Content for CD4047

CD4047

CD4047 is a low power IC capable of operating in either in astable or monostable mode. Here it is wired in astable mode. It works by charging a capacitor (C2) through a resistor (RV1) as in every astable multivibrators. Variable resistor (RV1) is provided for adjusting the output frequency to exact 50Hz. The time period of the oscillation is given by the relation T = 4.40*R*C. For detailed working of the IC, please refer its datasheet. CD4047 has two outputs (pins 10 and 11) which are complementary to each other. These square wave pulses are pre amplified by TIP122 transistors. This amplified current is used to switch 2N3055 transistors to drive the inverter transformer. Two 2N3055 transistors are connected in parallel to increase the current driving capabilities. The Zener Diode ZD1 and capacitor C2 is used to provide constant 9V for the IC.

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