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-