HEF4528BT-Q100J

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Logic multivibrators are basically two-stage amplifiers composed of transistors, resistors, and capacitors. They have a symmetrical output and can operate in various modes such as astable, monostable, and bistable. The HEF4528B-Q100J is a dual monostable multivibrator, which means that it produces a single pulse of a certain duration at each input edge.

Applications

This type of multivibrator is used in many applications, such as timing circuits, PWM (pulse width modulation) controllers, trigger circuits, and oscillator circuits. In timing circuits, it produces a timing output of programmable duration at each input edge. This type of multivibrator is especially useful when one wants to produce an output of specific duration from an input with unknown duration.

Working principle

The HEF4528B-Q100J generally consists of two transistors, four resistors and one capacitor, connected in a specific circuit configuration. When power is applied to the chip, the two transistors (Q1 and Q2) start operating in the linear region. Initially, the voltage across the capacitor (C) is zero. When an input signal is applied to the chip, Q1 starts to conduct and the voltage across the capacitor starts to rise. When the voltage across the capacitor reaches a certain threshold, the transistor Q2 is triggered and the capacitor is discharged. This process is repeated when the input signal changes again and a single pulse is produced at the output.

This monostable multivibrator is capable of producing pulses of any duration at the output. The pulse duration can be changed by changing the resistance of the two resistors, R1 and R2. Increasing the resistance of R1 and R2 will increase the pulse duration.

Conclusion

HEF4528B-Q100J is a versatile dual monostable multivibrator that is used in many applications. It is essentially a two-stage amplifier composed of transistors, resistors and capacitors, and can produce a single pulse of a certain duration at each input edge. The pulse duration can be varied by manipulating the resistance of the two resistors, R1 and R2.

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