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 (you can have different count sequences). 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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Vivado and simulation for a 4-bit up counter

I am creating a 4-bit up counter using Verilog in Vivado. For this counter, I would like to use flip-flops to represent each bits from Q0 to Q4. For simplification, I used D flip flop to represent Q3, ...
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What type of registers/timers do PIC MCUs use?

Timer1 has the following features: 16-bit timer/counter register pair (TMR1H:TMR1L) What I can't understand is that I couldn't find on the Internet what actual sequential circuit is hiding beneath ...
Awe Kumar Jha's user avatar
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Impulse period measurement using NUCLEO-F401RE board and input capture mode

I have an encoder sensor, which produces high and low levels. I want to capture the period (or frequency) of these levels using NUCLEO-F401RE board and input capture mode for TIM1. I don't want to use ...
Dominykas's user avatar
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How can I implement my binary countdown from the output of JK flipflops to two seven segment displays from 15-0?

I am currently making a 2-way traffic stoplight. The stoplight signals are now fully functional. I have no idea how I can implement the 4 bits (not including my MSB because I just need to display 15-...
Yuan Marquez's user avatar
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Counting relay circuit

I'm looking at making a circuit that activates a 12 V momentary relay a settable number of times with a settable wait time between each activation. At the moment I'm using a Jaycar KA1732 kit, but it'...
Callum's user avatar
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Resetting and advancing counter using same line [closed]

For a project, I need to use one analog signal to control a binary counter -- to both advance and reset, e.g. +1 V square pulse goes to clock and -1 V pulse resets the counter, or 1 V goes to clock ...
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Trying to design a synchronous sequential counter circuit with a given sequence

I'm trying to design a counter circuit that counts 6 → 4 → 2 → 0 → 2 → 5 → 3 → 1 using T flip flops and I haven't been able to achieve it. I tried the steps below and designed the circuit below in ...
Durchfall's user avatar
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6 to 0 count down timer

I'm making a 60 second timer. I already made the 1st digit in my previous question. I want it to start at 6 not 0, basically 6,5,4,3,2,1,0. I made the flipflop state table and followed the similar ...
Noobielectrix's user avatar
2 votes
1 answer
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Making a 9-0 synchronous down counter using flip-flops

I've been trying to make a timer that starts from 0 then counts down at 9 to 0. I've been struggling to make it. I made state tables and diagrams and for the flipflops, but when implementing to a ...
Noobielectrix's user avatar
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How to make my 74LS90N BCD counter to start from 0?

I need this BCD counter to start at 0000. I have the circuit below, but for some reason it starts at 1000 (the QA output starts at 1). I have tried adding a reset ...
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Words on 7-Segment Displays [closed]

I'm working on a project that uses three 7-segment displays. My aim is to show the words 'CAT', 'DOG', and 'FOX' using the 3 displays, one word at at time with a 1 second delay in between. To achieve ...
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Verilog- Why is my state machine output arriving one clock cycle earlier?

I'm writing a Verilog code for a state machine with 4 states. state 0 is buffer time of 1 microsecond. state 1 is trig pulse for 10 microseconds. in state 2, the input is read. If the input is high ...
Milli_Wizard369's user avatar
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2 answers
49 views

Low power low speed pulse divider?

I have a digital input which receives irregular pulses. I want a circuit that takes that input and generates an output pulse for every 100 (or so) input pulse. The expected input speed is 10-300 Hz. I ...
Alexander Ohm's user avatar
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How design a 5 minute down counter using counter integrated circuit?

I'm trying to design a 5-minute countdown timer, but it has some bugs to work with. First of all (just to clarify) the last counter has its presettable start at 4 because the counter starts in 4:59. ...
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Dual edge detector with binary counter doesn't count correctly

I want to build a circuit that counts the on and off of a reed switch in a CD4040 binary counter. I wired the circuit below in a breadboard. This has a debounced switch connected to a 74HC86 that when ...
CBal's user avatar
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How to make a 5-minute down counter using flip-flops? [closed]

Is it possible to make a 5-minute counter that counts from 5:00 to 0:00 and restarts? How many flip-flops (bits) would I need?
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Is this a working way to design a sequencer and an oscillator connected to each other?

I would like to build a sequencer that controls an oscillator. I attached the schematics. The basic principles are that R_1 and R_2 are chosen, so that they yield a voltage of 0.7V at point D ...
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Will this circuit work as a selectable frequency random-looking LED flasher?

