Questions tagged [counter]

A digital circuit that literally "counts" - it progresses through a sequence of states that are representative of some value. It need not count in a natural progression i.e. 1,2,3,4,5 etc. to be considered a counter (i.e. you can have different count sequences) each count value need not be of significance to other circuits (i.e. sometime it's sufficient that the counter counts to some value and then stops). Examples are Gray code, up/down counter.

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I’m having trouble solving this digital circuit. Help!

I need to design sequential logic circuit from this state diagram using only 2 D-latches. And this is my attempt: If I put it in the simulator it just gives me error and wont count. I assumed that ...
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Unable to trigger NPN Transistor from 4017 decade counter output

I am trying to make a unipolar stepper motor driver circuit. As a development landmark, I am trying to first run LEDs using the driver. Attached is my circuit. My 555 timer generates regular pulses ...
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Preparing custom / arbitrary sequence counter

I know following types of counters: Asynchronous counter Clock input of each flip flop is output of earlier flip flop.[ref] Synchronous counter variant 1: with ANDing for flip flop inputs ...
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LED Chaser using counting IC

Total beginner here, I'm trying to build an "LED Chaser" circuit using an IC (CD4022BE) that counts to eight (from zero to seven, and then it wraps around and goes back to zero). Before trying to ...
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96 views

led chaser with non-mechanical shut-off option

I've seen thousands of standard led chaser circuits online but I haven't seen one in which I can shut off all LED's in a non-mechanical way. I'm wiring one pin of my chaser up to a microcontroller so ...
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75 views

circuit that disconnects a connection

I'm designing a circuit that will disconnect a connection when 5 consecutive square wave pulses are missing. If less than 5 consecutive pulses are missing then I want to reset the counting process. <...
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71 views

IC for magnetic environments

I am working on a comparator circuit for converting a small AC signal to a digital (square) signal. The circuit is meant to be used in a strong magnetic environment, so the casing should not have ...
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63 views

Using a clock to increment a counter which drives a mux?

I am trying to program this functionality onto a Xilinx FPGA; however, when I program it to do this, I get no output. My situation is as follows: I have 12 bits of data (in parallel): the first 6 ...
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810 views

Clock Frequency for 4 digit 7 segment display in VHDL

I am using basys 3 and VHDL to create a stopwatch and I need to do it for both the 7 segment display of the basys3 itself and for a external 4 digit 7 segment display. I am given the clock divider ...
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627 views

Simple number counter - PIC16F877A microcontroller problem

I am trying to make a simple counter using pic16f877a. I want to count each time a push button is pressed, that is taking one press as one count, regardless of how long the button is pressed. The ...
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Is this a ring counter ? What is its definition?

We can know the ring counter like :0000 -> 1000 -> 0100 -> 0010 -> 0001,it shifts the "1" bit. Here is my schematic,the same as the schematic from the internet,and because my d-flip flop is active ...
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1k views

Ripple counter, reset problem (J-K flip flop counter)

I am trying to simulate a decade counter using a ripple counter 4 bits and a NAND gate to reset the 4 J-K flip-flops when it reaches 10 (1010). The thing is it does not reset but goes to 4 (0100) due ...
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Glitch on 7490 driving a 7441

Edit 1/1/17: I was going to take a picture of my NI Elvis breadboard as the first fee suggestions didnt work. I removed several ICs (counters) that I was going to use for the other digits and some ...
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117 views

clarification on a particular 555 implementation for 4017 johnson counters

I'm trying to build a 13 count johnson ring counter (which flashes LEDs sequentially 1 thru 13 and then repeats), and I found this circuit which looks perfect: I assembled it with an extra LED on the ...
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Relation between Digital frequency counter and temperature

This is a homework question, I can normally solve the problems on freqeuncy counter but I never did with temperature related frequency counter problems. A digital frequency counter has these ...
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How do I know which logic gate I use to reset asynchronous counter?

