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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Problem with 74LS latching! Lets look into the working of this quiz buzzer circuit. PV charger battery circuit 4.

Quiz Buzzer Circuit using IC 74LS – Gadgetronicx

They were a great introduction to simple logic and hardware which is a bit lost in todays massive chips. If you like I will draw the schematic for you. Latest posts by Frank Donald see all. CMOS Technology file 1.

Measuring air gap of a magnetic core for home-wound inductors and flyback transformer 7. Here is the Link for the datasheet kindly take a look at the electrical characterstics, hope this helps. But when the OE is 74s373 the output will be in a high impedance state. This IC operates with maximum of 5 V and widely used in many kinds of electronic appliances. Our main server could be out of service anytime. Quote and Order boards in minutes on: Do I need pull up resistors or does this sound like bad chips.


Digital multimeter appears to have measured voltages lower than expected.

IC 74LS forms the main heart of this circuit and it 74ls733 a transparent latch which consists of a eight latches with three state outputs. Here is a perfect and cost effective electronic circuit which can be used for quiz in schools and colleges. OE is held tied to ground. It could have been a useful touch switch which weren’t very common then74lz373 I learnt how to filter out, clamp and provide immunity instead!

Here is an example http: Frank Donald 74ls733 an Electronics and Communication Engineer who loves building stuff in his free time. Therefore almost every post I write would usually be updated several times till it reaches its saturation: The current I1, R7 and Q2 replace the push-button switch in order to simulate the circuit.


Since the output was latched with the input this circuit eliminate the confusion 74la373 the participants and also it provides room for eight teams to play at a time.

Distorted Sine output from Transformer 8. Frank Donald October 27, 2 Comments. Thanks also for reminder on LED driver, I had dropped down to logic 74ls33 Input port and input output port declaration in top module 2.

Frank Donald November 4, 3 Comments. How do you get an MCU design to market quickly?

Last edited by sharikbaig; 27th August at Help with Latch 744ls373 74LS based latching ciruit I actually made a similar project back in the 80’s when experimemting with programmable logic the good old days!


The only potential issue is both switches operating together as the output becomes indeterminate. Quote and Order boards in minutes on: SCR Silicon Controlled rectifier was connected to the output pins of the IC and along with it diodes are also connected. How reliable is it?

Can anyone please help me sort out the problem?. Also I may not reply at time.

Datasheet of 74LS is also attached. 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. Each momentary switch would latch a solenoid valve and when activated switch off the others valvesa bit like a manual washing machine. Enable gates pin 11 high 2.

I tried this circuit in multisim.

When the OE pin is low input data will appear in the output. What problem you are facing? I mean which part of circuit is troubling you? Place data on input pin 3 – i. Choosing IC with EN signal 774ls373. Synthesized tuning, Part 2: Similar for other switch input.

Originally Posted by kripacharya. Hierarchical block is unconnected 3.