1541 PSU + 4th core (inside)

Originally I though to keep the PSU and 4th core separate (like when the PSU and the external unit were in separate boxes), so that the PSU would feed the voltage into the synth, and then a separate cable would bring it back to the 4th core; there would need to be a cable coming back from the synth anyway for audio/CAN etc anyway, and there was enough pins. But apparently the voltage loss was a tiny wee bit too much, like I think it was already with the first external unit, which sometimes worked, sometimes didn't; I'm not 100% sure this was the reason, but all problems disappeared when I fed the core 5VDC straight from after the PSU's regulator. With the 6581s run by the core and their 12V it didn't matter because there was enough voltage to lose even when bringing it in with the cable from the synth. --- The earlier PSU had the problem of getting hot, I don't know if it was too much or not, but anyway with this the regulator is attached to the 1541s original cooling element, which in turn is attached (with silicon paste in between) to the metal frame, which should have enough surface to cool the regulator :-) I put a fan there for just in case as well :-)