I'm a High School senior. Our new teacher doesn't teach well at all and we have a test this Thursday. I don't know which gate to use with the counter(with JK flip-flops) to reset it. Or to set it(To ...
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Functionality of the circuit

I made the timing diagram for this circuit, but i am not sure if it is correct. Please confirm my timing diagram and what is the functionality of this circuit? Is it to generate a pulse 5 clock cycles?...
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74 views

Mod-3 asynchronous up counter using T flip flop in verilog

Design: ...
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Why IC CD4060BD in Multisim there is no pin for VCC and Ground? It's suppose in pin 8 and 16, but there is no such pin in Multisim

I really find it hard for finding the pin in Multisim, maybe it's because I don't know it yet, but there is no pin for ground and VCC for IC CD4060 in Multisim. Do you know which the pin for ground ...
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63 views

Bidirectional Counter implementation using internal counter

There was an assignment as follows: Design a two directional three-bit counter with the following functionality. the counter is changing its value on each positive edge of the clock. the counter's ...
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Synchronous Up/Down counter which shows given sequence simultaneously on 5 x 7-segment displays

I was given a project to design a Synchronous Up/Down counter which displays my sequence (2,1,0,6,5) on 5 x 7-segment displays simultaneously. I started first by designing the Up/Down counter and ...
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Desiging mod counter

I came across following question The 3 bit ripple counter is to be designed as MOD 4 counter. What should be the architecture of the ‘Logic gate’? A. a 3 bit input AND gate B. a 2 input AND ...
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50 views

8-bits synchronous up counter with arbitrary sequence

My question is about logic design, that's a subject that I'm studying now, especifically counters and registers. I designed a 8-bit counter using 2 4-bit counters (with load, count and enable signal) ...
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52 views

Designing a counter

I want to design a counter which doesn't increments value every rising clock pulse(assuming positive edge triggered). Say I have a FSM which has 4 states . Only after traversing of the 4 states , I ...
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51 views

Driving transistors without using MCUs

I'm trying to drive transistors with just a push of a button without using a MCU. The circuit I drawn drives different transistor on every button push and resets back. First part is a debounce circuit ...
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Tracking ADC Control Logic Not Counting down, only up?

I'm working on trying to build a "tracking" type ADC from individual components. Shown below is my schematic using the parts available in Multisim. The design is based on the 74LS191N 4-bit Up/Down ...
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32 views

Timimg of 4060 counter-oscillator

I'm using a CD4060B counter/oscillator and need to know the internal timing of the RESET operation. TI's 4060B datasheet says minimum input reset pulse width is 30nsec at 10V, and the reset ...
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Problem with using Timer Counter interrupt on Atmel ARM

I'm using an ATSAM4E16C microcontroller and i need to get a 1 millisecond tick. I want to implement this using the timer counter module to trigger an interrupt. The clock frequency is 96 MHz, so using ...
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155 views

Implementing a simple counter using VHDL

Hi I'm trying to implement a counter with external control. I'm kinda new to VHDL and I keep getting syntax error for the following code. Can someone help me understand why there's an error here? <...
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563 views

8-bit synchronous up/down counter [Logisim]

I am trying to create an 8-bit programmable up/down counter using D Flip flops. So far, this is what I have: The first 3 flip flops function correctly for both up and down, but the 4th doesn't. I ...
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210 views

Operation of a 74LS191 Counter

I would like to confirm if the implementation of my 74LS191 counter is correct. Here is a diagram of my circuit: The purpose of the circuit is to count from binary 0011 to binary 1111. However, the ...
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17k views

Design a 3-Bit Up Synchronous Counter Using JK Flip Flop (odd vs even numbers)

I have to design 3-Bit Up Synchronous Counter Using JK Flip Flop counters. The first one should count even numbers: 0-2-4-6-0 The second one should count odd ...
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Jk Flip Flop( Counter not Working)

I am having problems with simulation for this particular counter. below are all my diagram including truth table and multisim simulation. the problem is its only going from 0-4 and vice versa. It ...
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56 views

Async counter that counts up to 10

I am trying to make a counter that counts up to 10. I have used 4 flip flops and I added an AND port so that when the counter reaches 10 it goes back to 0. The problem is that after 10 it goes ...
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Is this a new type of ripple counter?