I am trying to create a frequency selectable LED flasher that looks random. The purpose is to make a lightning effect for a project I am working on. The voltage can be adjusted if it is insufficient. ...
Unforyetible's user avatar
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2 answers
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Why can’t I find fast transistors and same fast diodes?

I am trying to make a 30 GHz 32 (or 64 bit) counter on flip flops. Ready counters do not satisfy me due to max frequency and price, so I decided to make it on my own from flip-flops. Ready flip-flops ...
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How do I limit a down counter so that it counts from 3 to 0?

I've been studying binary counters and learned how to build an up counter that starts at 0 and counts to a set value before resetting. Now, I need to learn how to build a down counter that starts at a ...
elvishpotato's user avatar
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3 answers
225 views

Why isn't my counter reseting in VHDL?

For a project, I need to write a binary counter in VHDL that starts at zero, counts to nine, and then resets to start at 0 again. I wrote the file below, which seems like it should function correctly. ...
elvishpotato's user avatar
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Which of the modern transistors could be a substitute for 2N709?

I need to replace the damaged Q1 transistor, but I don't have a 2N709. I was thinking about 2N2222 because of the similar case type. However, this transistor differs in frequency. In this follower ...
Jerzy Przezdziecki's user avatar
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Does measuring voltage drops between the EBC terminals guarantee the functionality or non-functionality of a BJT?

Do voltage drops across the terminals of a bipolar transistor, which fall within the catalog data, guarantee that such a transistor is working properly? I am in the process of repairing and restoring ...
Jerzy Przezdziecki's user avatar
1 vote
3 answers
530 views

Flip Flop D Asynchronous Counter Timing Issue

I have a counter made of several FFDs (see image below and please ignore R wire): Def: N(t) - Signal N at time t, where t is a real value and 1 CLK cycle = 2t units. This will be important further. ...
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Spec sheet diagram re: NEC u7225PD LCD Driver (14 segments)

This question is in regards to figure 6 of the uPD7225 Programmable LCD Controller/Driver data sheet. My use case is typical: a 14 segment driver clocked at 147k in divide-by-four mode. From the ...
Quinn Carver's user avatar
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2 answers
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Name and generator for no-repeating-substring bit strings

While solving a different problem I stumbled across an interesting class of bit patterns: a 2n-bit cyclic sequence, all of whose n-bit subsequences are unique. With n=3, for example, the bits ...
jonathanjo's user avatar
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1 answer
69 views

Delay in cycle while making 3-bit up/down counter

simulate this circuit – Schematic created using CircuitLab I am trying to make a 3-bit up/down counter, after failing to use xor IC I resorted to AND and NOR ICs, but the result of the IC starts ...
Samil Tajani's user avatar
1 vote
1 answer
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Trigger (Flip-flop) with under 3 ns delay?

I want to make nanosecond clock timer as a 64-bit counter. There is a scheme (4-bit): I am trying to find JK-trigger, or other, that can work with 300 Mhz clock speed, at least, i.e. 3.3 ns at most, ...
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Hidden pins in Proteus

I'm implementing the following scheme and I have trouble with IC4 element (7430: 8-pin NAND) that have 7 and 14 pins, as I understand, VCC and GROUND respectively. But in Proteus 8 NAND don't have ...
EpicMandM's user avatar
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3 answers
102 views

Counter showed 50Hz when I put it across my body. Why?

I was messing with my new counter when I connected it to fingers and it showed 50Hz (the AC frequency in my country.) Why?
Smaransuthar's user avatar
4 votes
4 answers
382 views

Very low frequency counter

I currently teach an introductory course to electronics that is mostly analog, but can incorporate some digital circuits. On our function generators, we have an arbitrary heartbeat shaped waveform and ...
Simon Marcoux's user avatar
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Shooting Game Design on Proteus not Working

I'm designing a shooting game using 555 timer and 4017 counter. The counter should successively light up 9 LEDs, one of which is a green LED and the rest are red LEDS. When the counter reaches the ...
Reim Oss's user avatar
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Digital Counter not initializing to 0 or rolling over to 0

I'm trying to make a 3-bit counter using D flip flops that loops through the sequence (0,3,4,5,7) repeatedly. So far, I've made a timing trace, block diagram, operation table, Karnaugh maps, rough ...
humanperson's user avatar
2 votes
2 answers
300 views

Turning on an alarm after counter reaches 99

So I'm working on a 2 month design project with the following description I'm trying to exhaust the possible ways to design this without using microcontrollers or ready-made chips. Some of the ...
Zipho Lunika's user avatar
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How can I use a 555 timer and a binary counter to determine the frequency of a square wave pulse?

