a 5v regulator on the daughterboard though because the connector from the SC-3000 only feeds +9v (actually around 10v with 2v ripple) from the power brick. The op-amps tolerate that, but not the THSxxxx chips. I want to do that so the daughterboard is plug and play and you don't have to solder a 5v feed from the motherboard.
honestbob wrote:Hi All
Here's a draft pdf of my latest Sega SC-3000 component video daughterboard design. It performs just as well as the previous one, but it is a lot simpler.
http://www.sc3000-multicart.com/downloa ... EagleD.pdf
ti99user wrote:honestbob wrote:Hi All
Here's a draft pdf of my latest Sega SC-3000 component video daughterboard design. It performs just as well as the previous one, but it is a lot simpler.
http://www.sc3000-multicart.com/downloa ... EagleD.pdf
Great work. Can you share your Eagle files, too?
That should solve the wrong colors on my experiments I worked on with the TI99/4A (which also uses the TMS9929A). Especially e.g. Parsec has a blue instead of black background.
Thnx.
ti99user
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