Ripple counters have output bits not change states in synchronism. On the other hand, synchronous counters have their bits connected to the same CLK pulse. However, I ran into circuits, which I ...
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Design asynchrous mod 6 counter using JK flip flop - where those equations come from

I have this exercise "Design mod 6 counter using JK flip flop that uses below table of truth." My professor solved it at one of his lectures but I don't understand fully where those equations come ...
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What is a dc reset?

I read this sentence from a book: "MR is a dc reset". It said about master reset leg in a counter IC. I have been searching but found nothing related to this terminology. I wonder what a dc reset is?...
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209 views

How can I implement this function with JK Flip Flop + NAND Gates

I have a problem about logic design. I need to design MOD 5 Up/Down Counter with control input x, when x=0 it will count down and when x=1 it will count up. I'm allowed to use only JK flip flop and ...
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How to send to pulses to a CMOS Counter

I have tried to find answers to this many times, and the only solution I have been able to find is having two 555 Timers (or a 556) one in astable, and one in monostable. I could easily do this with ...
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291 views

Design Counter With Arbitrary Sequence Using Load

I'm trying to design an asynchronous counter with JK flip- flops, with an arbitrary sequence. The sequence is: 0, 1, 2, 3, 4, 5, 2 ? I know how to solve this kind of problems, but in this case how ...
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Is there any simulation environment provided with TDC-GP1 counter frimwaire?

hello everybody I want to simulate an electronic circuit, I used TDC-GP1 (Time to Digital Converter) I searched in Proteus and in Pspice Cadness but didn't find this part in library, is there any ...
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136 views

RFID (or other) - Proximity Detector

I am trying to detect how often 2 animals 'interact'. Say I have 4 cats, I am trying to work out how often each of the cats interact with each other. I have considered using RFID tags attached to ...
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76 views

4 input counter with display

I have 4 switching sensors for all around detection, they output either 24V or 0V. I want a counter that will add 1 everytime one of the sensors detects something (sometimes 3 of them will detect ...
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74 views

The binary up counter works with function generator in simulation but doesnot work when manual switches are used?

ABOVE SIMULATION IS NOT WORKING ABOVE SIMLATION IS WORKING My simulation donot work if I manually turn switch on and off for clock even though I have used pull down resistors but when I use pulse ...
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26 views

How can I output to one of 4 different outputs without using a demultiplexer?

I do not have a demultiplexer available, so I need a substitute. I have a TTL signal and I need to output the signal to output 1, then output 2, then output 3, then output 4 in sequence, meaning that ...
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Small doubt in asynchronous counter

I was trying to understand the ripple effect in asynchronous counter and I came across this figure:- In all the problems solved in my book, they consider the minimum clock period required for proper ...
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191 views

Pulse counting routine with sleep

I'm making a simple battery-powered project that measures water flow with a liquid flow meter and transmits the value with an nRF24L01+. The microcontroller I've chosen is a TI MSP430FR2110 (family ...
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Sit counter or pressure counter?

We have to count how many times a particular chair/seat has been "sat upon" - how would one go about this? Brute force approach suggests put together a pressure sensor to flip a digital counter. ...
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71 views

Signal decimator/down-sample with lowest propagation delay

I would like to frequency-divide a 10 MHz digital signal by a factor of 8 or 16, with the lowest possible propagation delay. I need a propagation delay that is at most 5-10 ns. The best solution I ...
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533 views

Frequency of cascaded counter

Question: Consider one set of \$Mod-14\$ digital-counter having input clock frequncy \$19kHz\$.If another input clock frequency as first one is cascaded then final output clock frequency of the ...