That's interesting. I took what you said back to funet and looked at the 8050 power supply schematics. It seems that the big nasty brick actually outputs 8.2V AC and 16.2 V AC in that schematic. Wierd numbers, but although I'm not a very good schematic reader, I guess its after the trip through the green monster that it becomes 9V DC and 5V DC, eh? Reason I'm asking is because I'm still trying to figure out what to find to replace the brick inside this 8280 to get 110V. With the smaller drives it was easy because they all use the same PS as the 1541, and '41s are cheap. The 8280, however, has a four-plug output from the brick, which is different from other CBM drives (including the 8050 on funet), and certainly from the PETs. Of course, if I had another machine what a similar PS, I could just measure it. Blech. - Bo > The "brick" you're referring to is actually the AC step-down transformer > that takes AC line level voltages and steps them down to the levels that > the system actually uses (can't remember the secondary voltage). Anyways, > you have two wires on one side that is the supply from the AC wall socket, > the primary winding. On the other side you have your three other wires. > Generally, AC transformers have three terminals on the secondary winding, > two at either end of the winding, and then a center tap somehwere in the > middle. The purpose is to supply two different voltages at the secondary > side. Chances are Commodore just got these transformers in bulk and didn't > need the center/end tap for anything. > > *Geoff!* > > > - > This message was sent through the cbm-hackers mailing list. > To unsubscribe: echo unsubscribe | mail > cbm-hackers-request@dot.tcm.hut.fi. > - This message was sent through the cbm-hackers mailing list. To unsubscribe: echo unsubscribe | mail cbm-hackers-request@dot.tcm.hut.fi.
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