Keypunch that was on eBay

[John Robertson]

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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