Hello,

across my searchs over internet, i found this schematic coming from here :

do you know if it's fully functionnal or are there any other revisions?

also i see diodes are needed, two type of diodes apperently, do you have the name of those components?

thanks in advance

I don't see 2 types of diodes in the schematic... I see the zener diodes (D1, D2, and D3) and what look like inverters driving pins 13 and 14. I hope those are what you are referring to. You should be able to use any simple inverter chip that can handle 5 volts.

thanks for fast replying, yes that's what i do refer, any inverter chip to recommend?

i'll build this converter to be able to use my ps3 on a crt monitor.

I am also wondering about this, what inverter chip should I use? Or can I use another option for inverters?

colmania, I'm not sure if you got the answer(s) you were looking for. From my research I believe the zener diodes are for ESD protection from when you plug and unplug the cable so that you don't damage the circuitry. My guess is that these are unnecessary on the inputs because they have them built into the chip for all the inputs.

Take a look at the spec sheet for this chip at national's website. What it boils down to is YPrPb uses positive edge for sync locking and VESA uses negative edge, the inverters are there to make it VESA compliant. However, the data sheet goes on to say that some display drivers may have the inverters built into their sync signal inputs in accommodate for either negative or positive edge sync signals. I know I tried another Comp->VGA converter and I didn't need these inverters. If you need them make sure you buy/sample an inverter that can switch faster than the sync signals themselves. I think if you get something more than 1MHz you should be fine for SDTV (but don't quote me on that).

I'm looking at building a converter box with this exact chip (already have samples) and will be posting my experience. If you've done anything I'd love to hear about it.