PSOne Screen Working!!!

[Hodgkinson]

I’ve tried tinkering with those PSone displays, and if im right, I think they need RGB and sync to operate - Check the hardwarebook for the pinout of the connector.

Don’t just use batteries!!!
As they discharge you're going to get all sorts of errors and malfunctions as the rails start to drop. At the very least, you need to have batteries with voltages above that of the rails which you intend to supply, then regulate the rails down with linear regulators. Some kind of alarm would be prudent to warn you when the cut-off point of the regulators has been reached (E.g. Their output starts to fall too).
I'd probably use an 18v battery pack and linear regulators to supply the necessary rails. Don’t forget - Amiga's also require a negative (-ve) supply rail, too.
A better and more energy efficient solution would be to use some kind of buck/boost converter system (Which I presume is used in laptops) to maintain the rails from a wide range of battery voltages; however that can be complicated and ready-built units of the sorts of current ratings you would require are expensive.

Hodgkinson.

EDIT: Amigas are just as sensitive to supply rail regulation as PC's, you know. +/- Half a volt can make a huge amount of difference.

[Hodgkinson]

That's the kinda thing I was thinking of. Mind you, 0.5A max doesn't leave much room for add-ons, unless you powered different sections from its own converter, which is inherently risky. Oh, and a -ve rail still needs to be generated - I think there's switching converter modules available that will produce negative voltages, too.

BTW, A Switching regulator, or step-down converter, as opposed to a linear regulator, should yield better battery life and efficiency, since rather than just *dropping* the voltage and dissipating the energy as heat (V*I=W), switching regulators actually "transform" (Or at least use PWM) it as such, meaning that with fully charged batteries, you should, in theory and with 100% efficiency, be dragging less current from the batteries than the combined output of the switching regulators. :-D

[Hodgkinson]

When I tried the PSOne screen that I got, although it did work and was easily readable when operating in the low res mode of WB, high res became somewhat harder to read (You had to have a prior insight as to what the buttons said).

Also, for some reason mine had horizontal lines across the image and the built-in speakers didn't work. But I've got a feeling that it might be because everything else that I bought from the bloke was faulty, too. :madashell:

[Hodgkinson]

Don't forget, regulators usually need an overhead of about a volt or two for operation, and you need to allow for the batteries to discharge, so I'd say at least 18 volts of supply for a decent period of operation - Then step this down to the required +5v and +12v.

For the -12v rail, you could use another pack of batteries but that would be really overkill, as (If im right) it’s only used for some of the ports on the back. I’m sure DC-DC converters are available that produce a negative rail from a positive rail, so one of them might be best to supply the -12v.

Everything shares the same ground rail.