I'm trying to build a circuit to determine the frequency of a given square wave pulse. The pulse will be generated by a function generator. I have a 555 timer, a binary counter, a seven-segment ...
Dan's user avatar
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How to read the VMZ 08 magnetic inductive flow sensor?

We are in a near-emergency situation where we must read a VMZ08BS1PEG24CV0 flow sensor. You may see more information including the datasheet here. ...
Foad's user avatar
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Can a CD40110 start counting from 1?

I have a small assignment to made a century clock (which includes year, month, day, hour, minute, and second) without using a microcontroller. I decided to use a CD40110 to drive a common-cathode 7-...
Jay's user avatar
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1 answer
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Need to build a counter circuit using D-type flip flops [closed]

I can only learn by examples it seems. I feel I've understood my classes well... but I cannot for the life of me decide where to begin, or link my understanding to anything practical right now. I need ...
NonComposMentis's user avatar
1 vote
1 answer
148 views

What are these pins on a counter chip?

I use EveryCircuit as a simple circuit simulator. For my very novice-level fumblings it has served me well. I have been using this chip, which is called Counter IC. It has 4 output pins A-D, which ...
nuggethead's user avatar
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Why does the up down counter with 7-segment simulation always show X output? [closed]

Why does the counter output remain unknown (x)? I expect the counter to increment. ...
eg huaxin's user avatar
1 vote
1 answer
69 views

Custom frequency divider (/timer) question [closed]

How can I make a frequency divider with multiple outputs with these conditions: no microcontroller can use up to 4 SOIC-16 chips or up to 8 SOIC-8 (or any combo) can use one crystal/oscillator 9v ...
Bikay's user avatar
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4 answers
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0 to 999 Hz frequency counter

I'm trying to build a frequency counter with a resolution of 1 Hz that will count any frequency between 0 and 999 Hz and hold that value. I've built the following in Multisim but I'm having trouble ...
Licentia's user avatar
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Counters max. frequency vs output transition time + propagation delay

I'm using a 74HC93 as a counter. According to the datasheet @ 25°C and 6V: propagation delay CP0 to Q2 = 31 ns transition time = 13 ns max. clock frequency = 35 MHz = 28.56 ns From what I've ...
red's user avatar
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Setting internal oscillator for 4060 counter IC

I'm trying to setup two 4060 counter ICs, to run from internal rc oscillator. The first one will be set to 32Hz, and its pin 3 output (which divides the input clock by 1024), will be fed to pin 11 of ...
Bikay's user avatar
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3 votes
1 answer
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Will the LVDS signal rise time improve after a counter IC?

I want to improve an LVDS signal's rise and fall time. With a Cyclone III FPGA, the LVDS signal has a 500 ps rise and fall time. If I apply these signals to a counter/divider IC like the SY100EP33VKG ...
Ahmet Atcı's user avatar
3 votes
2 answers
312 views

Verilog counter stuck at 48

For part of my VGA signaling module, I've had to make a specific horizontal counter and vertical counter to a keep count the pixels. I've been stuck on these counters because they don't get past 48 ...
Sydon's user avatar
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Modulus 11 Counter

I'm trying to build a modulus 11 counter that will count from 0 to 10 and reset at state 11 in Multisim using a 4516 counter and a D-FF based off the following figure: Because the D-FF inserts a ...
Licentia's user avatar
2 votes
1 answer
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Modulus 5 counter

I'm trying to build a Modulus 5 counter using TTL in Multisim that will count 0-4 and reset on 5. From the K-map I got Q2' + Q0' and using that... Strobe = Q2'+Q0' Strobe''= (Q2'+Q0')'' = (Q2'*Q0')'' ...
Licentia's user avatar
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0 answers
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Frequency counter capable of measuring a range of 0 to 99 Hz

The frequency counter in Figure 2 has a range of 0 to 9 Hz and a resolution of 1 Hz. The schematic for this circuit is shown below: I'm trying to understand how this circuit works and how to increase ...
Licentia's user avatar
1 vote
2 answers
137 views

Frequency measurement with counters

I'm trying to get the following circuit to work. It says to: Connect the circuit as shown in the block diagram in Figure 2 by adding a NAND gate followed by a CD4029 connected as a decade counter. ...
Licentia's user avatar

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