Quoted from dothedoo:
I tested the board last night in-game. Initial no-load power up reading was 4.37 volts. I tweaked the adjustment pot up to 5.01 volts and connected the MPU. It booted, but the voltage dropped to 4.5 volts. When I connected the other boards it dropped to 4.18 volts and would not boot. The highest it would go was 4.48 volts under full load and still wouldn't boot.
What else are you using for LM323K replacements?
I'm not surprised to hear this, but it's a bit disheartening you're also seeing the same with the PSU7. I have about 5 of them here when I was prototyping a Gottlieb power supply. None of them hit 5 volts for me. And they all dropped off well before the rated 5 amp load, when I was load testing them. I know my tester was a chinese 'no-brand', but I 4 different voltmeters that all agreed with each other. It's why I never released the design, and I don't know if I can use a 3amp regulator instead.
I have used the TO-220 sized regulators from EzSBC in the past, and while I didn't load test them, they did put out the advertised voltage on a quick voltmeter test. Maybe I'll order a few more pieces from them and load-test them as well.
The PSU-5 is a completely different regulator, and non-adjustable. If you're replacing an LM323 it may be worth looking at. The PSU-7 is intended to replace the 78H05 anyway.
Maybe I'll go back and chart this all again and talk to them. Seemed pretty responsive.
-Hans