# Tagged Questions

2answers
53 views

### How to cycle through bits of information for a hex display?

I am doing some work with a Hex Seven Segment Digital Display with a built in decoder that takes in 4 bits of information. Controlling it I have 4 cascading T-FlipFlops whose outputs are inverted so I ...
1answer
90 views

### Digital Circuit with Toggle Switch using Logisim

I'm supposed to design a small digital circuit (with Logisim) using basic logic gates, so that when this circuit is used with the chosen switch (which has to be a button), it will make the circuit ...
2answers
116 views

### Can I simplify this to a 2-to-1 multiplexer?

I have the following 4-to-1 multiplexer circuit: simulate this circuit – Schematic created using CircuitLab With this truth table: ...
1answer
211 views

### Realizing logic gates with transistors: AND and OR gate in parallel, trying to understand different behaviours

I am trying to understand and finally realize a logic gate by using transitors. In order to build a "simple" one-bit adder, my first step was to design a circuit that puts an AND-gate and an OR-gate ...
2answers
255 views

### Overflow detection in a CSA (Carry-save Adder)

How do you detect overflow when you have a CSA? I have 3 16-bit two's complement inputs and a 16-bit output and I'm wondering how do I detect overflow?
2answers
91 views

### Constructing an Encoder

I understand an Encoder is 2^n input lines and n output lines`. I want to construct an Encoder from scratch so I can understand how it works, so that I can construct any other Encoder in the future. ...
1answer
141 views

### Binary to Gray Code

I have built this 3-bit Binary to Gray Code circuit. I would like to know if it is correct. I have used 2 Xor gates.
1answer
309 views

### Turn S R Latch Using a NOR gates into NAND

I can't post a picture so the question will use Boolean Algebra. For me an SR Latch is S NOR Q' = Q R NOR Q = Q' I will represent Q' as P since Q' might be ...
3answers
202 views

### Help with designing a circuit with logic gates

I want to build a circuit with the following design: 3 inputs 1 NOT gate 2 AND gates 1 OR gate This is my truth table: ...
4answers
443 views

### Why we need clock pulse in sequential circuits?

I need to know why do we need clock pulse in sequential circuits but not in combinational circuits?
2answers
658 views

### Given a gated SR latch, How do I make it a set dominant gated SR latch?

Another weirdly worded question in my digital logic book. It doesn't specifically define set-dominant or reset-dominant - nor does it show how to use these in practice with drawing circuit diagrams. ...
2answers
714 views

### Help verify 8x8x8 LED cube circuit

I am a beginning hobbyist when it comes to electronics. I have read lots of theory but I only have a little bit of hands on experience. I would like to build an 8x8x8 LED cube and I came up with this ...
1answer
86 views

### How to detect and identify multiple points of contact

I am looking for a way to detect & distinguish multiple points of contact from force or pressure. I have asked a related question at the URL listed below: How to encode a large number of digital ...
3answers
122 views

### How to encode a large number of digital input signals into a signal result

I would like to know how I can detect simultaneous pulses on several wires. Essentially I will have several wires that will serve as connection points when pressed upon. A simple visualtization of ...
0answers
114 views

### Simulation of a circuit

I am trying to simulate this circuit i want to know if the circuit i assembled is correct? i want the current of VCCS element 1 and 2 plotted on a graph as i vary Vtun, Vsprog and Vdprog. I am ...
2answers
132 views

### Gate Logic Initial States?

This is probably a silly question but I figured this might be worth another question instead of adding it onto my other one. Referring to this question (About an SR latches first Q state) What is the ...
2answers
307 views

### What is the minimum amount of 1bit Full Adders required to implement the equation 4X + 3Y + 13?

Using 1bit FAs and 0/1 constants only, while X(x1,x2,x3) and ...
1answer
80 views

### Digital Electronics [closed]

which steps should i take in finding the mod number that would decrease a signal of 2MHz to 0.4MHz.
1answer
717 views

