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 ...

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2
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2answers
309 views

Why are synchronous counters synchronous?

Doesn't the input signal having to propagate through the AND gates cause a propagation delay anyway? With the asynchronous counter the delay was caused by the clock signal - with the synchronous ...
0
votes
1answer
56 views

What is reset, preset and clear in a counter circuit?

I know this is a basic question. But I want to know the use of Reset, Preset and Clear in a Counter circuit. How do I use them? An example would be appreciated.
3
votes
4answers
301 views

Record signal when two items touch each other

I have a Carrera GO!!! race track. There's a plastic mechanical lap counter that adjusts every time a car passes it. What I would like to do is to have some sort of electrical connection that when ...
0
votes
1answer
44 views

Common cathode LED resistor with 4017 decade counter

Is it possible to use a common cathode resistor for all 10 LEDs with 4017 decade counter? I try it but only the first LED (output 0) lights up. EDIT: I got it working. My wiring was wrong. I use a 9V ...
1
vote
1answer
53 views

Count number of hours elapsed

It's been a long while since I played with circuits, I'd appreciate a sanity check of the following design; I'm trying to count the number of hours since the reset button was last pressed. Ideally ...
1
vote
1answer
78 views

Sequential circuit with more than 10 LEDs

I need to build a sequential LED circuit that will have more than 10 LEDs in a sequence. The LEDs should blink only one at a time. I know I can do 10 LEDs with a 4017 decade counter easily, but I dont ...
1
vote
3answers
65 views

How to stretch high frequency digital signals (e.g., MIDI) into the audio range

I'm curious about the possibility of sonifying MIDI data, which has a bitrate of 31250. The range of human hearing extends to about 20kHz, which means that the fastest bits of the signal would lie ...
0
votes
2answers
41 views

Low power ripple pulse counter

I'm trying to find a ripple/pulse/edge counter chip that can record rising edges from a wind anemometer while my AVR sleeps. The signal is typically 0-50 Hz. I want to read it every 10 minutes, so it ...
2
votes
2answers
117 views

Is there difference between Timer vs Counter in ATmega328P?

Is there difference between Timer vs Counter in ATmega328P? Or is it the same thing?
0
votes
3answers
162 views

How to make 7-segment display count up ?

I've connect 7447 decoder and 74193 counter as shown in the picture but I have not used 555 timer yet. Is there any way to test the circuit before using 555 ? I've connected the pins (up and down) ...
0
votes
2answers
172 views

How to connect 7447 decoder to 7-segment display?

I've connected a 7447 decoder to 7-segment display as shown in figure. When I connect an input, the LEDs doesn't form numbers but they light up randomly. I just want to know the right way to ...
0
votes
2answers
66 views

Signal-driven 3 output logic gate decoder or switch?

I need to build a simple logic gate circuit such that when a single input signal or switch goes low it alternately activates one of three outputs as high. That is, every time it goes low the currently ...
-2
votes
1answer
73 views

Microcontroller to be used as period counter

I have a sensor module whoose purpose is to detect speed of moving target. I need to analyse the dat coming out from the sensor . The frequency output from sensor is 5 Khz and then I want to use ...
4
votes
2answers
233 views

CD4029 does not initialize at 0

I am attempting to build a very simple 4 bit counting machine using a CD4029 ic and a 555 timer. I have built my circuit on a breadboard and everything seems to be working perfectly, however on the ...
2
votes
5answers
650 views

Very high speed counter (around 1.5 GHz to 2 GHz)

I am thinking of a device that can measure the distance of an object from a sensor using a radio transmitter and receiver pair. I'm thinking of using a counter at the sensor side, with a ...
0
votes
0answers
67 views

Very high speed counter (2GHZ) [duplicate]

I'm trying to build a high speed counter to measure the time delay between two radio waves . I'm thinking of using a MC100EP016A counter which works at a maximum frequency of 1.4 GHz but I cannot find ...
0
votes
0answers
41 views

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 ...
1
vote
1answer
36 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 ...
2
votes
2answers
171 views

Counter is missing an output signal

I used a 4040 counter to count the pulses from an encoder. I then connected two counter output signals to an AND gate, and after that one way is go to reset 4040 counter. The issue is that when I ...
4
votes
4answers
481 views

In a JK Binary Counter from 0 to 9, why is the NAND gate connected to the second and fourth J-K flip flop and not the first and fourth?

