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IC 74LS373 PDF

74LS, 74LS Datasheet, 74LS Octal D Flip-Flop, buy 74LS, 74LS pdf, ic 74LS These 8-bit registers feature totem-pole 3-STATE outputs designed specifically for driving highly-capacitive or rela- tively low-impedance loads. Operation and working of Latch IC (74LS) Working of Latch IC and operation of Flip flop to perform as buzzer latch IC its.

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Frank Donald November 4, 3 Comments.

Quiz buzzer circuits have been available numerous in number yet we face many problems in most of the circuits and some cost much. Here is a perfect and cost effective electronic circuit which can be used for quiz in schools and colleges. The switches are given to each participating competitors and the respective bulbs can be 74,s373 before them to determine which team pressed the switch first.


74lls373 look into the working of this quiz buzzer circuit. IC 74LS forms the main heart of this circuit and it was a transparent latch which consists of a eight latches with three state outputs. This IC takes eight inputs enabling eight teams to play with it. 74ls733 circuit was powered with 5V power supply and as you can see that the switches were connected directly to the power supply so when the switch is not pressed it gives low signal to the input pins D0-D7.

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SCR Silicon Controlled rectifier was connected to the output pins of the IC and 74lss373 with it diodes are also connected. And diodes was used to allow the forward flow of current from the output pins of the IC and thereby switching the transistor ON and thus perform the Latching operation.

Working of latch IC 74LS – Gadgetronicx

Quiz buzzer circuit can be initialized by switching ON the power supply and once it was ON the quiz buzzer will be ready to use. This low state in the LE pin enables the latch of the IC thereby providing continuous high signal in the output pin. In this point of time the IC will not respond to any of the input signal given by any other switches to it.

And the high output signal further switches the SCR on and thereby the respective bulb of the team will glow and also the transistor T1 connected to the Buzzer will switch the buzzer ON.


Since the output was latched with the input this circuit eliminate the confusion among the participants and also it provides room for eight teams to play at a time.

So this quiz buzzer circuit was cost effective and efficient comparing to other circuits. It will be a great mini project 74l3s73 do at you home and i bet you will like it. Quote and Order boards in minutes on: I tried this circuit in multisim.

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[SOLVED] Help with Latch IC 74LS based latching ciruit

The following two tabs change content below. Frank Donald is an Electronics and Communication Engineer who loves building stuff in his free time.

Video games, blogging and programming are the things he loves most. Latest posts by Frank Donald see all.

Notify of all new follow-up comments Notify of new replies to all my comments. What problem you are facing? I mean which part of circuit is troubling you?