The IXFN70N60, 70N60 is a N-Channel Power MOSFET 60V, 70A, 14 mΩ These are N-Channel power MOSFETs manufactured using the Mega FET process. This process, which uses feature sizes approaching those of LSI circuits,
This is a thermal printer like you would find on a cash register or adding machine. It will print simple strings passed to it via TTL serial, bitmap images (poorly) and it can generate several different formats of barcodes.
The BC548 is a NPN transistor hence the collector and emitter will be left open (Reverse biased) when the base pin is held at ground and will be closed (Forward biased) when a signal is provided to base pin.
The TIP36C is 100V 25A 125W manufactured in planar technology with base island layout. The resulting transistors show exceptional high gain performance coupled with very low saturation voltage.