In a binary counter design using 4 J-K flip-flops, that counts from 0 to 9, the flip flops are reset when the output from the 2nd flip flop NAND the 4th flipflop equals to 0. Since binary 9 is 1001, ...
1
vote
1answer
62 views

giving output bits of counter to logical gates in system generator

I have a counter block in system generator which has a 3 bit output. The block is shown below: As is apparent from the figure, it's output is represented by a single line not three. I need to give ...
0
votes
3answers
78 views

Synchronous 4-Bit Up/Down Counters preset

I have a synchronous 4-bit up/down counter, and in the data sheet it stands that there are 4 pins where I can enter a 4 bit preset number, but it doesn't say what this number represents. I believe ...
0
votes
1answer
100 views

How to design new flip flop using JK flip flop

I have an excitation table that called MN flip flop like below. Q Q' M N 0 0 0 X 0 1 1 X 1 0 X 0 1 1 X 1 I try to design a counter that count 0-7-2-3 in ...
0
votes
1answer
78 views

How to Modify the Bidirectional Visitor Counter Circuit?

I have recently seen the circuit diagram of an interesting concept in the page - Bidirectional Visitor Counter using Microcontroller. I am planning to do this project circuit on next week with few ...
0
votes
0answers
46 views

Characteristic equations for counters

I'm new to Electrical Engineering and need the characteristic equations for a 2- and a 4-bit-synchronous-counter like this one. I need them for the BCD-Code Aiken-Code, the 3-excess-Code, and the ...
2
votes
1answer
85 views

Use counter's output to reset itself

I have SN74HC4040 12 bit counter, however, I need only 10 bits and then reset it back to 0. Would it be reliable to use 11th bit as an input to the CLR (reset pin)? Basically, when the counter ...
1
vote
1answer
141 views

Counting PIC18F46K20 internal clock edges using MPLAB C18?

I am trying to create a countdown timer using the PIC18F46K20 and display the time on the OLED. I have set up TIMER0 to create a delay of 1 second ( T0CON = 0b00000001 ) so the variabe intCLKsecs ...
0
votes
2answers
65 views

Asynchronous counter for DAC input

Is it OK to use an asynchronous counter for DAC input? If I understand it correctly, the output pins on the counter do not change simultaneously with the clock? Does the latency for every higher bit ...
3
votes
2answers
128 views

What does this dash mark in a DIP 4-bit counter IC indicate?

I have seen a dash mark in 74LS193 4-bit counter IC while working with it in a project. What does this dash mark indicate?
2
votes
1answer
348 views

Johnson Counter VHDL

I have a problem given to me that states: Design a 4-bit Johnson counter and decoding for all eight states using just four flip-flops and eight gates. Your counter needs not be ...
0
votes
0answers
100 views

Ring counter vhdl

UPDATE: CODE IS FIXED AND CORRECT (AT LEAST I THINK) I am trying to design an 8-bit self correcting ring counter whose states are 11111110, 11111101,.......,01111111. This includes reset and enable ...
0
votes
0answers
71 views

VHDL up/down counter explanation?

I've basically got a test soon and I was looking at a past paper and can't make sense of one of the questions. It's asking to make a up/down bit slice counter with async clear using VHDL. Why is ...
3
votes
3answers
354 views

Can anyone tell me any exclusive application of Johnson counter?

I went through many types of counter in my digital electronics text book. Each one was interesting. When I came across Johnson counter, I was not able to figure out any practical application. Can ...
0
votes
3answers
299 views

D flip-flops, but no feedback loops: impossible?

