12 Apr
2009
12 Apr
'09
4:39 p.m.
Roger Holmes wrote:
Thanks for whoever it was who posted the info on the
IBM 029 keypunch
on eBay. I have won it, nobody else bid. After it has been shipped
across the Atlantic I will have to think about converting it from 60Hz
to 50Hz. I have the remains of a 50Hz verifier which has a 240v / 50Hz
motor I should be able to use. Hopefully the rest runs on DC, so a
step down transformer before the transformers and bridge rectifiers
might be enough. Shipping costs more than the item of course.
Anyone have any thoughts if it is worth trying the whole thing with
just a 240 - 110 transformer? If the motor burns out, not the end of
the world.
I have had good success using a DC - AC inverter for powering 300 watt
loads for automobiles...
I have found that for motors and transformers these seem to work fine
with the transformer/motor not overheating due to the imperfect
sinusoidal waveform (modified square wave). I have adjusted the
frequency of the inverter that I picked up from Canadian Tire (Large
chain auto supply example) as it used a pretty basic IC oscillator
circuit and after downloading the schematic and suggested uses found the
resistor that I could adjust frequency. I see no reason this would not
work for larger inverters (500 Watt).
Or buy a North American inverter (115V 60Hz) that is the correct wattage...
Then all you need is a hefty 12VDC supply and I used a computer
switching supply - they pump out lots of amps on the 12V line these days.
We installed a couple of these in jukeboxes going to the orient and they
provided all the power for the machine - set the computer supply to 220
and they are still going strong...
John :-#)#
--
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Call (604)872-5757 or Fax 872-2010 (Pinballs, Jukes, VideoGames)
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