### How to fix my designed calculator circuit using Logisim

I am trying to design a calculator circuit that adds 2 four-bit 2's-complement binary numbers as its input and outputs an 8-bit 2's-complement number when the control bits equal 01. Here's what I ...
2answers
2k views

### Implementing 4-to-16 decoder using 3-to-8 and 2-to-4

This is digital logic question. I think it's alright to post it here. I'm trying to implement a 4 to 16 decoder using 2 to 4 decoder and 3 to 8 decoder. What I did, I used 2x of 2-to-4 decoder and ...
2answers
133 views

### Is there any such logic gate that accepts inputs from both sides and also stores information within the gate itself?

I'm trying to design a logic circuit that will end up looking a binary tree (there will be a "root" logic gate at the top and a whole bunch of "leaf" logic gates at the bottom). Input is fed as ...
1answer
296 views

### How would I design a simple logic circuit for 3 input bits?

All - Suppose I have 3 input bits Bit #0 Bit #1 Bit #2 I need to design a logic circuit has follows: Input: Bit #0 = 1, Bit #1 = 1, Bit #2 = 0 Output: 0 Input: Bit #0 = 1, Bit #1 = 0, Bit ...
1answer
136 views

### Minimization of Logical Equations

I have been giving a problem were I have to design 1-bit subtractor, which performs single bit binary subtraction. It has three inputs: the digits ai, bi (bi is subtracted from ai) and the borrow from ...
1answer
267 views

### Should I use pull up resistors in this configuration?

I am interfacing a 3.3V FPGA to a 5V DSP. I am using this bidirectional voltage transceiver: http://www.nxp.com/documents/data_sheet/GTL2000.pdf In the diagram in page 4 they're using pull up ...
2answers
404 views

### Understanding basic computer hardware diagram of address decoding circuit

Hi I'm a computer science student doing a computer hardware course and am having trouble understanding this circuit which is supposed to show how control signals at the memory can be generated using ...
2answers
562 views

### 8 bit octal full adder help

I have this project listen below and im not sure where to start maybe someone can give me a few pointers or perhaps point me in the right direction of starting this? Thanks!! Input: A, B = octal ...
2answers
2k views

### What is the difference between a nonretriggerable and retriggerable One Shot?

One shot is a monostable multivibrator, it is normally in a stable state but once triggered it changes to an unstable state. But I can't understand the difference between a nonretriggerable and a ...
2answers
349 views

### How to connect external switches to this circuit board

I am circuit bending a walkie-talkie to move some of the switches around and embed it in a shoe. One part I'm not sure about is how to replace some momentary switches on the front with external ...
4answers
277 views

### Is it possible to implement SOP with 4 terms by only 3 NAND gates?

if I have a truth table for ABC and output Z ABC Z 000 1 001 1 111 1 110 1 SOP=A'B'C'+A'B'C+ABC+ABC' the most straight forward way will be 3 ...
0answers
105 views

### Schematic editor for digital designs [duplicate]

Possible Duplicate: Good Tools for Drawing Schematics I'm looking for a schematic editor/capture tool to use in the very initial steps of a digital design. This is, as a block diagram ...
2answers
862 views

### How to control a Water Valve through a circuit using latches or flipflops?

I need a circuit that can "simulate" opening/closing a valve for a water tank. The circuit has only 2 inputs, 'm' (minimum) and 'M' (Maximum), and an output 'V' (valve). The valve is only open if V= ...
1answer
838 views

### Boolean majority function

In this picture is an example of a boolean majority function (may be a bad example) So the rule says that the result or an output of a majority logic function would be a selection of majority ...
2answers
166 views

### How can I get a broad overview of the world of electronics?

(Feel free to edit the question's title. Wasn't sure of a good one liner for my question) I'm a university student who has found a love for electronics and circuit design. I have a solid knowledge of ...