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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105 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
161 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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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
212 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
78 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
44 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
370 views

Should we use asynchronous inputs in Moore blocks and synchronous in Mealy blocks?

Consider we have two n-bit counters CNT_A and CNT_B two n-bit unsigned comparators CMP_A, CMP_B and two n-bit binary numbers N1, N2. The counters have two inputs C, L for synchronous count and load ...
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2answers
93 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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1answer
56 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
123 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
109 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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151 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
364 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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1answer
788 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
122 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 ...
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1answer
59 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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4answers
169 views

Making a counter that goes from 1 to 6

How do I make a counter that goes from 1 to 6? I have a 555 Timer connected to a 74LS390N counter which is connected to a 7 segment display module. I can't figure out how to make the counter's output ...
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402 views

Erratic behavior from 16-bit counter IC SN74LV8154 [duplicate]

My test circuit is shown below. I've tried various configurations but keep getting jumps in the output counts. Seems to be repeatable and consistent. For instance, the first jump always occurs ...
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3answers
135 views

How do I activate a counter?

I'm trying to build an electronic lock that takes a 4 digit password and if the password is inserted wrong three times in a row, a logic display is activated. Below is the lock, it works fine, but I ...
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6k views

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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42 views

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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5answers
715 views

Reciprocal Frequency Counter Mean

I have designed a high precision frequency counter circuit. I am using it to measure a frequency of around 35kHz that is stable to 0.1mHz. I can measure the frequency using a Stanford Research Systems ...
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1answer
845 views

74190 up/down decade counter starts from 5 [duplicate]

I've been connected pins input A and C into VCC so the logical number is 1 and input B and input D with 0. The counter starts with 5, but it doesn't clock or change from number 5 into 0 (5,4,3,2,1,0,5,...
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217 views

Decimal Counter with PWM

I'm searching for a decimal counter ic which I can controll with PWM or another signal. The basic counting ic is a 4017 I think, but in the Datasheet you can see that every new clock high pulse the ic ...
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2answers
146 views

Looking for multi-channel event counter IC to verify switch operation

As part of a project, I'd like to test the correct operation of a set of SPST switch ICs (maybe 8 or 16 or so). Each device contains six independent switches, and they are controlled through an SPI ...
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1answer
60 views

Design of A Counter Circuit

I want to build a counter circuit which to count from from 0-7, during some pulseswidth. The problem I am having is that it has to do the whole count sequence during one PW and that is where I am ...
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3answers
137 views

Design of a counter that stays in each state for x clocks

Suppose we have an 8-bit counter out[7:0] It needs to stay in each count for specified number of clocks x, where x can be any integer or fractional factor of 512. My Approach: Use 10 bit counter ...
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2answers
263 views

What is a recycling counting sequence?

Is there any difference between the name "recycling count sequence" and "count sequence"? I have a digital system book saying that a MOD-12 counter has a recycling count sequence of 0001 through 1100....
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3answers
2k views

Propagation delay in asynchronous counter

Are the ripple counters useful in real life? I know, for example, if we set an up counter with 3 FFs, CBA. Followings are the block and the waveform diagram: After the count 001, it will appear 000 (...
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2answers
1k views

How to convert this into a down counter?

I have been learning counters and am able to design an asynchronous UP counter with JK flip flops in Multisim, however I am unable to convert it to an asynchronous DOWN counter. My UP counter counts ...
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2answers
370 views

How propagation delay of synchronous counter is less than asynchronous counter?

My question is very basic one, but thought of asking here to clarify. In asynchronous counter the output of Flip Flop is given as input to other Flip Flop as clock, where as in synchronous counter the ...
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1answer
74 views

FPGA Synchronized Digit Counter goes Asynchronous!

