110->240 volt conversion

From: Marko Mäkelä (marko.makela_at_hut.fi)
Date: 2002-09-26 20:07:56

Today I received a bunch of Commodore calculators and a SuperPET 9000 
from George Page via Bo Zimmerman.  (Thanks, Bo!)

Most calculators run at a 9-volt battery, which is no problem.  Two of 
them (the Commodore 202 and 207 adding machines) are mechanical, driven 
by a single electric motor.  In the 202, there is a capacitor next to 
the motor; the 207 (a downgraded version of the 202) seems to be 
equipped with a smaller motor and perhaps no capacitor.  What do you 
think, could I run these motors somehow off 220 volts?  It should be 
noted that some functions of the machines need quite much mechanical 
power.  Especially returning the cursor to the beginning of the line 
required so much torque that I almost thought I'd break the mechanism 
when I manually rotated the motor axis.

The Commodore US*1 calculator is very weird.  It has a 7-segment 
numerical display (possibly a fluorescent one) and at least one IC in an 
all-golden package, but it appears to run directly off 110 volts, or at 
least without any transformer.  Maybe this one would run on a cheap 
transformerless 240->110 volt converter (one based on a diode), as it 
probably won't need that much current.

Then there's the SuperPET 9000 with a 320902-02 power supply.  Can it be 
easily converted to 240 volts?  If not, I think I can mount the power 
supply of my 8032 there.  Hmm, does anyone have a SuperPET 9000 in a 
8032-SK case? :-)  Oh, and is the D25F connector inside the SuperPET, on 
the left-hand side of the daughter board, the RS-232 connector?  I saw a 
hole on the left-hand side of the case; maybe you are supposed to run an 
RS-232 cable to the internal connector through that hole?

I'll have more questions in a few weeks, when the B128s arrive per 
surface mail. :-)


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