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I was working on my project with logic, sequential and combinational ICs. And, wanted to test the 74LS10 3-input NAND gate and it wasn't working!! All other ICs are working, NOR, 2-input NAND, counter, 555 timer. I've other 74LS10, if they all not working then I'd combine 2-input NAND and one AND gates to get 3-input NAND gate. I just w
hi everyone, I was required to build a stop watch that would count up to 60 and then go back to 0 and start counting again. Also i had to make 2 switches one for the start/stop button another for the reset button. I have completed both the mod 60 and the start and stop button and it is working in multisim. I cant seem to get the reset button to wor
I open your image by dragging it to a graphics editor. Have you tried operating each component by itself, to make sure it works the way you expect? (For instance, can you get any number to appear on one of the displays?) The columns of IC's must get the correct sequence of gate signals, in the correct polarity. The counter, the latch, the decoder
Hey Guys, I am not able to grasp the waveforms of divide by 3 counter where two flip-flops produce waveforms at half frequency but at quadrature phase relation. Could anyone please explain me waveforms? Thanks in advance !
For your 2nd question the output is always 8 bits(from one of the 2 counters). This means that the lower 8 bits of the 16 bit counter are not used. For driving 8 bits of the output, you will need 8 2:1 muxes. Each mux will take one input from the 8 bit counter and the other from the 16 bit counter. I assume that the select (...)
The schematic in post #4 gives a first clue what you actually want to achieve. We see a mux circuit, apparently intended to scan the four digits one-by-one. Presently this part doesn't work. The 74163 clear input is an asynchronous one, thus the counter is immediately reset when counting from 2 to 3. The fourth segment won't be lighted. Plea
We'll have to wait for the schematic but the general principle is you run a counter at say 1,000 counts per second so it increments in 1 millisecond intervals. You reset it to zero then have a start signal to initiate the reaction test, the user then does something to stop the counter. What it dispalys is the number of milliseconds betwen (...)
ok friends now my seven segment up / down counter is perfectly work using up / down switch . now i want to add external EEPROM . and my logic is that when power cut of my micro that time when we power device that time eeprom store last value of seven segment . how is that possible please help me ? just Example My micro Power supply is 5V . i h
Please kindly find the schematics as enclosed. Well, the intention is the usage of the 7476 flipflops as disordered rign counter as described in the first post. I don't know what your point is about "bad asynchronous circuit". I'd be thankful if you kindly explain.
hi friends, I want to design a RPM counter for 3 wire CPU fan. For that, I design circuit using PIC16F84 as counter. The counter is working perfectly. But when I try to connect the 3rd wire to PIC, I am getting constant 3000 RPM in display. There is no change even the fan is stopped by hand. Here is the code for PIC16F84A using MikroC. (...)
You could use a divide by three counter, driven by your 555 oscillator. You could use three 555s monostables each one firing the next . Frank
Hi guys noob here, first post. I need to design a program counter to satisfy the following schematic. 101185 and here is my code so far. Now I'm pretty sure this is wrong. But I don't even know how to test this yet using QuartusII, hoping my TA will explain it this Monday. Would someone with more experience take a loo
Without seeing the schematic how are we supposed to tell? Each of those is a binary counter but they have different divider outputs, whether they will work or not depends on how they connect to the rest of the circuit. The CD4020 is easily available almost everywhere, just because your local shop (wherever that is) does not have them, it doesn't
Guys, How to measure heartbeat with atmega128 ? I have created the sensor module with TCRT5000 and op amp and the pulse already, My question is how can I count / measure the pulse and display it to my LCD on BPM ? Thanks
Post a schematic!!!!! Tell us what you are using for a receiver My project is bidirectional visitor counter.I m havin problem somewhat like above..using 2pairs of IR LED & IR detector(photodiode),,o/p from detector are fed to inverting i/p of comparator LM324 & other i/p of LM324 is 10K ohm preset..then o/p from
PIC 16F877A Hi, I have a problem where i don't how to write a program for my rotation counter. My system is a rotation counter, It count decrementally. does anyone here can help me on the programming part? Thank you.
Hello, Just a DC pulse across the wire, from the counter output.
Hello everyone. I would like to excuse myself in the beginning for my bad english. I got assignment to draw a scheme of circuit in Xilinx on Spartan 3 FPGA board, that would write a word on 4 7-segment display , and it needs to blink every 2 seconds. The word is "radi" which means "IT WORKS". Well, i wrote binary code for each leather: "R",
Hi everyone, I am designing an incremental A/D converter in Cadence, which needs a counter to count the number of pulses (it has to be an up/down counter). Is there an ideal model for such a counter in Cadence or will I have to draw a schematic of a counter and then simulate my circuit? Thanks.
Hello, I need to make a frequency counter accurate to the Hz. I have made a quite accurate OCXO on 10.7mhz, but the frequency counter schematic I have found on the net uses a 4MHz crystal. So I need a divider to divide down the 10.7mhz to 4mhz, since I do not know how to alter the code.
Here is my recent project using is pretty simple and useful for Arduino beginners. 83767 Single Digit Decimal counter using Arduino You cam find the schematic and code in my Electronics blog -
Hello, I'm playing with Up/Down counters since past few days trying to get a counter that changes its operation after reaching min/max. I want my counter to go like 0,1,2,3,.....,13,14,15 and then 14,13,12,...,3,2,1,0 and then again 0,1,2,3.. and carry on this way with a clock pulse. I tried doing this using a J-K flip flop but it (...)
