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0
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2answers
32 views

How can I design a 4-to-16 decoder using two 3-to-8 decoders and 16 two-input AND gates?

I have an idea of how to get started, but not sure where to go from there. Since I am using two 3-8 decoders to develop a 4-to-16 decoder, I want to use 4 inputs out of the two 3-8 decoders. So I'll ...
0
votes
1answer
43 views

What's the difference between a decade counter and a “Divide by 10 counter”(MOD 10 Counter)?

I have a project of creating a digital clock out of multiple 7-segments. In order to display digits 0 to 59 in 2 7-segments which is better and easier to use: cascaded decade counters or a "divide by ...
-2
votes
0answers
88 views

Operation of Logical Gate and Big Challenge

i get confusing on Digital Design Course. Anyone Could Describe why the (1) is different from (2) to (4)?
-1
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2answers
53 views

what will be the output of the nand gate in boolean form?the answer given in question is AB+BC+CA

the image shown below is a 3:8 decoder and s1,s2,s3 are the inputs to the decoder circuitry
0
votes
0answers
50 views

Given a Boolean Function, Represent it with a 4-16 inverted decoder

The Question Given a function F(w,x,y,z) = ProductOfMaxTerms[0,4,5,6,7,9,10,11,12] implement F using one inverted 4-to-16 decoder (positive enable) and a NAND gate My Work Since it's an inverted ...
0
votes
2answers
61 views

Understanding decoders and comparators

How can I implement the comparator of two 2-bit numbers using decoders DEC 2/4 and required logic gates? That comparator will be used to compare two 4-bit numbers. The comparator only has one output ...
0
votes
0answers
89 views

Inverted 3 to 8 Decoder

1.write a boolean equation for an inverted 3 to 8 decoder. 2.draw the circuit as a module So far, I have this equation, and hoping this is the answer for the Q1. mo = s2's1's0'EN = 0, others = 1 ...
0
votes
3answers
49 views

Implementing a boolean function using a decoder

I am taking a course in computer organization, and currently struggling with circuits. I was stumped by the question below. I drew the K-map for the boolean function and managed to obtain a ...
0
votes
1answer
28 views

Trouble understanding Verilog decoder logical left shift

This code is from asic-world: ...
0
votes
2answers
67 views

Best way to use multiple decoders for an LED matrix

I'm designing a 16 x 32 RGB LED Matrix and its controller / driver board. So I've designed a couple of solution approaches and I'm wondering if there is a better way to drive multiple 4 to 16 line ...
0
votes
1answer
53 views

How to generate bar using decoder

Ic74154 decoder generate active low o/p i.e for example if input is binary 5 , 4 becomes low. I want a circuit which will give output when i/p is binary 5 then o/p is low for 0 to 4.It is possible by ...
-1
votes
1answer
74 views

Is it possible to create a 4-16 decoder using five 2-4 decoders without enable inputs?

So that the outputs represent a 4-input truth table.
1
vote
2answers
431 views

Constructing decoder 5/32 using smaller ones, without enable

I need to construct a decoder 5/32 using any number of 2/4 and 3/8. How do I start? With Enable it's not hard to figure out, but without them it gets complicated. Advice?
0
votes
0answers
40 views

what is superposition coding?

In the context of multiple access techniques, there is a coding scheme called "Superposition Coding" or particularly "Superposition Coding with Successive Decoding(SCSD)". I surfed the internet, and ...
0
votes
0answers
15 views

Design a 4-to-12 decoder using only 2-to-4 decoders [duplicate]

I'm not particularly comfortable with decoders, and was curious as to what the easiest way to create a 4-to-12 decoder using only 2-to-4 decoders.
0
votes
1answer
68 views

Decoders and Logic Gates [duplicate]

I have two questions. First, I've been staring at this problem for over an hour and I'm stumped. To be clear, I'm not looking for the answer, just some hints to get going would be helpful: 1) Using ...
0
votes
0answers
27 views

Implementing a decoder along with nothing else but a single NOR gate [duplicate]

To start it off I will be plainly honest here, this is homework, but I know that it's not a good idea to ask for help without trying it first obviously. So, I have done the work, but I am still ...
1
vote
2answers
286 views

How do I implement F using one 4-16 Decoder and a NOR gate?