Using JK or T flip-flops, it's easy to create a synchronous N-bit counter by cascading them as depicted here: The above circuit has no feedback loops in it. I have run into a situation where I ...
1
vote
2answers
170 views

FPGA Input Signal measurement

How to measure input pulse signal's frequency using xilinx toolkit on matlab? Since I'm bad at coding,I use System generator on matlab. I'm doing a project, In which I'll be using a Proximity sensor ...
0
votes
1answer
949 views

How to design a binary counter with 4029 binary counter ic

I am trying to build a circuit that counts up to 15 or 1111 in binary using a 4029 ic and 4 LEDs as demonstrated in this video. I have studied the 4029 datasheet, and I still can't figure out how to ...
-1
votes
1answer
227 views

PIC18 microseconds counter

I want to count microseconds between timer's ON/OFF. My FOSC is 48 MHz. I figured out timer1 would need to be initialized like (I'm programming in mplab): ...
3
votes
2answers
113 views

How to make AC signal's level proper for MCU input?

I'm working on a frequency counter coursework, where I use MSP430 MCU. I have to measure signals with specifications: frequency from 0.1 Hz to 1 MHz and signal's amplitude from 0.1V to 10V. The ...
3
votes
2answers
827 views

VHDL--counter for 7 segment display

I am writing a code that when the key(0) is pressed, the letter shown on the 7-segment display changes from the one to the next, like a to b, b to c. It starts from A. When the letter reaches H, it ...
0
votes
2answers
193 views

How accurate is a ripple counter (using D flip-flop) in measuring the frequency of a signal?

I have two oscillating signals S1 and S2 whose periods are always different by a very tiny amount (~10-50ps). Can I use a D-flip-flop ripple-counter to measure S1 and S2 individually, and then ...
0
votes
1answer
96 views

Is this circuit a viable implementation? [duplicate]

Following on from an earlier question where the implementation was flawed, can anyone advise if the below is a viable implementation of a circuit to handle a matrix keypad? The idea is that one ...
2
votes
3answers
325 views

Counter: pulse every 8 clocks

I have a square signal (fixed but can be between 12MHz and up to 48MHz) and I would like to create every 8 clocks a pulse as brief as possible, no more than 1/4 of the period. First, a couple of ...
1
vote
2answers
182 views

Issues with 4-bit counter when porting to PCB

I need help or maybe an explanation on a particular issue I am experiencing when porting a small and relatively simple circuit from a breadboard to a PCB. The circuit is for a school project used to ...
0
votes
2answers
115 views

High speed counter with step control

I am trying to build my own DDS. I want to make a lookup table (eeprom)that controls steps of a counter and then feed it into a DAC to make a wave form ( something like that Direct Digital ...
1
vote
2answers
288 views

How to get 460.8KHz from 1.8432Mhz oscillator using counters?

I need to supply 460.8kHz clock to IC (NCR20C12). However, I can only get 1.8432MHz Oscillator. How can generate clock divided by 4 from it? I have a couple of SN74LS393 counters and want to ask, is ...
0
votes
1answer
907 views

How to reset a 4026 counter IC when it reaches 6 for electronic dice

I'm trying to build a circuit to simulate a dice roll using a 555 in astable as it's heart. The output pulses are counted by a 4026 and then fed into a 4511 BCD to 7 segment decoder. It works ...
0
votes
1answer
241 views

Where to put the unused states in synchronous counter that counts Even numbers?

Suppose if we have a counter that counts only Even numbers and the unused states(odd numbers) treated as don't-care condition. ...
-1
votes
3answers
372 views

Decimal counter in VHDL?

I would like to implement a decimal counter that will count from 0 to 9999 on the LED display on a Digilent BASYS2 board. Can somebody help me how to solve this problem?
1
vote
2answers
639 views

How does the 4017B Decade Counter work?

I am currently looking at a 4017B Decade Counter Data Sheet. As I look at the Logic Schematic for this IC (http://www.ti.com/lit/ds/symlink/cd4017b.pdf) I can see several sqaure boxes label D, C, ...
0
votes
2answers
71 views

Should I use Counter1 to record time series data?

My Atmega328 will record data from an external sensor at around 100Hz over several minutes. Communication is done through I2C requests to the sensor. I need to store the time of measurement (relative ...