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Many thing
in our daily need that can be easily by implement a simple applied technology.
So our life become easy and comfort. We can make anything work automatic, or
work without our intervention so if we forget to run it, or to turn off it, they
will be done by their shelf.
By a simple
applied technology, such as electronics, we can solve many simple problem as
mentioned above. With the small dimension of electronic component and small
power too, we can realize our need, such as automatic lamp, remote controller,
water tank level controller.
Beside all
that mention above, we can make many device that valuable to our need, such as
decorative lamp, amplifier, detector etc. The simple applied electronic circuits
are divided in to two groups, analog and digital circuitry.
Analog
electronic circuits are those in which signals may vary continuously with time
to correspond to the information being represented. Electronic equipment like
voltage amplifiers, power amplifiers, tuning circuits, radios, and televisions
are largely analog (with the exception of their control sections, which may be
digital, especially in modern units).
In digital
electronic circuits, electric signals take on discrete values, which are not
dependent upon time, to represent logical and numeric values. These values
represent the information that is being processed. The transistor is one of the
primary components used in discrete circuits, and combinations of these can be
used to create logic gates. These logic gates may then be used in combination to
create a desired output from an input. In this page you can find one of the
circuit.
Detektor Arah Putaran
Menggunakan D Flip-flop
Dengan menyusun piranti piringan bercelah yang
dihubungkan dengan poros putaran (seperti terlihat dalam Gambar 1), yang
dipasangkan dengan dua buah opto-coupler maka dapat diperoleh detektor arah
putaran benda kerja (misalnya putaran motor).

Gambar 1. Piringan untuk mendeteksi arah putaran
menggunakan opto coupler.
Karena terdapat celah pada piringan, maka sinyal yang
keluar dari rangkaian opto-coupler ada;ah seperti pada Gambar 2. Dengan
posisi opto-coupler yang saling berdampingan, maka sinyal opto-coupler A dan
B akan memiliki beda fasa. Dengan beda fasa seperti itu, maka jika sinyal
tersebut disambungkan ke D flip-flop (seperti pada Gambar 3) maka arah
putaran akan dapat terdeteksi, yaitu seperti terlihat pada tabel di Gambar
3.

Gambar 2. Pulsa keluaran opto-coupler.

Gambar 3. D flip-flop untuk menenentukan arah putaran.

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