Experiment no. 2
Discussion:
In this experiment our objective is to study the characteristics of diac and triac to demonstrate the
operation of diac-triac phase control circuit. Using the lamp dimmer circuit as an application of
diac-triac, we operate and test the lamp dimmer circuit and study its waveform through
oscilloscope.
On the first part of the experiment, we study the operation of a basic diac-triac phase control.
Figure 1 shows the construction of the basic diac-triac circuit with the 35V AC source. The
intensity of the light is controlled by varying the 100kohm potentiometer in series with the
capacitor. We can be seen in said figure that the 22kohm is in series first with the bulb to avoid
zero resistance. Because zero resistance can lead to infinite current. The greatest intensity of the
light can be seen if we set the potentiometer to its minimum value resistance. Next we slowly
increase the resistance of the potentiometer until the light turns off. Now, we study and measure
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- Summer '13
- marius jacinto
- Incandescent light bulb, Fluorescent lamp, TRIAC, Dimmer, diac-triac phase control
