four − = three
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NE555P is a common time base circuit, the circuit includes transistors 24, two diodes and resistors 17, consisting threshold comparator, trigger comparator, RS flip-flop, the reset input, and output discharge of 6 parts. Using DIP8, SOP8 package.
The 74HC595 contain an 8-bit serial-in, parallel-out shift register that feeds an 8-bit D-type storage register.
The CD4094BE is a CMOS 8-stage Shift-and-Store Bus Register having a storage latch associated with each stage for strobing data from the serial input to parallel buffered 3-state outputs.
The 7400 devices contain four independent, 2-input NAND gates. The devices perform the Boolean function Y = A .B or Y = A + B in positive logic.