I currently have more than 50% of question done I believe, but what I don't get is that why does the question ask me to use a NOR gate. Doesn't that change the value of F. For example, if I have 0000 ...
2
votes
1answer
3k views

Design a 3-to-8 Decoder Using Only Three 2-to-4 Decoders

Using only three 2-to-4 decoders with enable and no other additional gates, implement a 3-to-8 decoder with enable. The inputs of the resulting 3-to-8 decoder should be labeled X[2..0] for the code ...
0
votes
0answers
348 views

Implementing a boolean function using decoder and or gates

I am trying to implement the negation of a set of minterms. As a result my function looks something like: \$(A+\bar{B}+C)(\bar{A}+\bar{B}+C)(\bar{A}+\bar{B}+\bar{C})\$ I know how to implement it if ...
0
votes
3answers
498 views

How to make 7-segment display count up ?

I've connect 7447 decoder and 74193 counter as shown in the picture but I have not used 555 timer yet. Is there any way to test the circuit before using 555 ? I've connected the pins (up and down) ...
0
votes
3answers
101 views

Switch between two digital signals with no microcontroller

I'd like to use an Arduino to send wirelessy (RF 433MHz, probably) two different digital signals to pilot two different relays (later they will be much more). I know probably this is something very ...
1
vote
2answers
1k views

How to connect 7447 decoder to 7-segment display?

I've connected a 7447 decoder to 7-segment display as shown in figure. When I connect an input, the LEDs doesn't form numbers but they light up randomly. I just want to know the right way to ...
0
votes
2answers
101 views

Signal-driven 3 output logic gate decoder or switch?

I need to build a simple logic gate circuit such that when a single input signal or switch goes low it alternately activates one of three outputs as high. That is, every time it goes low the currently ...
2
votes
3answers
111 views

State Machine w/ Decoder

I'm trying to design a State Machine that acts as a synchronous lock. There is only 1 input (X) and one output (Lock= 0, Unlock = 5v). The machine will only unlock if the following order is put in: 0* ...
0
votes
1answer
66 views

G.711 for dummies

I am in midst of some online telephony course, and there are questions regarding which I have no one to ask but this community. G.711 volume encoding. I have some difficulty to understand how ...
0
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1answer
61 views

Finding the minimum switching expression for this output

Did I do this correctly? ...
1
vote
3answers
633 views

74154 4 to 16 decoder logic diagram

Will someone please explain the purpose of inverting the outputs (0 through 15) as well as the use the NAND gates here? 2nd, less important question: why are there two input G1 and G2 if the ...
0
votes
2answers
170 views

An exercise on decoders

I have the following exercise: Design a circuit that takes a 2 bit binary and makes it x^3 (x cubed), using a decoder of your choice. I thought to do it with a ...
1
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3answers
124 views

Why almost all decoder zero selected output?

I have decoder IC 74138 and I found almost all decoder make selected output low (0) and I want it high (1) and I don't want to connect NOT gate to all of the outputs (it is illogical). What should I ...
0
votes
0answers
64 views

How to create a 4 to 16 rom with basic (AND,OR,NOT,log 1/0) gates

I want to create a read only memory with the basic (and, or not) gates. The 4 to 16 decoder will be used to tell the rom which line / adress should be used. Normaly a ROM is programed by setting ...
0
votes
0answers
337 views

How to design a 6-64 bit decoder using two 3x8 line decoders and AND gate?

gate? please help me in constructing this circuit. I dont know how to use and gate for constructing this circuit.
0
votes
1answer
246 views

Decode an infrared signal with an IR demodulator inside a microphone jack

I was looking at this tutorial about how to decode an infrared signal. One of the posts says For the scoped challenged (like me), a PC microphone jack works great for reverse engineering IR ...
0
votes
1answer
93 views

Is it feasible to decode an 15 kHz RGB (SCART) signal using a sound card?

