Multistandard PC/TV - What Next? - UK Vintage Radio Repair and Restoration Discussion Forum

Kat Manton · 14th May 2006, 1:59 pm

Hi,

After completely exhausting myself in the weeks leading up to NVCF trying to get something ready in time, I'm taking a short relaxing holiday inside Russian portable radios

I think the next thing that needs to happen is to get some sort of website up and running; Paul Stenning has generously offered space and help with this. A lot of the sort of questions that keep cropping up could be better dealt with on the website, so that's probably the first priority.

Next up is likely to be a further refinement and simplification of the RGBHV/composite converter circuit; along with laying out a PCB for it. I have some ideas for this which I'll be trying out once my Riga 103 is back in one piece and I can clear my bench again

I'm considering a few variations on the circuit:

Basic circuit which just converts anything fed in to composite monochrome, with XORed syncs.
Advanced circuit offering proper regenerated syncs, and automatic disconnection of the composite output if the input timings go out of range, possibly switching to an additional HD-15 connector so a PC monitor can be connected up.

I'm looking at making provision for other standards; particularly 441-line and 819-line; this may require little more than ensuring the video bandwidth is at least 10MHz for 819-line; though generation of proper syncs for other standards needs investigating.

So; what would you be interested in? Would there be any interest in a PCB that just needs components fitting; or a complete ready-to-go built-up unit? Basic XORed syncs or proper syncs to the specification? Additional standards? Protection from out of range timings?

Comments and suggestions welcome

Regards, Kat

oldeurope · 14th May 2006, 6:05 pm

Hi Kat, I think if you decide to make a PCB you should make a correct V-sync.
The XOR is to make a simple hand wired experiment. Making a V sync is much
easyer than you expect. Look how it is done in my converter.
How does your current state schematic look?

Kind regards
Darius

PS: I've seen your pics from the NVCF here. Looks good!

14th May 2006, 1:59 pm	#1
Kat Manton Retired Dormant Member Join Date: Jul 2005 Location: West Yorkshire, UK. Posts: 1,700	Multistandard PC/TV - What Next? Hi, After completely exhausting myself in the weeks leading up to NVCF trying to get something ready in time, I'm taking a short relaxing holiday inside Russian portable radios I think the next thing that needs to happen is to get some sort of website up and running; Paul Stenning has generously offered space and help with this. A lot of the sort of questions that keep cropping up could be better dealt with on the website, so that's probably the first priority. Next up is likely to be a further refinement and simplification of the RGBHV/composite converter circuit; along with laying out a PCB for it. I have some ideas for this which I'll be trying out once my Riga 103 is back in one piece and I can clear my bench again I'm considering a few variations on the circuit: Basic circuit which just converts anything fed in to composite monochrome, with XORed syncs. Advanced circuit offering proper regenerated syncs, and automatic disconnection of the composite output if the input timings go out of range, possibly switching to an additional HD-15 connector so a PC monitor can be connected up. I'm looking at making provision for other standards; particularly 441-line and 819-line; this may require little more than ensuring the video bandwidth is at least 10MHz for 819-line; though generation of proper syncs for other standards needs investigating. So; what would you be interested in? Would there be any interest in a PCB that just needs components fitting; or a complete ready-to-go built-up unit? Basic XORed syncs or proper syncs to the specification? Additional standards? Protection from out of range timings? Comments and suggestions welcome Regards, Kat

14th May 2006, 6:05 pm	#2
oldeurope Retired Dormant Member Join Date: Dec 2003 Location: Solingen, Germany Posts: 727	Re: Multistandard PC/TV - What Next? Hi Kat, I think if you decide to make a PCB you should make a correct V-sync. The XOR is to make a simple hand wired experiment. Making a V sync is much easyer than you expect. Look how it is done in my converter. How does your current state schematic look? Kind regards Darius PS: I've seen your pics from the NVCF here. Looks good! Last edited by oldeurope; 14th May 2006 at 6:13 pm.