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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
Do we need to assume ourselves that you have used 555 timer ic in astable mode and you have used BCD counter and the 7 segment display to display the timervalue?
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.
Constant display of 3000 RPM seems to indicate 50 Hz hum but no tachometer signal at the counter input. Looks like a hardware problem.
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.