+5V +5V +5V 1K U8 1 U4 22K U6 2 8 1 E 3 IN + 2 IN 4 A IN C2 1 IN OUT 1 3 C1 2 2 IN U3 +5V 100NF - ITR9608 4 U7 IN U1 +5V 100R U5 VCC 3 U2 GND