Do you know whether it would be feasible to decode an 15 kHz RGB signal (from a video game console) using a sound card ? Providing such input can be captured finely enough by a 192 kHz sound card, ...
0
votes
1answer
181 views

Implementing a function with 4 inputs with 2x4 decoders

I'm a bit confused on how it is done. In the pdf we were given it only showed the solution, no explanation whatsoever. My guess is in order to implement 4 inputs with 2 input decoders, the decoder ...
0
votes
1answer
202 views

How to connect 3-digit display and suppress leading zeroes?

I searched a little and it told me to use with more than one display, connect (Ripple Blanking Output) from most significant 7447 to the of the next 7447. Which number would be most significant? ...
5
votes
1answer
91 views

7-Segment Decoder outputs/LED display

What would be the difference in using a 7-segment decoder with active-high outputs vs active-low outputs, to driver an LED display?
3
votes
3answers
252 views

Increase GPIO outputs

I'm working on a project in which I need 32 outputs from an MCU that only has 8 free outputs. To accomplish my goal I have the following requirements: I must be able to toggle more than one output ...
0
votes
0answers
88 views

How to decode the hall-effect sequence from a motor?

I have a motor running in open loop (voltage controlled PWM/ freq.) and am reading the values of the 3 hall-effect sensors via UART. Ideally, I thought the data would show 6 commutation states with 6 ...
2
votes
1answer
1k views

RF Module Not Working

I'm working on RF Module(433MHz ) for Communication between Robot and controller. So I want to test this first. Here is the thing I've used two Encoders Named HT12E and HT12D which are WORKING Fine ...
0
votes
1answer
101 views

Building memory system adresses with decoders

Well I got the following (multiple choice) question. Even with the result given I have 0 idea how they could come to the conclusion.. With 64 memory elements of size 1Mx4 and several 2-input ...
0
votes
1answer
509 views

Implement a Function using 3x8 decoder (74LS138)

I need to implement the function below using 3x8 decoder (74LS138) and a minimum number of gates but I did not see 74LS138 before. F = (A.B)' I implement the function using a normal 3x8 decoder but ...
1
vote
1answer
741 views

Can I use this rf module with HT12E and HT12D?

I have recently made RC car using HT12E and HT12D connected to a cheap ASK RF module of 433 MHz frequency,but it's range is not good only a few meters and also so prone to electrical noise generated ...
1
vote
1answer
98 views

Using a Line Decoder (Multiplexer) to set multiple outputs high

When using a 3-to-8 Line Decoder / Multiplexer such as the 74HC238, can I set multiple outputs (1-8) as high at the same time? As opposed to only one output high at any given time, and the rest are ...
1
vote
2answers
299 views

Pin Arrangement which one should i follow?

I have 2 different arrangement of 7448 IC's pins, and I'm not sure which one I should follow. The two different pin arrangements I found for the IC are: ...
1
vote
1answer
2k views

Finding the no. of decoders required in cascading

I am trying to solve the following question. How many 3 to 8 decoders with an enable input are needed to construct a 6 to 64 line decoder without using any other logic gate. I have a Digital ...
-5
votes
1answer
3k views

Design a 4:1 MUX by three 2:1 MUX or by 2:4 decoder? [closed]

A 4:1 MUX can be built by using three 2:1 MUX. But I've not done it this way: I've used a 2:4 decoder to make a 4:1 MUX. Does it matter?
4
votes
3answers
435 views

How can I store audio files in the uC ROM so as to serially transmit it to a decoder chip?

I am using an NXP micro controller (P89V51RD2) with on board flash of 64kB. I want to interface it with an audio decoder IC, probably VS1011 (if I can get the IC). What should I do to use on board ROM ...
4
votes
1answer
185 views

How large is the address decoder to select an address in RAM? Is the address decoder just a bunch of multiplexers?

I have recently started building simple computing devices using logic gates inside of Minecraft. What I'm trying to build right now is some RAM, and an address decoder for this RAM. I want to build a ...
1
vote
0answers
311 views

Forward Error Correction code, Reed Solomon, Turbo Code, Low-density parity-check

I am new to FEC (Forward Error Correction). Pointers highly appreciated. I am experimenting software with configurable "error protections". Result improving as setting raise to 40%. Still not ...