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Amiga computer related discussion => Amiga Hardware Issues and discussion => Topic started by: kreciu on June 24, 2016, 06:49:11 PM

Title: Amiga RGB to YPrPb - where can I get it?
Post by: kreciu on June 24, 2016, 06:49:11 PM

Can some one tell me where I can get Amiga RGB to YPrPb converter?

OR how to make it? :)

Something like this:

http://www.vintageisthenewold.com/amiga-rgb-yprpb-converter/

Thank you!

Title: Re: Amiga RGB to YPrPb - where can I get it?
Post by: Lord Aga on June 25, 2016, 10:48:41 AM

http://www.ebay.com/itm/NEW-SCART-RGB-to-YUV-Component-Video-Converter-Scaler-/221156873851

Since I was planing to buy it, I would love to hear your experience first :)

Title: Re: Amiga RGB to YPrPb - where can I get it?
Post by: kreciu on June 25, 2016, 11:58:54 AM

No, this is not what I'm looking for. I'm looking for AMIGA RGB to component. It is like nobody makes them... there is only AMIGA RGB to SCART (I can use SCART).

I'm using currently s-video + cheapo scandoubler ($10) from ebay.com and for games on LCD is quite good, but workbench looks BAD (text mainly).

Title: Re: Amiga RGB to YPrPb - where can I get it?
Post by: Lord Aga on June 25, 2016, 12:37:55 PM

It actually is. But you need another "middle man". And that is a common Amiga RGB to SCART cable. Plug the SCART end into this gizmo and you get a component output.

I know you would prefer a direct Amiga RGB to component output. So would I. But it seems that this is our only choice.

Are you (or anyone watching this) registered at that German forum64.de ? They have schematics attached in one of the posts. But I can't get to them.

Title: Re: Amiga RGB to YPrPb - where can I get it?
Post by: mindprober on June 25, 2016, 03:03:16 PM

http://gglabs.us/node/983

Title: Re: Amiga RGB to YPrPb - where can I get it?
Post by: hirschma on June 25, 2016, 03:41:50 PM

Wow, a version without connectors would cost just a few bucks to make up. Pretty simple design.

Title: Re: Amiga RGB to YPrPb - where can I get it?
Post by: mongo on June 25, 2016, 07:29:41 PM

Quote from: jdryyz;810342

http://gglabs.us/node/983

One problem with that design. Pin 21 on the video port is not -5v on all Amigas.

Title: Re: Amiga RGB to YPrPb - where can I get it?
Post by: hirschma on June 25, 2016, 09:31:17 PM

Quote from: mongo;810349

One problem with that design. Pin 21 on the video port is not -5v on all Amigas.

Not sure that I'm qualified to say, but it doesn't appear that -5V is actually required for that circuit to work. Perhaps someone that has actual EE chops can say.

Title: Re: Amiga RGB to YPrPb - where can I get it?
Post by: mongo on June 25, 2016, 10:52:38 PM

Quote from: hirschma;810352

Not sure that I'm qualified to say, but it doesn't appear that -5V is actually required for that circuit to work. Perhaps someone that has actual EE chops can say.

The OP amps use +5 and -5 volts.

Title: Re: Amiga RGB to YPrPb - where can I get it?
Post by: kreciu on June 26, 2016, 01:05:12 PM

Quote from: jdryyz;810342

http://gglabs.us/node/983

Thank you!

Title: Re: Amiga RGB to YPrPb - where can I get it?
Post by: kreciu on June 26, 2016, 01:10:54 PM

There are composite to HDMI and SCART to HDMI "scandoublers". I wish Amigakit.com would carry them as a cheap solution vs. internal scandoublers (even S-video solution would be nice to see, they are like $10 and works quite good).

Quality of Amiga RGB output is really, really nice and for games or some WB work would be sufficient. Not everybody need $140 dollars scandoubler (it is GREAT peace of hardware and quality is outstanding, no discussion here), especially new users.

Title: Re: Amiga RGB to YPrPb - where can I get it?
Post by: hirschma on June 27, 2016, 04:34:16 PM

Quote from: mongo;810354

The OP amps use +5 and -5 volts.

Hmm, not saying that you're incorrect, but where on the schematic is that shown? Totally not seeing any connection from -5V or VEE to any opamp.

Title: Re: Amiga RGB to YPrPb - where can I get it?
Post by: mongo on June 28, 2016, 12:05:22 AM

Quote from: hirschma;810387

Hmm, not saying that you're incorrect, but where on the schematic is that shown? Totally not seeing any connection from -5V or VEE to any opamp.

The power connections for the OP amps aren't shown on the schematic.

http://www.ti.com/lit/ds/symlink/lm6172.pdf

Pin 8 is V+ and pin 4 is V-.