NAND Gate

Part List
Transistor = BC558 or any general purpose PNP Transistor will work.
Transistor = 2Pcs BC548 or any general purpose NPN Transistor will work.
LED (Light Emitting Diode) any Color except white.
3 Pcs Resistance of value 1 K.
3 Pcs Slide Switch and one battery container for connecting 2 cell.
This circuit works well and consumes only 3 Volt.
Circuit Diagram will be available soon