I'm trying to implement one digit counter from 0 to 9 using an FPGA board. The digit is incremented when the signal "pulse" is set. The "pulse" signal is set every fixed number N of clock cycles. The ...
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1answer
1k views

Character '0' used but not declared for type std_logic_vector??? (Algorithm state machine)

After adding the counter to my VHDL code am getting the following error: Error (10316): VHDL error at ASM.vhd(31): character ''0'' used but not declared for type "std_logic_vector" Thank you Code: <...
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3answers
849 views

CPLD is (sometimes) not incrementing counter

I have this simple program running on the Altera EPM240 that’s sometimes not doing the counter increment. ...
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2answers
1k views

Rising-edge or Falling edge Counter

When designing an arbitrary count sequence synchronous counter using kanuagh maps and either JK or D flip flops, does it matter whether the flip flops are rising-edge or falling-edge triggered?
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558 views

Mod 6 counter that counts 1-6 on a 7 segment display (FIXED) [closed]

I fixed the problem, thank you all for your help, I posted the entire circuit, for anyone in the future who has a similar problem. [![enter image description here][2]][2]
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5answers
8k views

Lengthening a 5 ns pulse

I have a 5 ns pulse width High coming out of a comparator that is asynchronous. I am attempting to count this pulse. My current microcontroller (dsPIC33FJ) has an asynchronous counter on board, ...
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1answer
149 views

Tick counter digital signal

I want to trigger a laser externally and I want to trigger it when a rotating small wind turbine blade passes a specific angle. I have a digital signal which tells me when the blade passes that angle. ...
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2answers
1k views

What's the benefit of Upcounting or Downcounting or Center-aligned mode of timer/counter?

I have done several project (3-4 project) via Timers/Counters but I'm curious to know Why do they have three mode for counting? Also I know that in Upcounting mode it count from zero to 0xff... or in ...
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1answer
69 views

truth table for D flip flop with control variables x and y

So I need to build a counter with D Flip-Flop and 2 control variables x and y. XY=00 --> 0-3-2-1-0; XY=01 --> 0-1-2-3-0; XY=10 --> 0-2-3-1-0; XY=11 --> 0-1-3-2-0. How should I make the truth table?...
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2answers
501 views

Prime numbers direct counter [closed]

How can I design a prime numbers counter up to 63?I need to find a rule for the bits? I know how to usually design counters but this one seems kind of difficult since there are so many numbers
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4answers
3k views

Discrete I2C Counter IC

I feel a bit like I'm losing it... I can't seem to find a (modern) i2c counter chip. Something that will take random events, sum them up, and let me poll from a uC a couple times a second. Events can ...
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0answers
72 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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0answers
65 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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1answer
209 views

How to reset the counter automatically after 3rd count by using Cd4026 counter IC and 555 IC? [closed]

How to reset cd4026 counter automatically.
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3answers
2k views

Counting number of push button press by external interrupt

It's a requirement that I should count the number of button press by external or any other interrupt. So when I use the external interrupt to increment the counter by 1, it sometimes is crease by 2 ...
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1answer
308 views

Does the quartz crystal in the standard clock vibrate the same frequency as the sweep motion one? [closed]

In the standard quartz clocks/watches,the quartz crystal vibrates 32768 times per seconds(32768HZ),while this frequency is divided by an electronic counter(15 bit binary digital counter)to derive one ...
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1answer
240 views

Building a 7 Segment clock using mains frequency

As the title says, I want to build a clock using the mains frequency (50Hz). I only want to use digital integrated circuits from the CD4xxx series or something similar. (no microcontroller or do-it-...
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2answers
495 views

Design using only D FF a counter that goes 0->2->1->5->7 [closed]

Have this as an exercise in my logic design textbook. I know how to do this with additional logic, but the challenge comes from only having D flip-flops available. I assume there are at least 3 of ...
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1answer
476 views

How can I see the current state and next state signal? [closed]

I was looking at this code: http://vhdlguru.blogspot.co.uk/2010/04/how-to-implement-state-machines-in-vhdl.html and I wanted to know how you would run the simulation in vivado, but then apart from ...

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