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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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25 views

MOD 16 counter with adjustable MOD [on hold]

Is it possible to design a counter where the user can choose the MOD? The maximum that can be selected is 16.
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0answers
48 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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1answer
53 views

Micro controller clock speed requirement for delay measurement

I am trying to measure the absolute time between two 1Hz clocks (GPS PPS events) to within 50 nanoseconds. I do not necessarily care which clock occurs first, I am only looking for the delta T between ...
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2answers
50 views

percision timing ratio of multiple lights blinking with different durations and intervals

I'm learning a lot of this as I go, my background is mostly in programming. I'm trying to setup a timing circuit for two sets of lights going into a model, and am trying to determine the best way to ...
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0answers
17 views

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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1answer
27 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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1answer
46 views

Verilog counter made of 32 bit adder (syntax error)

For a school assignment I have to make a counter, based on a 32-bit adder, that increments with 1 every clockcycle if 'enable = high' and 'reset = low'. When I try to use the adder in my counter ...
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1answer
46 views

Making a synchronized, rising edge reset signal to a decade counter [closed]

I made a decade counter as in the picture above, but i still would like to build a signal/button that would make the counter reset to 0 after the clocks rising edge when the signal is at 1, and to do ...
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3answers
96 views

How can I design a finite state machine that counts according to this sequence?

when X is equal to 0 and when X is equal to 1 I don't understand how to write the truth table. I understand that when X=1, it means that the machine counts in the following order: 1,3,2,6,4,C,8,9 ...
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1answer
31 views

Altera FlipFlop stuck at GND

I'm trying to make a counter that counts: 0,1,2,3,4,5 I need this for a frequency divider of 6 So I made this table: From this I get: J0= 1 K0= 1 J1 = NOT Q0 AND Q1 K1 = Q1 J2 = Q1 AND Q2 K2 =...
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1answer
34 views

Arbitrary Sequence Counter Up/Down

I've been having problems with one particular exercise at Digital Logic Design. I can't quite put my finger on it and i can't figure out why. I have to design a up/down counter on a given sequence. ...
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20 views

Customized Counter with D-flipflop [duplicate]

How to design a state diagram for a customized counter eg (1 >> 3 >> 5 >> 6 >> 7) and stop at 7, how can i implement the state diagram of this function? what will be the state of the unused state ...
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30 views

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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1answer
59 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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1answer
81 views

Creating a Counter in Verilog for Flashing LED on Lattice Starter Kit

I have a lattic X03LF starter board with 6900C FGPA. There are eight LED available on this board and a push button. The goal of my code is to design a 8 bit counter that increments whenever a button ...
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2answers
112 views

Problem with adding two counters in series on an FPGA

I am using Verilog in Lattice Diamond IDE with a lattice MachXO2 7000HE breakout board. I built a basic counter with a limit input which generates a variable period clock output. It works fine on its ...
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1answer
65 views

A problem with counter [closed]

I have PWM generator built on 74HC04BQ inverter. Pulse frequency is changed periodically by analog switch TS5A3153DCUR over 600 ms, frequency values are 44 kHz and 29 kHz. Binary ripple counter ...
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1answer
68 views

Clock frequency of FPGA circuit and 4-bit counter [closed]

I have implemented a 4 bit counter using HDL. Now I have downloaded the code to an FPGA kit with a 50 Mhz oscillator. This means that the clock period will be equal to 0.02 microseconds and ...
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1answer
456 views

Why ripple counter increments on each 8th pulse

I have connected the ripple counter CD4020 to an Atmega328, which sends a 50ms (low logic level) pulse to the CD4020's input each second and monitors all of its 12 outputs. However instead of ...
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1answer
69 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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1answer
33 views

How to design a module that counts logic 1s in multiple inputs in Verilog?

For example, I have two inputs, whose value can be either St1 or St0. The changes of states are synchronous to the same clock, say 1MHz of frequency. I want to design a Verilog module that counts how ...
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3answers
164 views

Resetting CD4017 Counter when power source is OFF

I found the circuit below online and I have two questions about the reset switch. Does it help to click the reset button when power is OFF? I mean, does it clears the memory of the CD4017 chip when ...
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1answer
226 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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1answer
71 views

How to generate a clock for my ring counter?

I want to run a 4 phase switched reluctance motor at low speed. The expected conduction sequence for the motor winding(y, r, b, g) follows the output similar to that of a 4-bit ring counter and thus I ...
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1answer
121 views

Why can't I implement a frequency divider using a mux in this way?

