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Bi-stable Multivibrator Experiment No. 4 In

Submitted By: Paelo T. Young BSECE – 2A

Submitted to: Engr. Edbert Aquitania

Date Performed: 15 August 2009 Date Submitted: 22 August 2009

I.

OBJECTIVE:  To be able to perform a multivibrator circuit.  To know how Bi-stable Multivibrator works.

II.

MATERIALS AND EQUIPMENT:       

Breadboard Resistors (1KΩ, 10KΩ) Capacitors (0.1µF) Transistors (2N3904) Power supply LED Connecting wires

III. PROCEDURE: 1. Prepare the materials and equipment needed in the experiment. 2. Construct the circuit of bi- stable multivibrator. 3. Supply triggers 1 and trigger 2 by +Vcc alternately. 4. Record the output.

IV.

WIRING DIAGRAM:

Rc1

Rc2 RB1

RB2

Q1

Q2 C Trigger 1

C Trigger 2

V.

DATA AND RESULTS: Trigger 1 0 0 1 1

VI.

Trigger 2 0 1 0 1

LED 1 1 0 1 0

Output 2 0 1 0 1

DISCUSSION

Bi-Stable Multivibrator is type of Multivibrator that has two stable states and no quasi-stable state. Multivibrators is a relaxation oscillator in which, the inphase feedback is obtained from two transistors or any active device. Typically, their outputs are coupled through resistive-capacitive elements so that one is cutoff when the other is conducting. Bi-Stable Multivibrator is classified as a driven, because it requires external driving or triggering to start its operation and maintain it. It has two stable states that will not change unless the circuit is disturbed. As I observed, led 1 is initially turned on, it only change unless the trigger is supplied by +Vcc.

VII. CONCLUSION

Therefore, Bi-Stable Multivibrator is function not simultaneously, when one is cut-off the other is conducting. The state of this multivibrator will only change when the circuit is disturbed or when the trigger is supplied by +Vcc.