List of Semiconductors

Both figure above showed the list of semiconductors: 

• D1 .......................... 5mm l.e.d 
• D2, D3 .................. 1N4001 50v 1A rect diode (2 off)
• TR1 ....................... 2N3904 npn low power transistor
• TR2 ....................... BC337 npn medium power transistor
• IC1, IC2 ................ ICM7556IPA low power dual timer (2 off)
• IC4 ........................ LM2940HCT 1A low dropout regulator
• IC3 ........................ HCF4520BEY dual binary counter