I found an interesting interview question for FPGA engineer online - Implement a counter with Mux, so I decided to try to do that. I tried to keep it simple and so implement a counter with two bits, ...
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1answer
38 views

74193 stops working after compilation on another PC (QUARTUS)

I got a Quartus project with a mod 22 counter using 74193 from a friend. It works just fine when I run a simulation before a compilation on my PC, but after I compile it on my PC, it stops working ...
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0answers
67 views

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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4answers
70 views

Multiple sensor circuits connecting to one counter and a 555 timer IC [closed]

I have to use a 555 timer in a context where I have multiple sensor circuits connecting to one counter circuit. The idea is that the counter should indicate how many activated sensor circuits are ...
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4answers
82 views

Frequency Ratio Circuit

I'm attempting to design a circuit that will determine the frequency ratio between a known reference frequency \$f_\text{ref}\$, and an unknown signal frequency \$f_\text{sig}\$. The signal frequency ...
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1answer
62 views

Blocking and nonblocking statements for counter

Is there any difference between nonblocking and blocking assignment for the following counters? ...
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2answers
64 views

how do I implement a start timer in a digital circuit

In vhdl, I know how to code a start timer behavorially. However, if I have to implement such a counter to start based on a trigger, how could I implement such a counter? My trigger is another signal ...
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1answer
87 views

Resettable counter using JK flip

I want to design a binary counter in Cadence that counts pulses in every consecutive 50 nano seconds but i want it to be reset at the end of each 50 ns and shortly - so that it doesn't miss any pulse -...
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1answer
91 views

Is there such 555 timer circuit?

I was wondering if there is a simple 555 Timer circuit, or even simple transistors circuit, that has a HIGH output for 1sec, 2sec, or more seconds when I trigger the input switch and will remain HIGH ...
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1answer
99 views

CD4017 Count up to 8

I'm using a CD4017 to control 8 Mosfets. But my problem is that I only get a output from just 1 pin, this pin is random every time i power up the ic. I wired it up like that I shorted reset and ...
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1answer
71 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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1answer
32 views

Digital Counter signal oscillation

I've a digital counter (Kubler Codix 908) with integrated 30Hz interference input filter integrated, but sometimes (when the contact that will increment the counter is closed) it counts two pieces... ...
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1answer
86 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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2answers
75 views

Synchronous burst generator circuit

Ok, this is my very first question here so please forgive me if I'm asking a too broad question or if my problem description is too imprecise. I have a 13.56 MHz (RFID) pierce-type quartz oscillator ...
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0answers
37 views

Can we apply state reduction to a state table having more than 1 input?

Consider the following state diagram: I assigned states as follows: a=00 b=01 c=10 d=11 But when I attempted to reduce the table, I realized that: Some present states do have the same next state ...
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1answer
53 views

Which edges does this counter count? [closed]

This board has two counter inputs. But is there a way to figure out whether the counter counts each rising or falling edges? Rising or falling edges?
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1answer
151 views

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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1answer
9k 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 ...
0
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1answer
96 views

Overvoltage at input causes small jump at IC input pins

I have a PCB with voltage regulator (5V), op-amps, 2 multiplexers, 1 counter, several pots, caps, and resistors. I supply 9V. The voltage regulator converts it to 5V. Without connecting any ...
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2answers
95 views

Why does my counter doesnt do my desired sequence? [closed]

Hey there guys i have to built up a counter with the following sequence : 1-2-5-6-7-8-11-12-15, my Multisim schematics works like a charm, but when i'm about to build it on my breadboard it doesn't ...
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0answers
73 views

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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2answers
117 views

Making a mod-13 counter

What is the most optimum way of making a mod-counter that is not a power of 2? The counter increment is a variable My approach on a mod-13 counter for example: ...
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0answers
56 views

2 seconds delay between numbers in a synchronous digital counter

I've created a BCD synchronous counter like shown below.It's messy but it's just a synchronous counter. I have to put a delay of 2 seconds between the numbers .Can I do it by inserting a D flip flop ...
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1answer
350 views

Async counter that starts counting from 2

I have to make an async counter that counts from 2 to 8. This is what I've done so far: It counts from 0 to 8 and I don't know how to make it start counting from 2.
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1answer
104 views

frequency counter [closed]

I am an amateur in electronics and am going to make an RF frequency counter. So after searching, I selected this circuit but my input signal is RF while the input of the circuit is a pulse. For ...
0
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1answer
49 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 ...