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1answer
79 views

Cascade shift registers driven by single-cycle microcontroller

I'm trying to make a unit in which 4 digits can be updated in a small amount of time from a single-cycle microcontroller (preferably all digits updated within 5uS) My circuit is setup in the ...
0
votes
2answers
86 views

Maximum Clock Input Frequency Datasheet Confusion

I was looking for an 8-bit parallel to serial shift register to use in a project I am making. Initially, I thought that the 4021 would work perfectly for what I need, however, after looking at the ...
0
votes
3answers
230 views

Simplest shift register test circuit - clock

I'm looking for the simplest way to test the operation of a 74HC595 shift register without complex circuitry. Currently (on a breadboard) I have a 47K SIP resistor in a pull-up fashion connected to ...
-2
votes
1answer
899 views

VHDL Knight Rider

I am newbie in VHDL. In my code, everything seems right but code doesn't work properly. I couldn't find where my fault is. Any solutions? ...
0
votes
4answers
345 views

Preventing integrated circuits from receiving/causing EMI

I have two almost-identical circuits: Before continuing, I want to point out that I used three sets of jumpers for making logic selections to some of the pins. I know the better approach would be to ...
0
votes
2answers
445 views

Simplest way to produce a lagging pulse (latch trigger) after receiving another pulse (clock trigger)?

I am teaching myself how to use a 74HC595 shift register, and am fairly new to proper digital circuit design. I ran into a question. I am using a simple circuit involving a few LEDs, a switch for ...
1
vote
1answer
682 views

Shift registers, understanding parallel-in serial-out

I have the 74hc597 parallel-in serial-out (PISO) shift register. The datasheet can be found here. I have a general idea about how serial-in shift registers (SIPO) work, but I'm having trouble ...
2
votes
1answer
226 views

How can two separate devices send clock data to a shift register IC?

I'm using a microcontroller to clock a byte into a 74HC595 shift register and latch it. It then sends a signal to the other device which send 8 clock pulses when it is ready to receive the byte. So ...
0
votes
2answers
3k views

What are the functions of the ULN2003A and HCF4094 within this circuit?

We are building a wordclock and want to know what the following components do within the circuit: ULN2003A driver IC HCF4094 shift register This is the schematic:
2
votes
1answer
650 views

Using the same clock for multiple shift register

Sorry for the beginner question. I'm working on a nixie tube clock and I have a bunch of shift registers for each tube. Do I need to use a different clock for each IC or can I use the same clock for ...
3
votes
2answers
3k 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 self-correcting....
1
vote
1answer
633 views

Shift register with the Raspberry Pi

I have recently bought some 74HC595N (datasheet) shift registers to play with using my Raspberry Pi. The Raspberry Pi has a general purpose clock that I think I should be able to make use of, however ...
0
votes
1answer
646 views

Adding 4-bit numbers to 16-bit shift register

I am trying to find a way to add four 4-bit binary numbers to a 16-bit shift register, one(group of 4 bits) by one. This way I can store 4 decimal numbers(0-9) in the register, adding them by pushing ...
1
vote
2answers
2k views

Digital Clock Circuit

I am making a solid wood clock using minimal components. So far, I thought of using 21 LEDs to make 7 segment displays (3 LEDs for each segment (overall 63 LEDs for the displays)), 6 LEDs for the 1 in ...