A single 4017 IC (one of ten counter) driven by a slow clock, can operate one light. It's too easy to do it that way of course. Are you only allowed to use gates? Nevertheless the 4017 method can give you ideas how to clarify steps in the project flowchart. - - - Updated
HI for all can somone give me a clear schemtatic about this counter and its oscillator (555, RC ,....). thanx
I have designed a 5bit asynchronous counter using T-flip flops. The T-flip-flops have a asynchronous reset and it is working fine.But when i am reseting the the counter then all the 5 outputs of the counter are not going to zero only the lsb is going to zero and other remain sometimes at logic 1 or logic 0. I am not able to reset the (...)
i recently acquired an intermittently working LEADER LDC 824 frequency counter in a deal that is hard to resist (reads from 10hz to 520mhz) sometimes it works (reads frequency) after 20mins warmup, sometimes after an hour other times it wouldn't work even after 2hours warmup time. Also at times it works even when the set is cold then suddenly st
I don't see how the logic shown in the schematic should work. Known SAR designs are using two FFs per output bit, see e.g. At least, you need a state counter that selects the output bit to be set in the actual compare in addition to the output registers. Special SAR architectures like charge redistribu
Hi, Initial value for variable counter in main program should be set to 0. ie. counter=0; . Tq.
x band frequency counter schematic, using some kind of prescaler possibly Have you found any such schematic from the internet? I cannot find any
which the required length input from the customer is taken and that input must be displayed on the LCD and also it should be given in the microcontroller for future calculation... Frequency counter using AT89C2051 and LCD (Assembly) : 8
I recently purchased the TTL Cookbook by Don Lancaster, and it gives clues into how a simple frequency counter could be built from TTL. Does anyone know of a circuit that would be reasonably easy to build? It's not for anything serious, just something that I thought could be a fun project to use my Numitrons as a display other than another cl
i am trying to set the ADC output manually i am giving clock with 7474 asynchronous counter but output of ADC is high always i m sending the schematic i have assembled also plz give suggestions for clock circuit.62659
we design a pulse counter circuit in pic16f877a.sensor is npn or pnp.also this sensor operating voltage i need perfect isolation circuit using opto coupler and driving circuit for pulse to the input of pic.anybody give me the circuit?
choose some uc with timer interval counter like aduc it provides a independent time counter, so that you can count the pulses uninterruptedly.
I need Pulse counter schematic, which count data from LED / LDR pulse.If you have please help.
Hi all, i'm new to this forum! For many reasons (Which i'm not listing here...) i need to make a Geiger counter, but i've nearly no experience in this brand of electronics, so i'm asking to you some support. I've already bought the Geiger tube: an LND 712 basically, i need a circuit to extract a di
I found tube from Geiger BOB33. To avoid thought it to the garbage, I decided to build tool for it. Very useful was internet and some projects from the web. I didn’t make diagram so don’t look for it. Principle of w
hi. Please help me. I just built a LED matix circuit(attatched schematic below) with 16f84A and CD4022 counter. I tested some example hex files for movnig sign and I am not satisfied with the output because of an automatic reset which is unwanted. I dont know how to remove this.... What exact happen is that if the code of output is "HELLO" by ass
hello guys, i am working on a visitor counter using microcontroller, i am done with the code and tested it in proteus, but i got a problem with the ir link,, here i hav to establish a link such that any person passing through the door will obstruct the link and i am going to have a trigger, i am trying photodiodes and IR leds, but i can't get
Given this circuit, answer these questions; 1- what is it? 2- How does it work? 3- If clock freq. is increased, which flop fails 1st and why? my guess is: down ring counter, counts from 7 down to zero and repeats, at high freq., the fastest flop meaning F1 fails 1st..... what do you think.
I am looking for a schematic to build a prototype circuit. The circuit is a twelve channel sequential pulse counter. Each channel should have: A. Positive and Negative screw output connector B. Variable output (Miliwatts) between 1mw and as high as possible. C. LED to show what channel is active D. On and off switch to disable that step if re
hi everyone, I was required to build a stop watch that would count up to 60 and then go back to 0 and start counting again. Also i had to make 2 switches one for the start/stop button another for the reset button. I have completed both the mod 60 and the start and stop button and it is working in multisim. I cant seem to get the reset button to wo
Hi, Ive designed something and have very big problem. In ISE Synthesis finished without errors and warnings but when I viewed RTL schematic there is one component not connected to others. I tried some combinations but nothing helps. From this unconnected component, counter, I wanted use output value twice, so CNT_VAL was assigned to CNT_VAL_LO
Hello, I am posting two On Picture 1. is the JFET driving PNP BJT through voltage drop on R1 - this is common circuit how I found on internet by many similar variants. On Picture 2. is the same JFET, but driving
can anyone have an idea how to make a 0-99 counter using ic's and the displa is the LEDs?pls help
Hello everyone, I made a counter with 3 sectional of the schematic in attachments.On schematic is another pic, and I use the 16f76, 4MHz oscilator.Display with common cathode. In the Basic, I got the written code and tried to adjust it to end,but i do not now how and i ask for help! The counter is conceived to work like (...)
can u help me? I have a problem with digital design as following: "build a 8 bit up/down counter with I/O: clk, set, reset, data_in, data_out. use VHDL language, build the testbench to emulate and verify this counter." thanks alot!
for those who are interested to realize frequency counters i submit here the schematic and firmware for the one i made 2 months ago The frequency counter is based on PIC 16F628A and the 7-segment display is realized with MAX 7219
Hi, I'll try to get the circuit board again to see the smd markings. I just wanted to make a simple and cheap heart beat real time counter. I can always do with opamps, but even with them I can't get a clear signal from the noise and the circuit gets a bit big. Thanks for the help. I'll make some tests with the transistors. :)
Hi all, I need pls a service manual/or schematic for my newer Philips counter, PM6614. Best thanks in advance. Karesz