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Door bell

 


TR1 - Transformer 230V/12V 10VA
D1..D4 - Diode 25V / 1A
D5 - Green LED
C1 - 1000 uF / 25V
C2 - 1000 uF / 16V
C3 - 470 uF / 10V
C4 - 220 uF / 10V
R1, R2 - 10 ohm / 0.5W
R3 - 150 ohm / 0.25W
R4 - 1.5 Kohm / 0.25W
T1 - NPN Darlington 1A
T2 - PNP 0.5A
IC1 - 7812
IC2 - 7805
IC3 - UM66T05L
SPK - Speaker 8 ohm
PB - Push-button 0.5A