Bootstrap voltage generator for N-channel MOSFET only based H-bridge with 12V load voltage. Bootstrap voltage appear on voltmeter "+" pole.
FYI: 555 timer based generator can help bypass the 3ms and 50ms simulation speed limits in circuits that otherwise use EveryCircuit generator components for signal generation that have hardcoded simulation speed limit. This principle is true also for PWM signal generation in circuit simulation. For real life applications you might like to different bootstrap charge pump solution.
