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Frequency Converter Background


The Mains Voltage and Frequency in The USA and some other countries differs from that of Europe. 110Volts/60Hz in the USA and  220Volts/50Hz  for Europe.  Because of this a Step down Transformer must be used to alter the input voltage to the correct level. This alone is not sufficient as the Jukebox motor uses the input mains frequency to determine it’s speed. This means a Jukebox originally designed for 60Hz  mains will run very noticeably slow when operated on 50Hz mains.


The solution to this problem is either to change the worm and wheel gearset to provide the correct speed (as the manufacturers did with Jukeboxes destined for Europe) or electronically change the mains frequency. The excessive size and cost of an industrial frequency converter to do the job coupled with difficulty in locating a good 50Hz gearset for the Seeburg V200 I was restoring led me to design my own converter.


It took a year of prototyping to come up with a transformer-less, lightweight, plug in design that could withstand the full speed reversal that the Seeburg motors have to endure. The final prototype has been in regular use for last 4 years. Word got round about the converter and I soon realised there were several enthusiasts with the same problem. So I made a few more. It then became apparent that Collectors with 78rpm machines also had this problem. After further prototyping I eventually modified the design to be enable it to withstand the power requirement of the much larger motors found on the 78rpm Jukeboxes of any manufacture.


NOTE: -  I am not a business!  I make these converters in very small numbers by hand, as they are ordered. The profit on these converters is almost nothing. I consider myself an enthusiast helping other enthusiasts.