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Sedman Smythe

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  1. Hi I am looking for a bit of direction with a project . Some time ago I bought a Spark Eroder or EDM (Electrical Discharge Machine) Mechanically it is very sound, but the power supply is I think beyond economic repair. As I understand the power supply it works between 0 volts and 100 volts Square Wave with a variable output current from 10 to 50 Amps. Also both the off time and the on time are separately adjustable. I believe the original system used a lot of power transistors which were switched by push buttons to obtain the correct power setting. I am sure
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