Recent content by techknight

Yeah... Except theres no shorts. the PSU just wont start. Either PSU that is. Found a reddit thread where someone had the exact same problem and it had no conclusion until I necro'd it. He mentioned he solved it and the ESR of the caps were too low and causing it to not start. Interesting, but I...

The problem is MOQ being 5. id rather jump in on an extra you or someone has, so unfortunately that doesn't help me. Anywho, my own personal grievences aside, Amazing project. I am glad someone took on the project that I was absolutely dreading...

If you have any extras populated with the birdseed let me know, id be interested in one to see if it solves a problem ive been beating my head against the wall with.

I just recently discovered this project, and I got shipped 4 analog boards which are the worst boards of my life thus far. So many oddball issues. Anywho, I second the decision of figuring out alternative power solutions. Case in point, ran into a VGA modded board which blew its transformer...

CRTs have a maximum deflection angle. usually from 70 to 110 degrees or so. The yokes are matched to the CRT, because if not youd get strange behavior. For example, using a narrow deflection yoke on a wide deflection CRT would result in the picture being too small and not fill the screen...

Yoke is slid too far back. the CRT neck is blocking the beam, or the wrong yoke is installed and it has the incorrect deflection angle.

As seen on discord:

The Portable is a unique beast because all the voltage regulators take its reference point at the battery, and NOT the AC Adapter unlike the PB100 and newer. So the battery itself becomes the reference and also the battery becomes part of the regulation loop. If its out, well... the 1.5A AC...

I ended up fixing this machine, and the more I dove into it, the more I realized that I think someone shoved a 12V or even a 19V adapter onto this thing and blew it all up. Even the inverter had a blown winding in the transformer.

Its the batteries. NiCd/NiMH/Lead Acid batteries want to consume as much current as it can when deeply discharged to start building a charge. The circuitry in those early machines arent smart enough to provide current-limiting of its own. So the higher the AC adapter rating, its gonna try and...

Missing one-half of the waveform. Either the upper or lower transistor failed in the audio output stage, or you are missing the -12V.

They're sapphire point bearings, it allows the ball to roll around smoothly.

Woah this is amazing! PLEEEEASE Add the portable!

Here they are:

Pretty sure I have the schematics and PAL code (on hardcopy) for this card. I cannot recall if i ever made that public or not. I think i may have on the Discord.