Keypunch that was on eBay
jrr at flippers.com
Sun Apr 12 11:39:44 CDT 2009
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's Jukes Ltd. 2343 Main St., Vancouver, BC, Canada V5T 3C9
Call (604)872-5757 or Fax 872-2010 (Pinballs, Jukes, VideoGames)
"Old pinballers never die, they just flip out"
More information about the cctech