PDP-11/34A / BA11-K PSU

From: Tony Duell <ard_at_p850ug1.demon.co.uk>
Date: Sat May 24 16:47:00 2003

> On 2003.05.22 22:18 Tony Duell wrote:
>
> > > - power inlet unit with mains cable, circuit breaker ... and a PCB
> > > that looks like a small PSU.
> > If that's a PCB that covers the top side of that module,
> Yes.

Do you have a cable with a white (nylon?) edge connector to fit onto the
front edge of this PCB? If not, you need to make one.

> > Maybe the odd cable or connector is missing, but you have the main
> > parts.
> Souns good. When I get the H745 and H7441 PSU bricks working I will try
> to build a minimal setup to see if the CPU and RAM is alive. Then add
> the peripheral controllers ... Unfortunately SMPSUs are not my friends.=20

Actually, these bricks are relatively friendly in that there are no
lethal voltages in them (they runn form a 20-30V AC input, which comes
from the big transformer and is isolated from the mains). The maximum
current that will flow in the event of a short circuit is not that high
either (10's of amps), although it is enough to make small signal
transistors explode (that's from experience!).

>
> And if the machine works there is the next task: Rebuild the rusty RK07.

I bought an RK07 that was full of water (seriously, it poured out of the
hollow baseplate...). After drying it out, cleaning the heads,
connectors, etc, it worked fine...

-tony
Received on Sat May 24 2003 - 16:47:00 BST