Don Smith Device Project Part 19: New Driver with L1 Tank Circuit
Testing out my new Variable Power and Variable Freq driver i built for the Smith project. I basically built a variable version of Don’s NST 🙂 Using a 555timer with added Lm393 to give a very sharp quality square wave which then triggers the transistors to then drive the ignition coils arranged in anti-parallel, so that that when one is positive, the other is negative, and the spark discharge is between their two HV outputs. The driver minus the power battery all fits in a briefcase, the signal gen is on its own battery so as to not be as vulnerable to damage from back-emf on the transistors. Protection added to the circuit consisting of a neon in series with a 10k 1 watt resistor between the positive and the top of the collectors before connecting to the ignition coils did the trick. So now to figure out the most responsive coil arrangement and tune the secondary to the primary, then we should be on our way to power land.
