Schematic Diagrams Circuits

where can i get circuit/Schematic Diagrams of any electrical/electronics equipment.?

I have been trying my best to put some few things together as per building electronics and electrical equipment but i really lack circuit diagrams that can put me through. i presntly need a Circuit Diagram of an inverter with atleast 20kVA output.

There’s a 1KVA inverter at http://www.aaroncake.net/circuits/inverter.asp?showcomments=all
To crank up the output you need to uprate the transformer and add parallel transistors.

Circuit Diagram Temperature Sensor Thermistor Comparator .wmv