most circuits like the one you have found are just for examples..not detailed enough to use as stated...if your parts are smokeing maybe you are turning on both xsisters at the same time....use of these circuits depend on tight tolerence parts and a inverter transformer with very well balanced windings or inverter action will stall out . The transformer must not saturate very easely or it will draw much curent it needs to switch clean and sharp. All of these varations will make a circuit like the first posting not useful inthe real world.
joe