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The HEF4938BT,112 is a digital, monostable, single-shoe multivibrator (MSM) based on a logic family of low-power and CMOS logic circuits. This digital MSM is basically a one-shot that can be triggered by either a logic signal or an analog signal. It also provides two different adjustable output pulse widths which can be selected by user, even by a single turn of a contrast-voltage input.

This monostable multivibrator can be used in many different applications. It is useful in frequency-selective circuits, such as FM demodulators, and in applications requiring an adjustable pulse width, such as a remote control. It can also be used in control systems to provide an accurate, adjustable delay setting. It is also useful in motor control, actuator control, and embedded systems.

HEF4938BT,112 is also used in embedded applications. For example, if you are making a wearable device or a robotic arm, the multivibrator can be very helpful for time-based events. It can provide a reliable source of pulse widths that you can then use to control operations.

The HEF4938BT,112 has two operating modes – mono-stable and bi-stable. In mono-stable mode, it can generate a single, pre-set width pulse once it is triggered. It can also be used in bi-stable mode, where it will produce a sequence of two different, pre-set width pulses each time it is triggered.

Working Principle

At the core of the HEF4938BT,112 is a combination of logic gates and transistors. It uses two logic gates, one for the triggering pulse and another for controlling the output pulse. The transistors are used to control the length of the output pulse. When the triggering pulse is applied, the transistors will turn on and the output pulse will be generated.

Then, when the triggering pulse is removed, the transistors will be turned off and the output pulse will stop. This cycle will repeat each time a triggering pulse is applied. Additionally, the slow-down time can be adjusted by varying the voltage applied to the multivibrator.

The HEF4938BT,112 has several notable features. First of all, it has two adjustable output pulse widths. This allows you to set a different output pulse width for each triggering pulse. Additionally, it also has a low voltage cutoff feature, allowing you to prevent undesired output pulses even when the triggering pulse is applied.

Moreover, the HEF4938BT,112 has low power consumption, making it ideal for embedded applications. Finally, it is also quite easy to use, requiring no external circuit for operation.

Conclusion

HEF4938BT,112 is a digital monostable multivibrator which is widely used in different applications like frequency-selective circuits, actuator control, and embedded systems. It has two adjustable output pulse widths and it is powered by a low voltage. Additionally, it is easy to use, making it an ideal choice for embedded applications.

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