## Minggu, 23 Oktober 2011

## Selasa, 18 Oktober 2011

### Astable Multivibrator

Astable multivibrator is a circuit to produce a square-wave or pulse at the output. Application of astable multivibrator is flip - flop, etc.

RA, RB, and C used to control output.

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RA, RB, and C used to control output.

## Senin, 17 Oktober 2011

### DEMORGAN’S THEOREMS

Two of the most
important theorems of Boolean algebra were contributed by a great mathematician
named DeMorgan.

**DeMorgan’s Theorems**are extremely useful in simplifying expressions in which a product or sum of variables is inverted. The two theorems are:## Kamis, 13 Oktober 2011

### BOOLEAN THEOREMS

We have seen how Boolean algebra
can be used to help analyze a logic circuit and express its operation
mathematically. We will continue our study of Boolean algebra by investigating
the various Boolean theorems that can
help us to simplify logic expressions and logic circuits. The first group of
theorems is given in Figure 1. In each theorem, x is a logic variable that can
be either a 0 or a 1.

*Figure 1.single-variable theorems*

(