I’m going to build DIY Chris Gupta Magnetic Pulser

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I'm going to build DIY Gupta Magnetic Pulser

http://www.newmediaexplorer.org/chris/2003/08/19/build_a_low_cost_simple_magneti\

c_pulser.htm

Couple of quesions:

1. It's written that: „Any SCR with PEAK current of at least 600 to 1000 amps

should work. The one shown is 20 amp continuous with the appropriate peak

rating... " . I checked the S6020L specs and the peak current is 250A. Why is

that? Is 250A enough?

2. I'm not sure about the Fig. 3 „Autopulse Circuit " : there is a switch and two

1Mohm potentiometers with „50% " and „70% " markings. Should this work as a switch

between different pulse (Hz) settings? Do " 50% " and " 70% " represent roughly 500

and 300kohms settings?

3. Is it a good idea to use separating transformer (1/1 ratio) on input for

increased safety? This trafo should have it's nominal power equal or greater

than the total power of light bulbs, right?