All Questions
9
questions
0
votes
1
answer
164
views
74f269 counter getting very hot
Hi I'm a DIY enthusiast and I got stuck with the circuit that I designed.
The counter is getting very hot from the moment It's powered up.
In my setup the 330Ohm resistors at the outputs are ...
- 21
0
votes
1
answer
575
views
How to transition multiple down counters using a 74LS193 in a 'one at a time' sequence
I'm trying to create a sequence of down counters, so that when the first completes, the next starts, and so on until the last one, then repeat.
I thought it would just be a case of adding a flip-flop ...
- 11
0
votes
1
answer
38
views
How can I output to one of 4 different outputs without using a demultiplexer?
I do not have a demultiplexer available, so I need a substitute. I have a TTL signal and I need to output the signal to output 1, then output 2, then output 3, then output 4 in sequence, meaning that ...
- 155
0
votes
2
answers
14k
views
8-bit binary to BCD decoding for three 7-segment displays
I've created a circuit that uses both binary and BCD counters to convert an 8-bit binary number into three BCD numbers, which then feed into BCD to 7-segment decoder chips, and finally to common-anode ...
- 269
1
vote
3
answers
251
views
Multiple Demultiplexers In Series
Basically I need some demultiplexers to switch between 24 outputs. The data inputs would be connected to counters for the addresses. I'm currently using 74ls138 3-8 line demultiplexers. Is this ...
- 11
2
votes
3
answers
1k
views
Understanding Test Parameters on Datasheet (CL pF)
On Page 7 of the datasheet for M74HC590
It uses a CL (pF)
At the bottom of Page 8 is the test circuit which shows where the CL(pF) goes, in regards to a circuit diagram, but I don't understand that ...
- 260
0
votes
2
answers
1k
views
74LS163 Counter Exhibits Constant Voltage on an Input Pin
I built a circuit that uses the 74LS163 synchronous counter. I am using in such a way that I reset the counter, using the /clear input pin, externally via and LPF connected to a tactile switch.
The ...
- 3,461
0
votes
3
answers
1k
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 ...
1
vote
1
answer
4k
views
Creating a one-digit scoreboard using logic circuits
I'm creating a one-digit scoreboard on a breadboard. Naturally, I have a BCD to 7-segment decoder and a 7-segment display. But I don't know how to automatically increment the display. (It's for a game,...
- 113