EDM GENERATORS

I WISH TO BUILD OR BUY AN EDM GENERATOR. I UNDERSTAND THAT THERE ARE
TWO TYPES OF GENERATOR:
1. BASED ON A CAPACITOR\INDUCTOR CIRCUIT.
2. BASED ON HIGH POWERED SEMICONDUCTOR TECHNOLOGY.
THE SECOND TYPE IS MY PREFERENCE AS I WISH TO PRODUCE A TRIANGULAR
WAVEFORM WHERE I CAN ACHIEVE THE MAXIMUM PEAK POWER YET WITH THE
MINIMIUM PULSE DURATION AND THE HIGHEST POSSIBLE FREQUENCY. WHILE THIS
TYPE OF GENERATOR IS READILY AVAILABLE ON MODERN COMERCIAL MACHINE
TOOLS COULD ANYONE GIVE ME AN IDEA OF WHERE TO START TO RESEARCH
BUILDING\BUYING MY OWN